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In Reply to: RE: Turning on older SS gear after storage posted by David Yost on January 03, 2017 at 11:55:17
I'd make sure the proper fuses are in the unit. Use a Variac to slowly ramp up the voltage to reform the caps & check for shorts.
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Thanks, FL.
Do you have any suggestions for the ramp up profile? I have read somewhere that solid state should be brought up to full voltage relatively quickly -- in a minute or two -- as opposed to tube gear.
David
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.
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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