• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

solid state rectifier

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wanders

Member
Joined 2011
I'm having an issue with a kt88 project: the 5ar4 rectifier is sparking. (The "diode mod" is installed.) I've tried a couple of tubes (no change) and I'm afraid of damaging them. So, I'm wondering if there would be any harm in using one of those solid state substitutes while I'm tracking down the problem.
 
kodabmx

kodabmx

Member
Joined 2011
Shouldn't be a problem, but you'll probably have a higher B+ and it'll be present immediately at power on. I'd suspect that there is too large an input cap on the 5AR4. Run each plate of the rectifier through a 10W 100R resistance, and see if that fixes it.
 
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