I think I know what Jetbat is referencing.....
Some people call this a Cathode Coupled circuit. They claim that the cathode of V1a is "driving" the cathode of V1b, which then makes the behavior of V1b look a lot like a grounded grid stage (AKA Common Grid). Not saying this is right.......
Roscoe Primrose wrote:
Jetbat wrote:
Isn't V1B a common grid stage? Or does that change with the grid tied to the R8-R9 junction?
Scott
No, it's a standard common cathode stage. Input is the grid, output from the plate. The connection of R2 to the junction of R4 & R7 just provides a DC feedback to keep the bias current in the output tubes more stable (as does the R1/R3/R6 combo).
Roscoe
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