Tenma 10A Variac

The Tenma 10A Variac, otherwise known as a Variable Transformer, is the perfect variac for Marshall Plexi era amps, etc. These things are built like tanks, and I've never had a problem with mine. I often run my 68 Marshall Plexi at 90v (same voltage as Eddie Van Halen, and it gives a nice subtle compression and smoothness. With some amps you will hear a difference more than others. The positives of using thse is that it puts less stress on your amps components, especially the transformer. The only realldown side to using them is the theoretical cathode stripping on the power tubes. I've never had a problem with this, and frankly never known anyone to have a problem. I'm sure it occurs, but it hasn't had a noticeable effect on the life of my tubes, so I consider it to be negligible. By the way, you don't want to re-bias your amp for the lower voltage. I know some people say that on the internet, but you shouldn't do it if you want the desired effect. The best place to buy one of these is at MCM Electronics. Go to their site and do a search for "Tenma Variable Transformer" and you'll see it come up with a few others. For $79.99 it's not a bad deal!!!

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