MRF455 Bias voltage

[N6ADA]

Hello all, I'm working on an amp with MRF455 transistors. Would someone happen to know what the bias voltage should be for these? I'm reading -12v on the base keyed or unkeyed. This doesn't seem correct, but I'm not sure.

Thanks

 

[Tallman]

If I had enough information, amp brand, model number, or a schematic I could be more helpful. Unkeyed the voltage should be ZERO volts. I am hoping that your voltage reading of -12v you just have your leads reversed. If you have -12v and you do not have the test leads reversed then maybe you have reversed your power supply.

 

[sp5it]

Current, not voltage. 80-100mA is OK.
Mike

 

[Tallman]

The posting read as follows: I'm reading -12v on the base keyed or unkeyed.
Last I heard V means voltage.
You are correct about the quiescent currents at 80 to100 ma idle current.

 

[N6ADA]

Thanks guys. Sorry, after posting this I figured it out. Yes for class AB approximately .6 volts but adjust for correct current as mentioned. I was trying to figure out how to delete this thread
Thanks again!