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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Bias source from B+ or seperate trans, which is better? posted by Lee of Omaha on August 8, 2014 at 10:21:49:
Lee,
What you write seems reasonable to me, but I was specifically told to do fixed bias with a separate PT and a FWB by an audiophile tenured EE Professor, a genius. No EE got through his class until they built a successful sounding tube amp !! This E.E. PhD. was in charge of USA's early NASA project of putting a monkey into space.They were using an EARLY version of Jeremy Epstein's DC 2A3 amp circuit. To calm the mammal, in the capsule, they installed WE 755s, played Bach and Beethoven, using an amplifier that was intially called "Monkey on a Rocket ".
Seriously, there are all kinds of high frequency nasties in the modulating HV secondary, and I could underdstand intuitively - a separate PT for fixed bias would be better. Rather than..."that will do" designing. The EE Professor was specific about this !!
Jeff Medwin
Edits: 08/08/14 08/08/14
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Follow Ups
- RE: Bias source from B+ or seperate trans, which is better? - drlowmu 17:15:34 08/08/14 (3)
- Another dead professor! - gusser 10:30:04 08/11/14 (0)
- RE: Bias source from B+ or seperate trans, which is better? - rage 07:44:12 08/11/14 (0)
- Interesting comments - unclestu 18:19:03 08/09/14 (0)
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