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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: Question re 6BX7GT in 300B push pull designs posted by David Loader on July 21, 2016 at 15:07:28:
Your concern is well founded. I have such amps, albite PPP KT-120 output stage, and finding 6BX7s with sections matched for bias current (required) in a differential gain stage will be problematic (fortunately I have a goodly stash of them). If you do build these beasts, I would suggest that you consider using CCS fed shunt regs for the input and driver stage B+. For the 6SN7 cathode CCS I would suggest using a cascode BJT current sink a la Morgen Jones. For the output stage use a Fairchild power MOSFET/TL431 cathode CCS. These changes from the original circuit have increased my enjoyment of these amps.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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Follow Ups
- RE: Question re 6BX7GT in 300B push pull designs - JKT 07/21/1615:24:53 07/21/16 (1)
- RE: Question re 6BX7GT in 300B push pull designs - Boli46 22:18:48 07/21/16 (0)
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