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71.85.6.3
In Reply to: RE: Turning on older SS gear after storage posted by David Yost on January 04, 2017 at 05:20:34
I'd like to better understand this too. I've read that transistors will draw more current if less than their working voltage is applied (I believe I have that right). So if a SS amp circuit is designed to work at 35 VDC, and you're only applying 5 VDC via the variac, the transistors may draw too much current and burn themselves out.
That being said, I have an old James Bongiorno designed SAE power amp, and also a Marantz 1060. The service manuals for both of those mention the use of a variac during service, so I've always been a bit confused on the voltage subject with regard to solid-state.
Hopefully someone in the know will chime in with more feedback on the subject.
Follow Ups:
That's why it's important to have correct fuses in unit, first. To avoid excessive current draw damage due to shorts, bad caps, character of solid-state devices.
No volume, speakers connected, no inputs.
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