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Old 7th January 2013, 05:08 PM   #3391
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Ooops, my fault didn't read that. But definately there was something in the air. Whose obsolete and extremely expensive transistors are a bit teasing, so one can thing of something instead.
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Old 7th January 2013, 05:22 PM   #3392
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Poor Man's F6 , made with any of usual (enhancement mode) suspects (IRFP , FQ, 2S) will bring enough of buff-IST-wakoo out magic
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Old 7th January 2013, 06:50 PM   #3393
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Just to clarify you doubt or confirm ?
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Old 7th January 2013, 07:20 PM   #3394
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when I'm in doubt , you'll always see at least triple more dumb smilies included in post

triple - comparing to usual number of dumb smilies in my posts

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Old 7th January 2013, 07:24 PM   #3395
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Quote:
Originally Posted by Zen Mod View Post
Poor Man's F6 , made with any of usual (enhancement mode) suspects (IRFP , FQ, 2S) will bring enough of buff-IST-wakoo out magic
Done it with IRF's. Just need a few BLUE Leds, .5 or so source resistors, and your ready to roll. I think it sounds good.
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Old 7th January 2013, 08:10 PM   #3396
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Aren t blue leds noisy? Perhaps a single zener might give better results?
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Old 7th January 2013, 08:13 PM   #3397
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The F6 with IR parts works fine - you need to degenerate the parts with
0.47 ohms or so (maybe a little more) for thermal stability, and you will
find that there is higher harmonic distortion. Typically an IRFP240 will come
in with about twice the THD figure, but as the overall amplifier also has a
distortion contribution from the transformer, you will not see a doubling of
distortion in the overall amplifier.

The primary value of the SS Jfets are less thd and thermal drift, but you can
get along fine with other parts.

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Old 7th January 2013, 08:20 PM   #3398
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Quote:
Originally Posted by dimkasta View Post
Aren t blue leds noisy? Perhaps a single zener might give better results?
don't believe in everything you read on the web

for instance , don't believe in what I just wrote

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Old 7th January 2013, 11:05 PM   #3399
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Quote:
Originally Posted by Nelson Pass View Post
The primary value of the SS Jfets are less thd and thermal drift, but you can
get along fine with other parts.
I guess we ll just have to wait for some more feedback and see how this "getting along" translates into audible differences...
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Old 7th January 2013, 11:11 PM   #3400
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Beats FQA and IRF in my personal opinion. Also tried laterals, which i like, of course.
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