Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.
RE: Importance of Phase Splitter/Driver Balance?
Posted by Palustris on May 20, 2009 at 10:16:24:
I don't have the schematic for any cj amps handy, but generally I believe the cj amps use a long tailed pair to affect the phase splitting while still offering some gain to the stage. The second tube that is driven by its cathode would have a variable resistor in the plate circuit so that the out of phase voltages (not the currents) match in level. So, yes, you would have to perform this balance operation as the tubes age or if they are changed.