Guitar Tube Amp Restoration and Repair by Dr. Ron

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The Tank

The Tank is a high-quality Precision PA amp that I converted into a guitar amp. It has a pair of 7868 output tubes rated at 32 watts output power. This makes it very loud, so it's going to be a great high-power head for jazz.

It has a 12AX7 preamp and 12AT7 gain and cathodyne phase invertor. The circuit is a combination of the infamous Amgeg Portaflex and a 5f4 Fender Super.

It has a very thick steel chassis and the metal case is covered in tweed, which makes this very sturdy for the road. I call it The Tank.

The circuit is built with true point-to-point, which results in better tone and lower noise. It uses four high quality teflon coupling capacitors.