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Tech: Setup, Repairs and Mods Guitar workbench discussion such as setup, repairs, mods, installing new parts and more.

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Old 12-28-2000, 01:28 AM
firegarden  is offline
 
Join Date: Dec 2000
Location: Singapore
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Re-biasing my Marshall


Can anyone tell me a detailed process on how to rebias my 50W Marshall super lead. It's really old abt 30+ yrs and I dun want to blow anything...moreover going to a tech here costs a bomb
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Old 12-28-2000, 12:48 PM
jeff l  is offline
 
Join Date: Dec 2000
Location: St. Augustine Beach, Fl
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Re-biasing my Marshall


FG,
* * You need a tool like the 'Bias King' or a similar instrument to fit into the power tube plates and take voltage readings. You also need to know where the bias trim pots are and how to adjust them.

* * *I'm looking into this myself as I'm sick of paying big $$$ every time my Marshall has a problem. I'm going to get the book 'How to Service and Repair Your Own Tube Amp'.

* * * * * * * That said, you obviously don't want to go poking around a tube amp without knowing EVERY safety precaution to be taken. Tube amps can kill you, even when they're not plugged in. If you even have the slightest doubt it's better to spend money than to conduct voltage with your body. *Good luck and be SAFE!!!
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