Need 396A/6N3P/2C51/407A spice model - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th August 2006, 03:41 AM   #11
mach1 is offline mach1  Australia
diyAudio Member
 
mach1's Avatar
 
Join Date: Sep 2004
Location: Brisvegas
phn,

the 1k 'gridstopper' is not a gridstopper at all as it is on the output cathode. Ultrasonic ringing on the output can be a problem with transformer coupled linestages that can be addressed by loading, but is not usually an issue with regular RC coupling. The gridstoppers shown on the Broskie circuit should tame any tendency towards RF misbehaviour.

I fail to see how the 100k 'pulldown resistor' could promote a more constant current draw, as all DC is effectively blocked from flowing through it by the 5uF output capacitor. The Broskie circuit, however, has been carefully designed to achieve this outcome under dynamic conditions by balancing the ratio of the resistors used to bias V1 with those for V2. If you check you will find that the sum of the resistance for V2 = approx 0.9 that for V1 (as far as the power supply is concerned V1 and V2 are in antiphase, and the 0.9 ratio adjusts for the cathode follower gain of 0.9)

If you use a 1M output resistor the input impedance of your power amp will be the primary determinant of the impedance the preamp sees, and (unless the power amp input impedance is quite low) you will therefore be able to use a smaller coupling cap.

Having said all this, If I were in your place I would probably go for the aikido which is a later and probably more effective design.

Arnold, the diode in the circuit fulfils a protective role only and has nothing to do with the performance of the linestage. Unfortunately, the link to the circuit no longer exists, so everthing I have stated here is from memory.


pm
  Reply With Quote
Old 13th August 2006, 05:51 AM   #12
arnoldc is offline arnoldc  Philippines
diyAudio Member
 
Join Date: Apr 2003
Location: Makati
Send a message via Yahoo to arnoldc
thanks mach1 and robert

phn, goodluck on your project. I was hoping to see more 407A projects here as they're really cheap!
  Reply With Quote
Old 13th August 2006, 02:39 PM   #13
phn is offline phn  Sweden
diyAudio Member
 
phn's Avatar
 
Join Date: Oct 2004
Robert, I use B2 Spice Lite. I found it more intuitive (read simple) to use than the others I tried. But these models will probably do anyway. These are problems I think I can solve, as well as allow me to, hopefully, learn something. I assume most models around are not designed for B2 Spice anyway. Thanks for the models.

pm, I just fell in love with the 407A. I'm not really a fan of preamps. I prefer passive/transformer pre/line stages, meaning basically a volume pot. But they have their problems. I might go Aikido later. I'm still scouting.

Grid stopper? I'm learning, I'm learning.

arnoldc, Thanks. It would have been nice with a 407A tread here like the one on the 12B4.
  Reply With Quote
Old 14th August 2006, 01:42 AM   #14
arnoldc is offline arnoldc  Philippines
diyAudio Member
 
Join Date: Apr 2003
Location: Makati
Send a message via Yahoo to arnoldc
Quote:
arnoldc, Thanks. It would have been nice with a 407A tread here like the one on the 12B4.
let's make this one

I'll post my simple 407A (and cousins) schema once I get my non-work related USB drive connected on my notebook.
  Reply With Quote
Old 14th August 2006, 01:21 PM   #15
diyAudio Member
 
bogdan_borko's Avatar
 
Join Date: Nov 2005
Location: serbia, zajecar
I have a pair of russian 6N3P tubes and I`d like to use them in the line stage...
Anyone knows are these tubes used in audio and where. I tried a simple (RC) stage and they sounded cold and chrisp...

any schematics?
cheers!
  Reply With Quote
Old 14th August 2006, 02:11 PM   #16
diyAudio Member
 
Join Date: Feb 2004
Location: Dzerzhinsk
PSpice models for Russian tubes are here:

http://www.next-power.net/next-tube/ru/libs.php3

(file PSlib.zip)
  Reply With Quote
Old 14th August 2006, 02:21 PM   #17
diyAudio Member
 
Join Date: Feb 2004
Location: Dzerzhinsk
"I have a pair of russian 6N3P tubes and I`d like to use them in the line stage...
Anyone knows are these tubes used in audio and where. I tried a simple (RC) stage and they sounded cold and chrisp...
any schematics?"

It is very good tube for DAC output, MM phono preamps, etc:

http://astral-for.narod.ru/index/tubes/riaa_fr.gif

http://www.metaleater.narod.ru/45.zip

http://64.233.183.104/search?q=cache...=clnk&cd=1</a>

http://www.tubecad.com/email_2001/e0829/page20.html
  Reply With Quote
Old 15th August 2006, 02:06 AM   #18
arnoldc is offline arnoldc  Philippines
diyAudio Member
 
Join Date: Apr 2003
Location: Makati
Send a message via Yahoo to arnoldc
I haven't tried the 6N3P yet, but since you have it in prototype already, try 160V anode voltage and 9mA. 2V - 4V bias to suit your taste.

How are you operating it right now?

My friend just finished his 407A pre and told me his 26 pre beats it in openness, but the 407A pre beats the 26 pre in bass (tighter) and highs (cleaner). He's running his at 11mA.
  Reply With Quote
Old 15th August 2006, 05:55 AM   #19
arnoldc is offline arnoldc  Philippines
diyAudio Member
 
Join Date: Apr 2003
Location: Makati
Send a message via Yahoo to arnoldc
phn, mach1,

my friend emailed me his 407A circuit which he finished last night.

he comments that,

1. "this is very likeable"
2. "when the led current was around 7ma it was a bit edgy but now at around 11mA its smooth"
3. "B+ around 165 i think if i use 5V4 around 175"
4. "1.9V" (when I asked for the bias voltage)
5. "but like this better than the (snipped) specially on vocals"
6. "(snipped, censored) bass!!" when I asked him what is the strongest character.
7. but he goes on to say, "deep musical but for me its great for vocals"

I asked him, compared to your 26?

1. "the 26 more airy. but the 407 is not lean ha."
2. "mids can fill up the whole room. mid highs are snappy. without being hard"
3. "overall i would say its better than my 26 by a hair. maybe if i try the 01A or the UX-112"
Attached Images
File Type: jpg 407a plate choke.jpg (29.6 KB, 555 views)
  Reply With Quote
Old 16th August 2006, 04:10 AM   #20
mach1 is offline mach1  Australia
diyAudio Member
 
mach1's Avatar
 
Join Date: Sep 2004
Location: Brisvegas
Thanks Arnold,

I think a new 407A thread might be needed shortly !

pm
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Settings for testing 2C51/5670/396A on B&K Model 600 Dyna Quik luvdunhill Tubes / Valves 0 11th October 2008 05:48 PM
Help With 6v6 Spice Model porcatroya Tubes / Valves 0 5th May 2008 07:41 AM
Would a 396A or 2C51 drive a 45? DHT112A Tubes / Valves 2 29th August 2007 12:42 AM
Two matched pair USA made, NIB & NOS 2C51 = 396A tubes for sale cartman Swap Meet 0 23rd December 2006 10:24 AM
SPICE model Prune Parts 6 16th October 2004 04:22 PM


New To Site? Need Help?

All times are GMT. The time now is 02:52 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2