ValveKing Blowing Fuses

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johnny be good
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Re: ValveKing Blowing Fuses

Post by johnny be good » Sun Jan 23, 2022 8:02 pm

Thanks dak I ordered diodes so we will see what happens on my learning project next week when they come in.

johnny be good
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Re: ValveKing Blowing Fuses

Post by johnny be good » Sat Jan 29, 2022 2:36 pm

"YES" :D Well its working removed the four diodes two of them tested bad so I replaced all four and yes it works. Thanks all that have helped and I learned a lot. I bought it for parts because I already have a VK Head and a VK 212 and the parts one had all new Sovtek tubes in it so now I have three VK100"s.
I am not a professional musician I am a retired contractor remodeling a hall that I own as a retirement project hoping to give young bands a place to play without getting thrown out of garages for noise so these amps will come in handy.
Again Thanks All could not have done it without you

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dak
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Re: ValveKing Blowing Fuses

Post by dak » Sat Jan 29, 2022 4:01 pm

Huh, makes me wonder what caused the first diode to blow. Inrush current? Let's hope there won't be a repeat. Might make sense to mount the diodes with a bit of air below them in case it's really a matter of high current (and voltage low enough that the diodes take enough of a share of a power in spite of only losing 0.35V on average (0.7V with a 50% duty cycle). Enzo said that this was for heating, so it might be low-voltage/high-current after all. When the diodes are too close to the PCB, heat may have more of a problem dissipating.

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Enzo
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Re: ValveKing Blowing Fuses

Post by Enzo » Sat Jan 29, 2022 7:09 pm

It isn't necessarily a systematic problem. Random component failures are common. There may not have been a specific electrical instance that caused the failure. It is comforting to think in terms of I-did-this-caused-that. But we usually never know. Oh I have my tales of poking a meter lead on a power chip and slipping and SNAP I blew up the chip. But most times you never know. You generally have a much larger static charge on your body than you realize. So can your gear. You might plug a speaker cable into an amp and discharge several thousand volts into the circuit and never know it. It weakens something, and four months later, a part fails. No way we associate that static discharge we never felt with a failure months later. But that is exactly the sort of thing that happens.

johnny be good
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Re: ValveKing Blowing Fuses

Post by johnny be good » Sat Jan 29, 2022 8:06 pm

Bought it non working so I don't know any symptoms. But I will give it a workout and see how it holds up under a load. Just happy it works for now

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