I had a PV10A and replaced the high voltage caps in the power supply. However, the originals were just starting to show their age and the unit wasn't as quiet as when I first acquired it. In fact, it actually had started generating hash in the near-20KHz range (above what I can hear - I need to thank my son for pointing that out). I got the replacement caps straight from CJ and they made a prompt improvement in sound quality. These models are now in the fifteen year old range and replacing those HV caps probably isn't a bad idea.
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