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Old 21st July 2013, 09:27 AM   #13241
Corpius is offline Corpius  Netherlands
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Most probably asked before, but is it OK to use just one transformer / power supply for two channels?
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Old 21st July 2013, 10:06 AM   #13242
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yes it is.
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Old 24th July 2013, 02:26 PM   #13243
tonimxp is offline tonimxp  Italy
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Default How to obtain more warm sound

This is the Papa's Way

"Alternatively, you can increase the value of the Source resistors to 1 ohms,
and increase the value of the feedback resistors from 2 X 100 ohms and 10
ohms to 1 X 100 ohms and 22 ohms.

The lower amount of feedback will warm the sound up, and you can keep
increasing proportional values in the feedback loop if you wish".

Please about Source resistor values is there a correlation with the power out or not?

If yes how it change?

Antonio
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Old 25th July 2013, 02:39 AM   #13244
SY is offline SY  United States
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I've removed links and associated discussion of sales of unauthorized knock-offs using stolen IP. If anyone reposts them, they will be put in read-only mode for an extended period- or perhaps permanently.
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Old 25th July 2013, 02:57 AM   #13245
6L6 is offline 6L6  United States
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Good call.
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Old 25th July 2013, 03:55 AM   #13246
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Maybe mods should make a permanent announcement about knock-offs?
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Old 25th July 2013, 09:16 AM   #13247
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Dr. Yay Not Too Early. (sir)
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Old 27th July 2013, 08:20 AM   #13248
superR is offline superR  Netherlands
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This question has been asked many times, but since I am having trouble sourcing the 2sk and 2sj's, I am looking for substitutes.

I have read that J175 and J111 should be accepted replacements, but I want to verify.
The same holds for the ZTX's. I can only source ZTX651 and ZTX751.

Are these part ok to use without reducing the performance "greatly"?
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Old 27th July 2013, 10:30 AM   #13249
Marra is offline Marra  United Kingdom
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Have you tried Spencer.
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Old 27th July 2013, 12:57 PM   #13250
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Quote:
Originally Posted by superR View Post
This question has been asked many times, but since I am having trouble sourcing the 2sk and 2sj's, I am looking for substitutes.

I have read that J175 and J111 should be accepted replacements, but I want to verify.
The same holds for the ZTX's. I can only source ZTX651 and ZTX751.

Are these part ok to use without reducing the performance "greatly"?
LSK170 is a direct substitute for 2SK170 and is in current production. BF862 is an RF N-Channel device, surface mount and in production. 2N5457, 2N5460 are around from time to time -- they are old parts often with the identification painted rather than lasered or silked onto the body -- pinout is a bit different and gm a lot lower, so you have to match. There are surface mount versions of these in current production.
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