Re: New PP amp...
Posted: November 17th, 2014, 4:57 pm
Ok. That's where I was confused.
Thanks
Scott
Thanks
Scott
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
FerdinandII wrote:I think I know what Jetbat is referencing.....
Some people call this a Cathode Coupled circuit. They claim that the cathode of Via id "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.......