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GainWire mk3 CFA pre/phone amp with very low distortion
GainWire mk3 CFA pre/phone amp with very low distortion
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Old 13th September 2016, 07:07 PM   #21
xrk971 is offline xrk971  United States
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GainWire mk3 CFA pre/phone amp with very low distortion
If it is a stereo board with PSU as shown below, then I am in for 1 board.

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Old 13th September 2016, 08:09 PM   #22
platon.rado is offline platon.rado  Slovakia
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Yes...but balanced..or no ???And JFET and a differential stage???...J-fet sound is better.
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Old 13th September 2016, 08:33 PM   #23
dadod is offline dadod  Croatia
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Quote:
Originally Posted by platon.rado View Post
Yes...but balanced..or no ???And JFET and a differential stage???...J-fet sound is better.
Jfets are only in the shunt regulators, the amp part is all BJT, take a look at the schematic in the first post and the shunt schematic here. Shunt regulator +-15V
I don't think that type of semiconductor defines the sound but the way how the amp is designed.

Last edited by dadod; 13th September 2016 at 08:35 PM.
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Old 13th September 2016, 09:25 PM   #24
platon.rado is offline platon.rado  Slovakia
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Yes it's true.But j-fef is better.Especially at heights...

OK...and you can not change it ???Q11,12 If you do not mind...BJT is good.
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Old 14th September 2016, 02:37 AM   #25
reaper996 is offline reaper996  United States
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Not to parrot xrk971, I am in for a board.
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Old 14th September 2016, 03:04 AM   #26
didiet78 is offline didiet78  Indonesia
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Any different with mk2?
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Old 14th September 2016, 06:13 AM   #27
dadod is offline dadod  Croatia
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Quote:
Originally Posted by platon.rado View Post
Yes it's true.But j-fef is better.Especially at heights...

OK...and you can not change it ???Q11,12 If you do not mind...BJT is good.
It is true that is simpler to use jfets and John Curl(he has hundreds jfets on his disposition) use them in his almost always the same input stage. If you think it is better I would not argue with you. Now it is not easy to buy complementary jfets and to get matched, and not any more in production, lot of fakes there.
You can find a link to my first GainWire using jfets in post #8.
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Old 14th September 2016, 06:26 AM   #28
dadod is offline dadod  Croatia
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Quote:
Originally Posted by didiet78 View Post
Any different with mk2?
Mk2 works in two modes, NGNFB and CFA, mk3 works in CFA only and thus needs less compromises(higher OLG and better compensation). It has lower distortion and because output buffer run at 100 mA(there two BC5xx in parallel) can drive low impedance headphones with very low distortion too.
There almost is no distortion when drives line or high impedance phones.
It uses PCB ground plane too.
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Old 14th September 2016, 06:35 AM   #29
dadod is offline dadod  Croatia
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Here is the list for full two channels board, I will take two for me. Please edit the list if there more interested, two more to be 10 then I can order.

dadod------------2
platon.rado ----- 2
mlloyd1--------- 2
xrk971-----------1
reaper996--------1
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Old 14th September 2016, 06:40 AM   #30
arthur is offline arthur
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GainWire mk3 CFA pre/phone amp with very low distortion
Here is the list for full two channels board, I will take two for me. Please edit the list if there more interested, two more to be 10 then I can order.

dadod------------2
platon.rado ----- 2
mlloyd1--------- 2
xrk971-----------1
reaper996--------1
Arthur-----------2
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