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phydoux
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Last seen: 3 years 1 month ago
Joined: Oct 5 2011 - 2:46pm
BAT VK-120 problem

Today when I turned on one of my BAT VK-120 monoblocks the autobias did not occur (no green lights at all), the blue "pilot LED" on the front face does not turn on, and the tubes are only heating up slightly. I checked the fuses and all five are good.

Does anyone have any guesses as to what I might be able to check next or look for?

Thanks.

JohnnyR
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Last seen: 1 year 3 months ago
Joined: Sep 10 2011 - 10:12am
I'd Look For........

......a bank loan to pay for a repair. Seriously though if you aren't a tech then don't mess with a tube amp. They have high voltages that can be lethal to the unknowing.

phydoux
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Last seen: 3 years 1 month ago
Joined: Oct 5 2011 - 2:46pm
Thankfully I am a tech and

Thankfully I am a tech and know all about high voltage step up transformers. Since my original post I have narrowed it down to the primary transformer. Because they use a custom handmade transformer which appears to utilize a multiple level step up design, I will need to know which pin in the connector is used for what. Since I could be looking for at least 600 volts, I know not to cross the wrong wires. This is why I first need to find out which pin does what and what value I should see at each pin.

Transformers are actually very simple and this one is no longer stepping up like it should, I am probably going to be looking for a replacement transformer. :-(

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