Musical Fidelity, well regarded as Hi-fi, added new equipment back in the days (that technically would contaminate the signal) in an attempt to increase audio listening pleasure. This was a tube stage that connects before amplification, and I think most folks know about this. My type of questions always get called effects devices and ignored or told to be moved to instruments and PA
My system is getting assembled, according to the details further below from my thread in the class D area to discuss the amp boards and power supplies. I need some direction with the tubes, some peer reviews and suggestions would be very highly appreciated
I am about to start ordering some online kits and boards that are tube based. I think I need one setup to provide channel tubyness and I have the desire to have one or two aux channels that have a tube based preamp and tone on them that are switchable to take them out of the circuit
Tubyness
I have selected this device for channel tubyness, may be able to get away with 3 units to flavour my 5.1 channels independently. I won’t be using the .1 output of the decoder, instead the signal will be routed in the decoder to the main L and R speakers. I hope to use the unit flavouring FL and FR as the system headphone output too and the signal out from this lil amp with have a low passed signal for system subwoofer
SIngle ended tube triode amplifier for hifi 6N5P 6N5C Headphone amplifier class A (will order 1 after posting this)
Aux channel preamp
This one looks interesting. I have 8 of these tubes on hand, and they are nice golden NOS Russians. I am going to order this board too and see if there is a way to increase gain and to mod to a tone unit too
6N3 Preamplifier Circuit Board
This one is also attractive, but I'll only have the tube that comes with the kit
- Is this a better option?
TR2 6DJ8 ECC88 E88CC 6922 Tube Buffer Pre-amplifier
The following is from another thread in the class D area and provides the background into what I am doing. Eventually, the hope is that I would have played with lots of gear and upgrades
I am actively putting together two systems:
System 1 - 5.1 for our home which serves as home cinema and home studio and used for studio tasks usually about once a week. This is an open plan type home that contains the kitchen and adults bedding in one room. Another same sized room is attached, with an amenities' room separating the two. A full length room run alongside the two main rooms and serves as my workshop, large double sliding doors from main room to workshop. These areas are contained in a square house structure
System 2 - 2.1 mobile box with 3 aux amplifier channels outputs, for a portable setup, which can supply extra amplification on demand with extra speakers. This will be installed in the workshop in a manner that allows easy removal. Mainly for listening to music while I am working, as well as for testing stuff without having to rip into the home system (I hope the logic for common device models is now apparent)
Request
The living room is not a place for a PA system, neither is the sound quality and ability of most of this sized PA systems out there for portable use acceptable. System 1 will be in operation here virtually 24/7. Think of these as being in the same category as the high-end Japanese audiophile disc players that feature mic inputs. I do not believe that anyone would be upset about such a disc player being discussed in a Hi-fi forum, so please may I request that discussion on an amplifier with the same feature doesn't upset anyone's sensibilities
Please regard these as a Hi-fi want to be setup. Both will be used for audio and video reproduction and appreciation and when liquid courage hits the spot, these systems should invite one to grab something and let loose
Desired feature:
This thread is for the tube devices that will be contained within
I have been saving for this project for a while, and in the meantime pouring over catalogues and specs and pestering folks with uneducated questions and ideas. Time to get to work on these, so I have ordered these items:
Signal IO
This unit will get fitted inside the amplifier case and provide most of the signal IO and act as the brains and system overall volume (has remote) as well as individual channel adjustment
4K@60Hz HDMI 2.0 Audio Extractor Converter DTS AC3 5.1CH Digital Audio Decoder ARC SPDIF Coaxial PC-USB Bluetooth Audio Input
Amplification
To be trailed as the low frequency amp
AIYIMA 500Wx2 Digital Power Amplifier (PSU on the board) x 1
To be trailed as the main channels amp and low frequency amp
HIFI Power IRS2092 500W Mono channel Digital power amplifier x 5
+ Lusya Dual DC 36V Output LLC Soft Switch 500W Switching Power Supply x 1
To be trailed as the main channels amp and bench amp
TDA7492 Amp Class D High-Power Digital Amplifier Board 2x50W (to run in bridge mode as a mono amp) x 1
+ 24V switching power supply board 4A 100W x 1
Speaker drivers
Low frequency
Dayton Audio RSS265HO-44 10" Reference Series HO DVC (delivered) x 1
Main channels
Already have a number of various pairs of bookshelf types on hand. Working on an interesting 6" coaxial speaker alongside this project, I am using some very interesting sounding drivers that I auditioned and bought, but I fear derision on my choice here
Reason to post thread
I am getting some promising looking kit that might help me acquired the desired sound system. Please guys, help me with peer review of my choices and suggestions to gear that I may not have noticed. I know create folks out there will have some great ideas too. Please help with mod suggestions as well as education pointers in anything I may be lacking. This will also be a log for me to help keep track of my project
Thanks and regards
Randy
My system is getting assembled, according to the details further below from my thread in the class D area to discuss the amp boards and power supplies. I need some direction with the tubes, some peer reviews and suggestions would be very highly appreciated
I am about to start ordering some online kits and boards that are tube based. I think I need one setup to provide channel tubyness and I have the desire to have one or two aux channels that have a tube based preamp and tone on them that are switchable to take them out of the circuit
Tubyness
I have selected this device for channel tubyness, may be able to get away with 3 units to flavour my 5.1 channels independently. I won’t be using the .1 output of the decoder, instead the signal will be routed in the decoder to the main L and R speakers. I hope to use the unit flavouring FL and FR as the system headphone output too and the signal out from this lil amp with have a low passed signal for system subwoofer
- Am I heading in the right direction with this board?
- How does it work without output transformers?
- Are there any output transformers that may enhance the task that I am asking of these?
- Are input transformers with this of any merit?
- Is it ok to run the headphone output into the input of the class d boards?
- I would like to run a switching power supply instead of a "ring cow". Is this ok to do with this design? Should I take out the regulator stuff out of this board if I find a switching supply?
SIngle ended tube triode amplifier for hifi 6N5P 6N5C Headphone amplifier class A (will order 1 after posting this)
Aux channel preamp
This one looks interesting. I have 8 of these tubes on hand, and they are nice golden NOS Russians. I am going to order this board too and see if there is a way to increase gain and to mod to a tone unit too
- Am I heading in the right direction with this board?
- How does it work without output transformers?
- Are there any output transformers that may enhance the task that I am asking of these?
- Are input transformers with this of any merit?
- Is it ok to run the output of this into the input of the tube headphone board?
- I would like to run a switching power supply instead of a "ring cow". Is this ok to do with this design? Should I take out the regulator stuff out of this board if I find a switching supply?
6N3 Preamplifier Circuit Board
This one is also attractive, but I'll only have the tube that comes with the kit
- Is this a better option?
TR2 6DJ8 ECC88 E88CC 6922 Tube Buffer Pre-amplifier
The following is from another thread in the class D area and provides the background into what I am doing. Eventually, the hope is that I would have played with lots of gear and upgrades
I am actively putting together two systems:
System 1 - 5.1 for our home which serves as home cinema and home studio and used for studio tasks usually about once a week. This is an open plan type home that contains the kitchen and adults bedding in one room. Another same sized room is attached, with an amenities' room separating the two. A full length room run alongside the two main rooms and serves as my workshop, large double sliding doors from main room to workshop. These areas are contained in a square house structure
System 2 - 2.1 mobile box with 3 aux amplifier channels outputs, for a portable setup, which can supply extra amplification on demand with extra speakers. This will be installed in the workshop in a manner that allows easy removal. Mainly for listening to music while I am working, as well as for testing stuff without having to rip into the home system (I hope the logic for common device models is now apparent)
Request
The living room is not a place for a PA system, neither is the sound quality and ability of most of this sized PA systems out there for portable use acceptable. System 1 will be in operation here virtually 24/7. Think of these as being in the same category as the high-end Japanese audiophile disc players that feature mic inputs. I do not believe that anyone would be upset about such a disc player being discussed in a Hi-fi forum, so please may I request that discussion on an amplifier with the same feature doesn't upset anyone's sensibilities
Please regard these as a Hi-fi want to be setup. Both will be used for audio and video reproduction and appreciation and when liquid courage hits the spot, these systems should invite one to grab something and let loose
Desired feature:
- An ability to keep electronic hardware and speaker driver models common to both systems
- Emphasis is on quality quite nighttime sound reproduction and ample headroom without loosing composure for other times
- Switch power supplies (desire to stay away from "ring cows")
- Tubey audio signature (prefer the sound of the 300b amp for audio)
- Engineered with the ability to input a live performer or two on demand (In other words, beautiful reproduction of prerecorded material, containing the "studio to mastering" process internally for a seamless jamalong)
- Low pass channels to be either about; 400 clean watts into 8 ohms - 400 clean watts into 2 ohms - 2 x 200 clean watts into 4 ohms each
- High pass channels to be about 100 watts clean into 4 ohms
This thread is for the tube devices that will be contained within
I have been saving for this project for a while, and in the meantime pouring over catalogues and specs and pestering folks with uneducated questions and ideas. Time to get to work on these, so I have ordered these items:
Signal IO
This unit will get fitted inside the amplifier case and provide most of the signal IO and act as the brains and system overall volume (has remote) as well as individual channel adjustment
4K@60Hz HDMI 2.0 Audio Extractor Converter DTS AC3 5.1CH Digital Audio Decoder ARC SPDIF Coaxial PC-USB Bluetooth Audio Input
Amplification
To be trailed as the low frequency amp
AIYIMA 500Wx2 Digital Power Amplifier (PSU on the board) x 1
To be trailed as the main channels amp and low frequency amp
HIFI Power IRS2092 500W Mono channel Digital power amplifier x 5
+ Lusya Dual DC 36V Output LLC Soft Switch 500W Switching Power Supply x 1
To be trailed as the main channels amp and bench amp
TDA7492 Amp Class D High-Power Digital Amplifier Board 2x50W (to run in bridge mode as a mono amp) x 1
+ 24V switching power supply board 4A 100W x 1
Speaker drivers
Low frequency
Dayton Audio RSS265HO-44 10" Reference Series HO DVC (delivered) x 1
Main channels
Already have a number of various pairs of bookshelf types on hand. Working on an interesting 6" coaxial speaker alongside this project, I am using some very interesting sounding drivers that I auditioned and bought, but I fear derision on my choice here
Reason to post thread
I am getting some promising looking kit that might help me acquired the desired sound system. Please guys, help me with peer review of my choices and suggestions to gear that I may not have noticed. I know create folks out there will have some great ideas too. Please help with mod suggestions as well as education pointers in anything I may be lacking. This will also be a log for me to help keep track of my project
Thanks and regards
Randy
I made an uninformed choice and ordered the headphone amp that I linked above. I hope I can make it work to my purpose
Some assistance with if I am headed in the right direction would have been appreciated, but what can one do but ask for help and wait in vain that some enthusiast would show interest chime in with some informed input
Some assistance with if I am headed in the right direction would have been appreciated, but what can one do but ask for help and wait in vain that some enthusiast would show interest chime in with some informed input
6N5P is Chinese version of 6AS7G, so some tube rolling is possible.
6N3 is Chinese version of 5670 or 2C51
6n3 tone board
I have this coming in too. I will attempt to run the bass guitar through this into the above headphone amp. I am curious to see what will happen if I cascade one channel of the tone board into the other via a pot before sending to the headphone amp. Also, curious to plug in the mic into this
The objective with this is to have a circuit to blend in a live jammer into the everyday playlists. Like Japanese audiophile Hi-fi that have "mic inputs"!
I have this coming in too. I will attempt to run the bass guitar through this into the above headphone amp. I am curious to see what will happen if I cascade one channel of the tone board into the other via a pot before sending to the headphone amp. Also, curious to plug in the mic into this
The objective with this is to have a circuit to blend in a live jammer into the everyday playlists. Like Japanese audiophile Hi-fi that have "mic inputs"!
Been asked why Hi-fi tube boards for the live channels. Hmm, I have tried to play the bass through all sorts of amps, including tube amps and various effects units. Just doesn't blend in with a song playing back through the Hi-fi system. My experiments with removing the passive circuitry in the bass and feeding the pickups directly to solid state pres and eq then mixing into the stereo playback track live gives that perfect blend. The bass and mics fit right in. Only thing missing is a need I feel to round off the peaks on my thumb playing that only the big Ampegs can do. I want to experiment with a hi-fi tube pre to see if I can get that soft clipping thing happening straight from the pickups, then mixed back through the headphone amp into the stereo channel. The sub filter is going to be after the headphone amp. Does this make sense?
I tried to make my shopping list based on this
Reading Tube Amp Schematics
The tone board schematic seemed to reflect this to my uneducated eyes. The tone filter section also seemed reasonable. The 5670 tube also seems highly recommended as having better frequency response
Below is the other schematic I have been looking at for trying to find similar things in shopping
5670 (2C51) Bass preamplifier
Again, this one seems similar to the tone board. The cathode bypass are fitted. There is an extra pot for midrange
I had been hoping to find similar boards online and hopefully mod them to the performance of these two examples
I thot I was onto a good thing, didn't realise how far off I was! Thing is that the pre sections of Ampeg and fender seem based on the same layout, and the 12Axxx tubes are being called inferior to the 5670s on the Engel page.... I am a bit lost
Anyway, I have that tone board and headphone amp coming in. I have some awesome 5670s in stock too. Just now created a mouser account to get some reputable components and using the Engel schematic and the Ali boards, I should somehow be able to fit a Hi-fi live-in or two
Reading Tube Amp Schematics
The tone board schematic seemed to reflect this to my uneducated eyes. The tone filter section also seemed reasonable. The 5670 tube also seems highly recommended as having better frequency response
Below is the other schematic I have been looking at for trying to find similar things in shopping
5670 (2C51) Bass preamplifier
Again, this one seems similar to the tone board. The cathode bypass are fitted. There is an extra pot for midrange
I had been hoping to find similar boards online and hopefully mod them to the performance of these two examples
I thot I was onto a good thing, didn't realise how far off I was! Thing is that the pre sections of Ampeg and fender seem based on the same layout, and the 12Axxx tubes are being called inferior to the 5670s on the Engel page.... I am a bit lost
Anyway, I have that tone board and headphone amp coming in. I have some awesome 5670s in stock too. Just now created a mouser account to get some reputable components and using the Engel schematic and the Ali boards, I should somehow be able to fit a Hi-fi live-in or two
I think you need to stop and first plot the gain steps you need. That way you can pick the best amp for the job.
Instrument gain stages differ from amp.
Instrument gain stages differ from amp.
Apologies for such long posts, thank you all for your time to go through this:
That's the thing, I think I have but appears that I am unable to successfully explain the system to attract assistance
Let's look at this project. It's all about small form factor/high power 5.1 integrated amplifier with aux two channel live inputs
So this is my experiment:
A class d based 5.1 power amplifier stage with ample headroom for anything we do at home and speakers to match. This is required anyway tubes or no tubes
My only digital source is the laptop, soon to be upgraded to Mac. The little decoder seems like a quality way to add HT receiver abilities to above class d amps. This is required anyway tubes or no tubes
I have the speaker drivers, so that's the HT sorted. I have a taste for tubyness in my audio, so let's add a miniscule single ended triode pre-power amp and pick up its output and add it to the main stereo input of the above setup. That's the job that the headphone amp and the Pass H2 will be experimented and AB'd then added to the system
Again so far seems totally reasonable to me
We like to occasionally jam along with some of the playback material, spur of the moment thing. Then, just like vintage home tube hi-fi and Japanese hi-fi, let's add a live input worthy of the rest of the setup. Bass that sounds like recorded material, vocals, guitars, whatever takes our fancy. I have taken a very good look at what it takes to create the type of bass sound signatures that I enjoy, and I would have to have this Ampeg in the video linked below DI'ed and mic'ed into the above system. Not dragging that into the living room. No one seems to get this
LEROY SIBBLES (Heptones) & JOHN HOLT ft LLOYD PARKS & We The People Band live
So how do I go about creating a musician's home integrated hi-fi amplifier? The centrepiece of our home audiovisual setup? I took a long look at the guts of the Ampeg, then tried to find a way to emulate that sound in a smaller package that does not require an additional mic'ing step to mix back in, just plug and play. The 5670/6n3 seems to be a good choice to me for the gain it can produce and what it can do to the audio (or promise to as I haven't tested this setup yet)
I have some good quality components coming in now. Enough to build 3 of those Engel 5670 bass pre type circuits. I have 8 very nice 5670 tubes as well as the tubes on the boards already ordered. Now I am reading online educational material on tubes. Looks like I will be able to use some inspiration from this schematic and draw up in LTspice something that suits my exact purpose, with you guy's help of course to point out any newbie mistakes
I am easily able to use MAD, it's like CAD but instead of computer aided design, this is based on 'mind' aided design!!! I am able to either with a visual or dimensions, hold complex shapes in mind, work on it and tune it and with my hands create it to fine detail. Whether it's assembling a structure or carving it out. With a Laser CNC router and 3D printer on order, I feel I have a printer for my imagination now!!! I intend to add screen printing, vinyl cutting and large format laser cutting to that (that's for my RC model craft and to fit out my hire boats). I can see the small form factor integrated amp in my mind with the glowing tubes, gold highlights and knobware, fabric/timber/steel chassis, proper colour coded knobware on the live inputs, rows of glowing tubes (looks like there will be around 8 tubes)
I am very excited about this project. It's finally happening. I do have a proven track record of sticking to long term projects and doing them well. No one's time here will be wasted with constructive input and criticism along this project, I'll promise that
We mainly listen to music videos, usually something 60s/70s/80s dub, dancehall or Bollywood 40s to current. Most tracks have pretty well-developed bass lines (not just bass guitars but any and all bassy instruments) where the bass is seemingly playing the riddim in a melodic way and is a prominent instrument
Thanks and regards
Randy
That's the thing, I think I have but appears that I am unable to successfully explain the system to attract assistance
Let's look at this project. It's all about small form factor/high power 5.1 integrated amplifier with aux two channel live inputs
So this is my experiment:
A class d based 5.1 power amplifier stage with ample headroom for anything we do at home and speakers to match. This is required anyway tubes or no tubes
My only digital source is the laptop, soon to be upgraded to Mac. The little decoder seems like a quality way to add HT receiver abilities to above class d amps. This is required anyway tubes or no tubes
I have the speaker drivers, so that's the HT sorted. I have a taste for tubyness in my audio, so let's add a miniscule single ended triode pre-power amp and pick up its output and add it to the main stereo input of the above setup. That's the job that the headphone amp and the Pass H2 will be experimented and AB'd then added to the system
Again so far seems totally reasonable to me
We like to occasionally jam along with some of the playback material, spur of the moment thing. Then, just like vintage home tube hi-fi and Japanese hi-fi, let's add a live input worthy of the rest of the setup. Bass that sounds like recorded material, vocals, guitars, whatever takes our fancy. I have taken a very good look at what it takes to create the type of bass sound signatures that I enjoy, and I would have to have this Ampeg in the video linked below DI'ed and mic'ed into the above system. Not dragging that into the living room. No one seems to get this
LEROY SIBBLES (Heptones) & JOHN HOLT ft LLOYD PARKS & We The People Band live
So how do I go about creating a musician's home integrated hi-fi amplifier? The centrepiece of our home audiovisual setup? I took a long look at the guts of the Ampeg, then tried to find a way to emulate that sound in a smaller package that does not require an additional mic'ing step to mix back in, just plug and play. The 5670/6n3 seems to be a good choice to me for the gain it can produce and what it can do to the audio (or promise to as I haven't tested this setup yet)
I have some good quality components coming in now. Enough to build 3 of those Engel 5670 bass pre type circuits. I have 8 very nice 5670 tubes as well as the tubes on the boards already ordered. Now I am reading online educational material on tubes. Looks like I will be able to use some inspiration from this schematic and draw up in LTspice something that suits my exact purpose, with you guy's help of course to point out any newbie mistakes
I am easily able to use MAD, it's like CAD but instead of computer aided design, this is based on 'mind' aided design!!! I am able to either with a visual or dimensions, hold complex shapes in mind, work on it and tune it and with my hands create it to fine detail. Whether it's assembling a structure or carving it out. With a Laser CNC router and 3D printer on order, I feel I have a printer for my imagination now!!! I intend to add screen printing, vinyl cutting and large format laser cutting to that (that's for my RC model craft and to fit out my hire boats). I can see the small form factor integrated amp in my mind with the glowing tubes, gold highlights and knobware, fabric/timber/steel chassis, proper colour coded knobware on the live inputs, rows of glowing tubes (looks like there will be around 8 tubes)
I am very excited about this project. It's finally happening. I do have a proven track record of sticking to long term projects and doing them well. No one's time here will be wasted with constructive input and criticism along this project, I'll promise that
We mainly listen to music videos, usually something 60s/70s/80s dub, dancehall or Bollywood 40s to current. Most tracks have pretty well-developed bass lines (not just bass guitars but any and all bassy instruments) where the bass is seemingly playing the riddim in a melodic way and is a prominent instrument
Thanks and regards
Randy
I can't find them on aliexpress anymore, but there's other places out there online that seem to carry it.
https://www.aliexpress.com/item/325...st.0.0.373e1802baVcmf&gatewayAdapt=4itemAdapt
I have a couple of those, I drew out the schematic in LTspice and it's almost identical to the Rob Robinette schematic you posted above. I like it's sound but I keep meaning to maybe refine it in some way but I am a tube novice.
https://www.aliexpress.com/item/325...st.0.0.373e1802baVcmf&gatewayAdapt=4itemAdapt
I have a couple of those, I drew out the schematic in LTspice and it's almost identical to the Rob Robinette schematic you posted above. I like it's sound but I keep meaning to maybe refine it in some way but I am a tube novice.
Interesting, am glad it has a nice sound. That looks a lot like this board
5670 (6N3) single tube dual channel preamplifier board
What do you use yours for? Recorded music or instrument pre?
At a glance I would say that it appears to be the same board with different component values. I use it for music listening, I have a whole bunch of 6DJ8/6922 family tubes and it's nice to add some tube flavor to the sound.
Looks like this board is used with a bunch of similar tubes. What refienements did you consider, maybe of use to me?
Overall I have a good amount of the 6DJ8/6922, 5670/2C51, and 6CG7's, but none are matched pairs. I thought perhaps (here's where I stress my level of novice) the component values and input voltage could be tuned to make a good use of all of those tubes on one board. Maybe a bit larger of a board to fit some fancy film capacitors.
Drawing it up in LTSpice and learning a little, I found the LG-156 buffer is an inverting circuit. Poking around as to whether or not I could transform it into a non-inverting circuit (if that even matters?), I came across https://www.tubecad.com/2019/03/blog0459.htm Further down that page in the compound buffers section there's a schematic that does just that, I drew it up in LTSpice, sim's run lower distortion but back to my lack of tube knowledge, I really don't know if it's a good or bad idea to consider it.
Drawing it up in LTSpice and learning a little, I found the LG-156 buffer is an inverting circuit. Poking around as to whether or not I could transform it into a non-inverting circuit (if that even matters?), I came across https://www.tubecad.com/2019/03/blog0459.htm Further down that page in the compound buffers section there's a schematic that does just that, I drew it up in LTSpice, sim's run lower distortion but back to my lack of tube knowledge, I really don't know if it's a good or bad idea to consider it.
Could be worth a play just to see how it goes. I ordered some vishay, nichion and wima components from mouser too. I am having one difficulty that I believe you may be able to help me with. I am having difficulty enabling 5670 in ltspice
I found this below but can't seem to use it. Could you please share with me your model and how you made that appear in spice, I would be very grateful
*
.PARAM X1=-0.044770209 X2=0.032175849 X3=-2.2476294
.PARAM X4=0.40025303 X5=18.639663 X6=3.7476294
.PARAM X7=0.0040093865 X8=46.569699 X9=0.0099503146
.PARAM Y1=0.0020046932 Y2=0.0021345255
BK IK 0 V=U(V(G,K)+X1)X7*URAMP(V(G,K)+X1+URAMP(V(A,K))/X8)^1.5+(1-U(V(G,K)+X1))*X9(X2*URAMP(V(A,K)))^X3*(X4*URAMP(V(G,K)+X1+URAMP(V(A,K))/X5))^X6
BA A K I=URAMP((Y2*URAMP(V(A,K))^1.5)-URAMP((Y2*URAMP(V(A,K))^1.5)-V(IK)+Y1*URAMP(V(G,K))^1.5*(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+.4)))+1E-10*V(A,K)
BG G K I=Y1*URAMP(V(G,K))^1.5*(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+.4)
* CAPS
CGA G A 1.1p
CGK G K 2.2p
CAK A K 0.1p
.ENDS
I found this below but can't seem to use it. Could you please share with me your model and how you made that appear in spice, I would be very grateful
*
- Generic triode model: 5670_AN
- Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
- Version 3.10, Generated on Wed Nov 29 08:47:18 2017
- Anode
- | Grid
- | | Cathode
- | | |
.PARAM X1=-0.044770209 X2=0.032175849 X3=-2.2476294
.PARAM X4=0.40025303 X5=18.639663 X6=3.7476294
.PARAM X7=0.0040093865 X8=46.569699 X9=0.0099503146
.PARAM Y1=0.0020046932 Y2=0.0021345255
BK IK 0 V=U(V(G,K)+X1)X7*URAMP(V(G,K)+X1+URAMP(V(A,K))/X8)^1.5+(1-U(V(G,K)+X1))*X9(X2*URAMP(V(A,K)))^X3*(X4*URAMP(V(G,K)+X1+URAMP(V(A,K))/X5))^X6
BA A K I=URAMP((Y2*URAMP(V(A,K))^1.5)-URAMP((Y2*URAMP(V(A,K))^1.5)-V(IK)+Y1*URAMP(V(G,K))^1.5*(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+.4)))+1E-10*V(A,K)
BG G K I=Y1*URAMP(V(G,K))^1.5*(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+.4)
* CAPS
CGA G A 1.1p
CGK G K 2.2p
CAK A K 0.1p
.ENDS
I found a file called triodes.sub somewhere, probably this forum, I attached it in case you want it. I placed that file in the \my documents\LTSpiceXVII\sub\ folder. I believe I manually added the 6922.Phi4 valve in the file following the format of all the other valves within it.
*edit - did some thinking - probably came from here - https://www.diyaudio.com/community/threads/vacuum-tube-spice-models.243950/
Then you add a spice directive that would say ".include triodes.sub" (no quotes)
Next you will hold ctrl and right click your valve symbol, change the prefix to "X" (no quotes). and the value in your case looks like it would be "5670_AN" (no quotes).
The actual 6922.Phi4 blurb from within the attached file is..
*edit - did some thinking - probably came from here - https://www.diyaudio.com/community/threads/vacuum-tube-spice-models.243950/
Then you add a spice directive that would say ".include triodes.sub" (no quotes)
Next you will hold ctrl and right click your valve symbol, change the prefix to "X" (no quotes). and the value in your case looks like it would be "5670_AN" (no quotes).
The actual 6922.Phi4 blurb from within the attached file is..
That looks clever, but I would recommend LTSpice XVII for your simulating, although adding in models and such can be a bit of a learning curve (I'm still learning myself) it's worth it. Check out this thread, https://www.diyaudio.com/community/...ding-ltxvii-from-beginner-to-advanced.260627/
For layouts, PCB's, etc, I would recommend KiCAD 6. Open source, widely used, it'll be the tool you'd use from schematic to PCB layout to producing gerbers for a PCB house. I find it really intuitive and easy to use, very easy to find answers with a quick google.
For layouts, PCB's, etc, I would recommend KiCAD 6. Open source, widely used, it'll be the tool you'd use from schematic to PCB layout to producing gerbers for a PCB house. I find it really intuitive and easy to use, very easy to find answers with a quick google.
In DIYaudio the onus is on you to do the work. It’s more likely people ask specific questions and demonstrate what thwy have done rather than people do the work for your requirements. It took me a while to understand and for me to learn steps. People will attempt to help if they have time.
I’d recommend looking at the ltapice sticky thread in the software tools sub forum. Lots of models for LTspice (Forum search helps find tube models and operating points previous discussed).
KiCad works well for pcb layout, although another learning curve. Annoyingly it can’t import from ltapice (well i have never managed it!).
Step 1 - work out the iiput and output (peak voltages, current required to drive the loaf etc). For line level you need to understand the impedances of the load etc
Step 2 - convert that to a gain, adding any feedback gain required in total.
Step 3 - you will find as you you will then need to break that down if high gain is required as one tube will not do the entire thing (output the tubes require drivers)
You may then need to parallel tubes (OTL) or use a specific output transformer to get the drive requires.
This should match impedances to prevent frequency roll off or creating distortion.
The architecture you have then has certain requirements - such as current and B+ voltages to operate at the desired operating point (load lines etc).
At this point you should have an ideal schematic gor the signal path.
Step 4 - at this point I would build the thing and use a generic HV bench power supply. Not everything will behave as planned so make adjustments. Then plan out the options for iron/switch PSU with and regulation required.
At this point you have a operating amp on a board - be it a wood/metal “breadboard” or a kit PCB.
Step 5 - power and other components (volume etc). This is just as compex if not more complex than the previous steps. It may require tweaking of the previous steps. Custom power changes to smps are not simple (especially resonant tank designs). It’s easy to burn power off to reduce voltage but that in turn sucks power from the supply. More Resistance with current = more noise.
I’d recommend looking at the ltapice sticky thread in the software tools sub forum. Lots of models for LTspice (Forum search helps find tube models and operating points previous discussed).
KiCad works well for pcb layout, although another learning curve. Annoyingly it can’t import from ltapice (well i have never managed it!).
Step 1 - work out the iiput and output (peak voltages, current required to drive the loaf etc). For line level you need to understand the impedances of the load etc
Step 2 - convert that to a gain, adding any feedback gain required in total.
Step 3 - you will find as you you will then need to break that down if high gain is required as one tube will not do the entire thing (output the tubes require drivers)
You may then need to parallel tubes (OTL) or use a specific output transformer to get the drive requires.
This should match impedances to prevent frequency roll off or creating distortion.
The architecture you have then has certain requirements - such as current and B+ voltages to operate at the desired operating point (load lines etc).
At this point you should have an ideal schematic gor the signal path.
Step 4 - at this point I would build the thing and use a generic HV bench power supply. Not everything will behave as planned so make adjustments. Then plan out the options for iron/switch PSU with and regulation required.
At this point you have a operating amp on a board - be it a wood/metal “breadboard” or a kit PCB.
Step 5 - power and other components (volume etc). This is just as compex if not more complex than the previous steps. It may require tweaking of the previous steps. Custom power changes to smps are not simple (especially resonant tank designs). It’s easy to burn power off to reduce voltage but that in turn sucks power from the supply. More Resistance with current = more noise.
