VOX BerkeleyII Rebuild project.

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Hi, I'm new to this forum. I am rebuilding a solid state VOX Berkeley II amplifier. The amp that I have seems to have very little treble output, but plenty of bass. Are all of the Berkeley amps this way, or should I be looking for a problem in the treble circuit?

Thanks,

[R.G.]

Hi, I'm new to this forum. I am rebuilding a solid state VOX Berkeley II amplifier. The amp that I have seems to have very little treble output, but plenty of bass. Are all of the Berkeley amps this way, or should I be looking for a problem in the treble circuit?

Congratulations. I like those. I have two of them.

You should be looking for a problem in the tone circuits. They are not by nature bass-heavy. The bass and treble are probably tied up in the same circuit. They did what I consider silly things by using electrolytic caps in the tone stack, but times are different now than they were then. If it's a 1uF or 2uF cap, I advise replacing it with a matching capacitance in polyester film, which are available today but were not in the 1960s/70s.

By the way, it's good advice to replace all of the electrolytic capacitors including the bipolar/non-polar electrolytics while you're at it. A very common problem with all of the Thomas Vox (and other!) amps is that an electro goes bad, making the amp non-functional or just sound funny. The electro is found at some expense in bench time, and replaced. The amp then works OK... until the next electro drops below the functional line.

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VOX BerkeleyII Rebuild

R.G.,

Thanks for the response. I will take a look at the circuit and see if I can find the problem.

Best Wishes,