Okay... so I've built my first amp, and everything went well, and I'm comfortable poking around in there...

Now I am going to start trying to do some easy stuff on some other amps...

I have three 80s Marshalls here that I need to retube and rebias - a 50w horizontal input JCM800, a 100w JCM900, and a 100w horizontal input JCM800. The 100w 800 has other issues that I will tackle last...

I've found some articles that describe different ways to determine the correct bias values for your amp, and I've found diagrams of the pinout on an EL34... but the instructions on determining the values assume you are quite familiar with the pinout, and the pinout diagrams assume that you know how to read the diagram without any actual labeling...

From what I understand I need to figure out the plate current, then plug that into the handy weber bias calculator, then adjust the bias to the suggested value and see how things sound...

I read more about the cathode current method of determining the plate current...

What I haven't been able to figure out is a list that goes something like:

'Measure from x -> y with your multimeter set to z, then do, etc. until you have figured out the plate voltage.

Now measure from pin n to check the bias'

Instructions of that sort would be really helpful... or at least some clarification on the pinout and how to measure some things...

Thanks for any help!