Category Archives: Uncategorized

JPF Amplification now at 5 Denmark Street.

By Frank | Published: April 10, 2021

We have relocated our work shop to number 5 Denmark Street, WC2H 8LU.

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Upgrade PCB for Fender Blues Junior

By Frank | Published: June 3, 2019

The Fender Blues Junior (BJ) is probably Fender’s best-selling valve amplifier. However, it does have a number of poor design features, not least the layout of the PCB on which the EL84 power valves are mounted. The EL84 is a well-designed valve as the high voltages on the anode (pin 7) and screen grid (pin 9) are […]

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