Click to enlargeThe fix for a major problem with
the early Vibro King (Fender) amps.

Modification to repair the problem with the early Vibro Kings. They would burn up the EL84 Reverb tube due to design errors.

The tube is a single ended Class A amp and it was biased way, way too hot - far beyond the capacity of any tube.

The kit is fairly easy to do, and besides making the amp more dependable, the reverb sounds much better without the horrid crossover distortion caused by incorrect bias.

Vibro King Repair Mod
Am537 fender kit$25.00
final notes on web page

Dan's Legendary Book "Inside Tube Amps" is now available on Amazon/Kindle

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Torres Engineering

Sandpiper Drive

Yuba City CA 95993

this is not a "walk in" shop

I am Partially retired due to illness, but getting better!

in business 48 years