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I had a tube fail and fry a screen grid resistor in my 5150 ll. I've already ordered the new sgr's 470ohm/5watt and want to replace them all. I'm pretty good with electronics, soldering etc. but I'm not sure of the location of the resistors. I'm a complete noob at schematics but I really want to do this myself so I can learn along the way. I'm aware of the potential danger present without draining the juice. I know I can do it with some assistance. I also want to add a choke as well. Anyone care to guide me in the right direction? Thanks a ton in advance.

Nevermind about the SGR's. I found them today hiding under the board. I would still appreciate some assistance with the choke though. Which resistor does the choke replace?

The choke replaces the 400 ohm 10 watt ceramic resistor, R210 on the 5150 PCB. May be a different number on the 5150 Mk2.

You say you had a tube fail and fry a screen resistor.
(I'll assume you mean power tube)

Humm,,, My guess is the Amp has issues ,,, likely due to a design flaw.

IMO,,,Not the kind of Amplifier you want to learn from as it could turn into an $expensive$ learning curve.
Phil.

Just be careful to completely discharge the power supply filter caps before you do any work on the amp, otherwise you could be risking death by electrocution....