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In Reply to: RE: 101D Schematic modifications posted by iodemus on September 21, 2014 at 22:03:37
You asked :
(1) Simplify, get rid of the series coupling cap, and direct couple the the two audio stages.
(2) Avoid a C input filter, puts spikes on B+. I like best of all .... L1/C1/L2/C2. Ls 20 Ohms or less in DCR, prefer under 10 Ohms.
Jeff Medwin
Follow Ups:
Hello Jeff,
1. It would have been fine to skip the coupling cap, but what are the consequences?
I don't want to destroy the tubes and OPT's.
How to make protection circuit?
2. Partially L input filter, only a very small C to get the B+ on the mark.
30 ohms each choke, the best I had.
Johnny
A properly designed direct-coupled two-stage amp is hugely bulletproof. Start to study Loftin-White iterations on line.
Usually B+ to the Finals is 450-500 VDC which most output tubes and transformers can take. I can send you information if you email me .
Jeff Medwin
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