Metropoulos Forum

Hopefully, this is an easy question...

Regarding the bias circuit of a JTM45/100...can someone confirm that:

-The bias splitter resistors are 220K
-The bias supply dropping resistor is 150K
-The bias pot is 25K linear
-The bias resistor in line with the bias pot is 47K
???

The reason why I ask is because I've seen other values here and there, in particular with the bias resistor and pot...so wanted to see if someone can confirm.

Thanks
Rip

the 47k and 150k varies slightly. The important thing to remember is to bias the tubes correctly

Thank you

Seems like I'll try the nominal valves...I'll be back if I need to tweak it

Thanks
Rip