Similar question - I was planning to transport the current to the grid of the tube in the buffer and convert it right there - grid to the negative of the heater ???
Seems also a mistake?
Thanks,
Thank you John and JH for the precious hints,
I'm plan to beginn with normal carbons but don't want also to limit myself as I love experiment around sound impacts with layout and passive parts ( a sort of hobby near the main hobby). So I plan also to test a double wirewound à la Rhopoint or Mills.
Thanks for the smt resistor ref, I will test it also and give up the expensive Vishay...
I'm plan to beginn with normal carbons but don't want also to limit myself as I love experiment around sound impacts with layout and passive parts ( a sort of hobby near the main hobby). So I plan also to test a double wirewound à la Rhopoint or Mills.
Thanks for the smt resistor ref, I will test it also and give up the expensive Vishay...
I tried a variety of high end commercial resistors and then wound my own manganin resistor at 58R with bifilar winding. Very good sound. Have not tried the Rhopoint due to cost, or parallel (cool idea). Parallel Manganin... now there's an idea!
🙂 // resistors are also very usefull for economic Pi filter : you just need to keep some little space between the body of the // resistor for better air heat cooling. Some terrosrist of sound to adjust sound signature mix carbon & metal... it was before DSP, electronic filters...
John maid also beautifull hand wired resistor if you remember on the beginning of this thread...
John maid also beautifull hand wired resistor if you remember on the beginning of this thread...
I did quite a few power resistors using the paralleled Manganin (mainly with the 9R/metre wire) - 8 strands tightly press into those hollow IC sockets for easier construction - sounded just the same as the Isabellenhutte PBH ones - didn't overheat even with 1.5A thru them and hasn't changed value in use
Multiple parallel Isotan (Konstantan) doesn't quite sound the same as those power versions of the 'naked Vishays', unfortunately (Texas Component TX220, or Vishay VPR220) - could have been the soldered connection of the strands tho ... 'Alazira' has some 50R ones for sale in the Vendors section, otherwise a crazy price!
'maxlorenz' also did some of those fancy wound handmade resistors of John's with good success - I did a couple and decided that it'd be better for my sanity to just buy the finished resistors from Farnell's, despite the cost!
Multiple parallel Isotan (Konstantan) doesn't quite sound the same as those power versions of the 'naked Vishays', unfortunately (Texas Component TX220, or Vishay VPR220) - could have been the soldered connection of the strands tho ... 'Alazira' has some 50R ones for sale in the Vendors section, otherwise a crazy price!
'maxlorenz' also did some of those fancy wound handmade resistors of John's with good success - I did a couple and decided that it'd be better for my sanity to just buy the finished resistors from Farnell's, despite the cost!
Yes, thank you dear. 🙂
And I plan to build honeycomb power resistors with my 1 Ohm/m OCC copper wire for my future single ended Class A Semisouth power FET amp project. 😎
I expect OCC copper wire to be cleaner than manganin...
These homemade Moebius resistors are transparency personified.
Cheers,
M.
PS: I bet John could make good use of Semisouth's power FETs for his ciclotron power amps!
Hi Mauricio, good to hear from you - hope things are still going well
I tried doing some low value resistors from that pure copper wire but have trouble handling the super fine stuff - I was tempted to get a couple of those valve copper resistors from Dave Slagle ....
Are any of those Power Fets still available?
I tried doing some low value resistors from that pure copper wire but have trouble handling the super fine stuff - I was tempted to get a couple of those valve copper resistors from Dave Slagle ....
Are any of those Power Fets still available?
As promised, the list of interest is started.
http://www.diyaudio.com/forums/digi...-jitter-crystal-oscillator-4.html#post4057057
I aim for 8 Ohm for Class A and 0.25 Ohm for BJT push pull output R. No problem I foresee...
I believe our mate Semisouthfan may (but I could be wrong) still have some:
http://www.diyaudio.com/forums/pass-labs/229241-semisouth-boiler-room-19.html
Cheers,
M.
PS: still planning to build the upgraded active XO with polystyrene caps for my new speakers...
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Will ask and see if any still available - missed the boat with those!
Doing some 0.8R Manganin's for the F5 - might also try some of that OCC for those too in #24 enamel 2 in parallel and play with those honeycomb 'thingies' again
The 1541A is now producing such clear & clean bass (Sen with Rhopoint I'V) that having to upgrade to B2 bass box (sealed) with a new version of the 15" Lorantz bass driver - trying out one of those Behringer Ultra-Drive Pro Active Cross-Over things just for bass <125Hz as very flexible and sound quite okay in the bass - simple B1 12dB filter above 125 HP without any BSC.
I'm still amazed at the sound we can get from these old 1541A dac chips - I've now got an Ayre Acoustic QB-9 usb dac and the Phillips maynot be quite as fast, etc but is more musical and on some music, quite preferable.
Sorry guys for all the OT stuff.
Doing some 0.8R Manganin's for the F5 - might also try some of that OCC for those too in #24 enamel 2 in parallel and play with those honeycomb 'thingies' again
The 1541A is now producing such clear & clean bass (Sen with Rhopoint I'V) that having to upgrade to B2 bass box (sealed) with a new version of the 15" Lorantz bass driver - trying out one of those Behringer Ultra-Drive Pro Active Cross-Over things just for bass <125Hz as very flexible and sound quite okay in the bass - simple B1 12dB filter above 125 HP without any BSC.
I'm still amazed at the sound we can get from these old 1541A dac chips - I've now got an Ayre Acoustic QB-9 usb dac and the Phillips maynot be quite as fast, etc but is more musical and on some music, quite preferable.
Sorry guys for all the OT stuff.
do you really need to pollute every thread with your commercial offer? I encountered at least 6 threads where you wrote this same message in the last 24 hours with a product which is of no interest for anyone anyway ...
Please, read post #36, this is not a commercial offer, exactly the opposite.
In all threads I posted the link I did talk about the custom crystal and the oscillator in the past, so, since now the project is ready, I would inform who was interested.
rhopoint resistors has also been recommended to me by thorsten loesch. I think the are worth it!
Hi Ceglar,
Both Econister and the more compact (and more expensive) Squaristor have similar specs (check datasheets). The squaristor is intended for saving board space.
Both Econister and the more compact (and more expensive) Squaristor have similar specs (check datasheets). The squaristor is intended for saving board space.
Hi Shane and thanks John for the input,
Shane, I believe the Rhopoint Econistor radial 5 serie is less big than the 8 serie for the same performance. The wattage difference has no importance here for our i/V problematic.
After many readings : Second best choice could be a bulk foil resitor for i/v but not the famous Vishays which are said to perform better if used in the audio signal path ... especially the VAR Z foil. Peter the famous man of the GainClone is for a Cadock for him TDA1543 DAC ( Cadock MK132V ???) after tried the Vishays but notice he had no tried the Rhopoint which are said to be both very transparent ("clear" or "resolution" is the word in english ?) and smooth (not bright but with no loss of resolution). Oliver 3 wings aka the BARON ROUGE DAC pcbs kit father which has a very good tube outputstage iirc prefere also the Rhopoint after a proof of concept : Vishays TR275 (aka naked bare exhibitionist Z foil) was given up !
If you need a diferent architecture like a carbon comp resistor for another app than I/V like your tube outputstage or in the signal path for the particular high fhz filter performance with DACS : AMG Amtrans is said to worth it, better than the Shinkoh carbon, tantalum of all brands even AUDIO (salted) NOTE (note= "bill" also in french!). The second best choice with carbon composite resistors is the famous ALLEN BRADLEY, first choice with the price, also with its japanese equivalent ARCOL : PR9372 metal films, Amtrans carbon film,Audio Note,Shinkoh,TKD correctohm, Pathaudio resistors, Charcroft,Takman,Arcol,Mills,Takman,Holco,Allen Bradley,duelund resistor,Kiwame carbon film,M-resist supreme,Caddock MK132V Precision Thick Film Resistors
Shane, I believe the Rhopoint Econistor radial 5 serie is less big than the 8 serie for the same performance. The wattage difference has no importance here for our i/V problematic.
After many readings : Second best choice could be a bulk foil resitor for i/v but not the famous Vishays which are said to perform better if used in the audio signal path ... especially the VAR Z foil. Peter the famous man of the GainClone is for a Cadock for him TDA1543 DAC ( Cadock MK132V ???) after tried the Vishays but notice he had no tried the Rhopoint which are said to be both very transparent ("clear" or "resolution" is the word in english ?) and smooth (not bright but with no loss of resolution). Oliver 3 wings aka the BARON ROUGE DAC pcbs kit father which has a very good tube outputstage iirc prefere also the Rhopoint after a proof of concept : Vishays TR275 (aka naked bare exhibitionist Z foil) was given up !
If you need a diferent architecture like a carbon comp resistor for another app than I/V like your tube outputstage or in the signal path for the particular high fhz filter performance with DACS : AMG Amtrans is said to worth it, better than the Shinkoh carbon, tantalum of all brands even AUDIO (salted) NOTE (note= "bill" also in french!). The second best choice with carbon composite resistors is the famous ALLEN BRADLEY, first choice with the price, also with its japanese equivalent ARCOL : PR9372 metal films, Amtrans carbon film,Audio Note,Shinkoh,TKD correctohm, Pathaudio resistors, Charcroft,Takman,Arcol,Mills,Takman,Holco,Allen Bradley,duelund resistor,Kiwame carbon film,M-resist supreme,Caddock MK132V Precision Thick Film Resistors
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Got it : Peter Daniel found the Caddock TF020 give good result but not the MK132. Z foil are too bright according to him : testimonial is about I/V with a TDA1543 : http://www.diyaudio.com/forums/parts/64538-resistor-sound-quality-8.html#post759233
Well if no Rhopoint in the tool box, maybe Caddock TF020 worth a try (better than the Charcroft Z foil here !)...
Sorry John to highjack a little here. Find myself it goes in the sense of your philosophy about choosing the best parts in relation to the needs on the layout.
Well if no Rhopoint in the tool box, maybe Caddock TF020 worth a try (better than the Charcroft Z foil here !)...
Sorry John to highjack a little here. Find myself it goes in the sense of your philosophy about choosing the best parts in relation to the needs on the layout.
Thanks John, and Eldam.
I am interested in the Rhopoints, but I wonder how much difference the lead length at RF will matter - inductive at RF, and with fixture from tube pin to signal common centre spigot, the smaller type would have lead length <1mm, the other, body permitting, would not.
FWIW, in all its subjectiveness ... tried all in 2W Allen Bradley, Riken Ohm, Shinkoh Tantalums and then mk132 and naked vishays. Preferred the tantalums but its a matter of choice. The only one I wouldn't use again is the mk 132, the others vary from warm fuzz to clean bright.. with the tantalum about middle of the road. I'm not sure you can have it all, but wont stop me from trying..
Any indications that the Rhopoints will offer more than just a different tonal perspective?.. only hint I've had at that is the tantalums which are a bit like the carbon types but with more detail and HF, but not bright like the other two bulk foil types.
Shane
I am interested in the Rhopoints, but I wonder how much difference the lead length at RF will matter - inductive at RF, and with fixture from tube pin to signal common centre spigot, the smaller type would have lead length <1mm, the other, body permitting, would not.
FWIW, in all its subjectiveness ... tried all in 2W Allen Bradley, Riken Ohm, Shinkoh Tantalums and then mk132 and naked vishays. Preferred the tantalums but its a matter of choice. The only one I wouldn't use again is the mk 132, the others vary from warm fuzz to clean bright.. with the tantalum about middle of the road. I'm not sure you can have it all, but wont stop me from trying..
Any indications that the Rhopoints will offer more than just a different tonal perspective?.. only hint I've had at that is the tantalums which are a bit like the carbon types but with more detail and HF, but not bright like the other two bulk foil types.
Shane
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Maybe the Rhopoint Miniohms are good as well? The availability on Ebay makes them easy to try.