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In Reply to: Am I reading the schematic correctly? posted by xaudiomanx@aol.com on December 15, 2008 at 05:50:12:
"I didn't see any cathode resistor except for the 235 ohm with a 50UF cap. I don't see the 165 and 54 ohm resistor."
The schematic only shows one channel. One channel has a 235 ohm cathode resistor. The other channel has the 12ax7 filament as part of the cathode resistor. The 12ax7 is heated with the current of the output tubes of one channel.
"On the plate of the 6SN7 there seems to be a 28750 ohm resistor? Am I reading that correctly. I don't think I ever saw that value. Other than that this seems to be a standard Williamson circuit. "
It's not a Williamson circuit. It's a Mullard. The reason one plate resistor is smaller (28750 ohms vs. 33000 ohms)is to try to balance that cathode coupled phase inverter.
Tre'
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- RE: Am I reading the schematic correctly? - Tre' 12/15/0809:38:49 12/15/08 (0)
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