My dad and I had just started working on a vacuum tube audio amplifier when he passed away three years ago. He was an EE. I'm not. I'm just now getting back to it and am going from some of our sketchy notes. I'm having trouble with the attached circuit.
It looks to me like the plates of the 12AX7 would see 480 volts which is considerably higher that they're rated. Unless: do the R4/R6 and R5/R7 pairs act as voltage dividers whose values would allow one to select the plate voltage for the tube?
Also, can someone point me to a good regulator circuit for the bias supply?
I know this is real basic stuff for most of you; thanks for your help.
Everett
It looks to me like the plates of the 12AX7 would see 480 volts which is considerably higher that they're rated. Unless: do the R4/R6 and R5/R7 pairs act as voltage dividers whose values would allow one to select the plate voltage for the tube?
Also, can someone point me to a good regulator circuit for the bias supply?
I know this is real basic stuff for most of you; thanks for your help.
Everett