Author Archives: Frank

Upgrade PCB for Fender Blues Junior

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 […]

Posted in Uncategorized | Comments closed

Electro Harmonix Big Muff Pi Repairs.

EH Big Muff effects pedal repair at JPF Amp’s London workshop in Denmark St.

Posted in Effects pedal, Effects repair, JPF Amps, London | Tagged , , | Comments closed

Ibanez TS-808 Tube Screamer Reissue Switch Repair.

The Ibanez TS-808 Tube Screamer is, rightly, regarded as a classic pedal, and has been reissued by Ibanez; this is lucky as an original TS-808s will set you back several hundred pounds.     Unfortunately the switches on the reissue (and indeed the originals), are not that robust. This pedal came in with a broken […]

Posted in Effects pedal, Effects repair | Comments closed

Regent Sounds Website up and running.

Regent Sounds, who are Central London’s longest running Fender & Gretsch specialist, and where we are now based, have (finally) got there website up and running so you can browse their stock and even make a purchase! As well as Fender and Gretsch, Regent Sounds also stock Musicman, and Danelectro guitars, Blackstar and VOX amps, and […]

Posted in Guitar Amps, Vintage amps, Vintage guitars | Comments closed

WEM / Watkins Copicat tape echo repair extravaganza

We had a bit of a WEM / Watkins Copicat repair extravaganza at JPF amps. Here’s a nice photo of three of the 8 (yes eight!!!) we had in for repair.   Great sound that can only really be done by a genuine tape echo.

Posted in Amp repair, Effects pedal, JPF Amps, London | Comments closed

Leslie 122 Relay Repair

Here’s an emergency repair I did for a Leslie 122 cabinet. The fast / slow relay had died, and I needed to find a solution with parts from Maplins! The fast / slow replay relay switching is quite interesting in the 122. The cabinet is connected to the organ by a 6 pin connector, however […]

Posted in Amp repair, Hammond organ, Leslie cabinet | Comments closed

Fender Tonemaster (Tone-Master) Guitar Amp Repair

Although much credence is given to the notion that hand-wired amps are inherently superior to other methods of construction, this is certainly not always the case. Here’s the inside of a Fender Tonemaster amp, which as you can see is a total rat’s nest of wires. I dread to think what Harry Joyce would have thought […]

Posted in Amp repair, Guitar Amps, London | Comments closed

Gallien Krueger 2001rb Bass Amp Repair

Gallien Krueger make amps that are both well engineered and good sounding. I recently had a GK 2001rb bass amp in for repair. This is a complex machine (for a bass amp: see photo of innards); it has two 500W class G amps to provide do the heavy lifting in the low end (one each […]

Posted in Amp repair, Bass Amps, London | Comments closed

MESA Carbine M9 Bass Amp Repair

Here’s some photos from an emergency repair I did for the band Swans. I got phone call from their tech saying that one of their amps. a MESA Carbine M9, had died with smoke emanating from the innards. Swans needed the amp turned around quickly as they were on tour. I said that this didn’t look […]

Posted in Amp repair, Bass Amps, Guitar Amps, London | Comments closed

Hughes & Kettner TubeMeister 18 Repair

I’ve had a few Hughes & Kettner TubeMeister 18 amps in for repair. This is an 18W fixed bias amp that uses 2 x EL84s in the output stage. These amps have a quite sophisticated biasing system that automatically adjusts the output valve grid voltage for optimum bias, and also shuts the amp down in the […]

Posted in Amp repair, Guitar Amps, London | Comments closed