Unique Tube Amps for Guitar

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The Repairs

Valco Tremo-Tone

Royal Freshman

Kay 703

JMP Super Lead

Acoustic 370

Acoustic 370 Repair

The Acoustic 370 is a legend in solid state amps. It puts out 300 watts and has an incredible tone. Most of them are found in studios where they drive huge speakers.

The owner said that this one had been to three techs that did not fix the amp. The last one wouldn't let him try it in the shop, and wanted more money to fix it again.

The amp needed a ton of work. The output transistors had failed and took a bunch of other parts in the process. That's the problem with these old designs. Newer amps have protection circuits, but they rob tone.

The amp needed some 20 parts (transistors, diodes, etc), plus the output cap can decided to call it quits.

The end result, however, was worth the effort to bring this little jem back to life.

Check out my tube guitar amp repair blog (on MySpace)

Natural health research and writing is my main career. I'm a licensed naturopathic physician. www.naturdoctor.com and LinkedIn

Building and selling tube amps for guitar and HiFi is a hobby based on my previous career as an Electrical Engineer. Ampersand Amps