Mesa Boogie MK IV

Too many controls on a Boogie’s front panel for me to be a fan but people seem to love them. This one below was cursed with a strange fault of bias instability which would lead to humming as the bias drifted off and ultimately to red plating after 30 mins or so. The cause of … Read more

Fender Supersonic Twin 100

Seen a few of these recently and worth sharing some problems and interesting solutions that I have found. Fender Supersonic – no sound or fading sound If your amp produces no output and the lights on the back are flashing about then you might have a faulty autobias unit. The auto bias unit fitted to … Read more

Vox AC15

Restoration project of a 1962 Vox AC15.  Clearly seen some earlier work clue being the orange drop capacitors fitted around twenty years ago.  Most of the carbon composition resistors were high asnd showing signs of surface cracks so all replaced.  The Mullard valves appear to be original and in fine working order.  What a  great … Read more

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