1968 Fender Princeton

Installed a 3-prong cord, replaced the electrolytic caps, added screen grid stoppers on the 6V6s, fixed the non-working tone stack, and adjusted the bias setting.  

The owner also wanted more power out of the amp -these Princeton non-Reverbs are very clean and not too loud.

I increased the phase inverter and preamp voltage a tad to drive the power tubes harder, bootstrapped the cathodyne phase inverter for more output, and slightly reduced the negative feedback.  Finally, I reduced the bias just a tad on the preamps for a little more gain.  

I hate to hack any vintage amp, but these modifications are easily reversible and the owner has the few original parts I removed.  

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