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About djpatb

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    Cleveland, OH
  1. Hi guys, I'm just starting to read about the basics of amp bias cuz I have a buncha tube heads and I'd love to be able to work on them myself. I just ordered a Weber Bias Rite and should have it next week. From what I've read it boils down to multiplying the plate voltage of the amp by the cathode current (mA)...and getting them to equal to ideal wattage of the tube. For example, I'll be working with EL34's...which are supposed to max out at 25 watts. Let's say I wanna retube my Bogner Shiva. I've read on the Bogner forum that the plate voltage is around 500. If my math is right I'd have
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