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Questions about tubes and gear that glows. FAQ

Re: importance of biasing tubes

Do some research on what you have. Read the owners manual if you can find it somewhere online. It should tell you the basics of how to set balance and bias. There are some real experts, not me, on most of the vintage amps in this forum if you let them know what you have.

For balance and bias on most amps: all you really need for most amps is a relatively cheap DMM with ac and dc voltage reading. Most amps designers/manufacturers make it easy to do bias and balance by reading the voltage drop over specific resistors. Most even provide pins on the side of the chassis for your convenience to attach your meter leads to. The owners manual usually gives a designed range for the bias setting.

I don't know your skill or knowledge level, if any of that seems confusing then you need to bring it to a tech or do some quick learning. But be careful, the capacitors can store a lot of potentially dangerous energy, some even hold the charge for a while even when the unit is not plugged in, that can be discharged through you if you are not careful.

Good luck.


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