Category Archives: Amp repair

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.

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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 […]

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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 […]

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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 […]

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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 […]

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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 […]

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Vintage Marshall JMP 100W Amplifier Repair

We often get 70’s Marshall JMP amps in for repair; these are excellent rock amps and are still very good value for money. One the major issues with these amps are the voltage and impedance selectors which are prone to falling out. Someone had done a really good job of wiring the mains selector in […]

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Ashdown MAG300 Bass Amp Repair

I’ve had quite a few Ashdown bass amps in the workshop for repair. Here’s the inside of a MAG300 I had in a recently. The amp was not powering up, and on inspection the mains fuse has blown. On energizing the unit employing a current limiter (a 60W light bulb in series with the amp), […]

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Ampeg SVT Repair.

Here’s a rare example of a 70s Ampeg SVT that I had in the workshop recently. The SVT has, rightly, gained the reputation of being one of the greatest bass amp ever made. Even today the SVT is the industry standard bass amp for live work. Working on these amps is not for the faint-hearted, […]

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Fender Blackface Deluxe Reverb repaired at JPF Amps

We’ve repaired hundreds of vintage Fender amps, and it’s always a pleasure to get these classic amps back in tip top working order. It’s a testimony to Leo Fender that so many Fender amps from the 1960’s are still being used today. Here’s a picture of the inside of a vintage 1960’s Fender Blackface Deluxe […]

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