Been working on a friend's VHT Two/Fifty/Two amplifier.
The amplifier had been blowing the HT fuses immediately upon power up. This occurred with or without the tubes in the amplifier.
I was honestly kind of puzzled by the entire thing. Both channels had the exact same symptoms. While one channel might have had a set of filter caps go, I refused to believe that both channels had them go at the same time.
I decided to email the VHT/Fryette and try and get some help.
They were very friendly and explained that the fuses in the amplifier are purposely rated conservatively. Most people do not experience a problem but some people with abnormal power conditions may.
They suggested replacing the .5 Amp fast blow fuses with .75 Amp fuses.
Success!
So, I replaced the tubes and reassembled the amplifier.
The moral of the story is that sometimes there is nothing wrong. Had I not contacted the company, I'd still be dickering about with the amplifier and never any closer to finding out the real problem.
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