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In Reply to: RE: 6B4G Single End amp in a new suit ? posted by Triode_Kingdom on April 03, 2017 at 12:44:31
Isn't the B+ across the 6B4g supposed to be 250vdc? Using a 10 ohm resistor drops the entire B+ across the tube and at 50ma,he is at full dissipation for that tube.If it was setup for fixed bias,he could control the current at least when using a 10 ohm cathode resistor.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
Some people uses 250V across the 6B4G (and often 60mA Idle current). This would give 15W Plate disipation. However, the OPTs often used is 2500 ohm load.
In this case the Lundahl OPT is a 3000 ohm making the designer to chose a slightly higer voltage. And to stay with the 15W dispation, the Idle current caused of that decreased to 50mA.
The 10 ohm resistor at the 6B4G cathode is just for measure purposes.
50mA current through it drops 0,5V which is negligable in this case.
You are good.I actually run a pair of my Fisher 100 amps which are identical to the 80AZ amps that take EL37s.I had built an outboard supply for separate filament transformers biased with a 1.2k 10 watt cathode resistor.It is actually running at 290v across each tube but these amps sound incredible and I'm making 16 watts output per amp.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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