JCM800 50 watt lead series/bias adjust

[tubefrk]

Hi, please forgive my ignorance. I want to change tubes on my amp. There are two 6550`s and three 12ax7`s. I want to Re Bias...Where do I put the probes of my meter and what are my bias numbers?...I really need my hand held on this one Thanks.....

[PRNDL]

I recommend reading a good article before adjusting bias.

The simplest method is to put in 1 ohm resistors and measure to the cathode voltage of each tube.

The current depends on the plate voltage of your amp.
Here's a fantastic page for bias settings
http://www.webervst.com/tubes/calcbias.htm