Tag Archives | amp repair

80-90% of the faulty units that come in are amp repairs, though I do see some pedal repairs too.

Of the amp repairs, about 50% are guitar amp repairs, 30-40% are bass amp repairs and maybe 10%-ish are PA and hifi amp repairs. Generally, I avoid HiFi gear, because I get hundreds of amp repair enquiries and I have to say no to some of them! :(

About 40-50% of the amp repairs are valve amp repairs and the rest are transistor based.

8valve-preamp-waveforms 200mV

Art valve Preamp Repair – Ampworks, Newark

No fault found with this Art tube mic preamp repair, however I did get a chance to do some interesting tests on the unit’s distortion characteristics. The first picture shows the unit distorting with signals at three different input levels. The Blue trace is basically clean. Part of the valve ‘sound’ is that Valves clip […]

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Egnater-repair-rebel30

Egnater Repair – Rebel30

This amp is a Rebel 30 by Egnater. At first, I had a bit of trouble with the Egnater repair but I’m pleased to say that I found a solution for the customer. The diagnosis itself didn’t prove a problem, the problem was simply the gain potentiometer itself. This is a dual ganged part (2 […]

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Blackstar amp repair

Blackstar amp Repair – Series 1-45

This Blackstar repair was a simple valve amp service before the amplifier was sold. The amp is a series 1-45 2×12 combo. It’s a fantastic 2 channel amp with 4 modes, bright Clean, warm clean, Crunch and Super Crunch. The amplifier uses Blackstar’s DPR and ISF patents, you can read more about Blackstar’s DPR on […]

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HT-CLUB-40-Repair

Blackstar Repair – HT40

Recently, a Blackstar amp repair was brought to my workshop in Newark. The amp was an HT40 (the Club 40 combo) in working condition, but the owner wanted to try a new set of EL34 power valves in the amp. He selected a matched pair of Tung Sol with slightly higher gain (according to my […]

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1962 Vintage Ac30 Repair

Vintage AC30 repair – 1962 Vox repair

The guys over at Confetti in Nottingham brought me this vintage AC30 repair. It appears to be a 1962 JMI era Vox model but I’m an amp tech, not an amp historian, so I may be mistaken! It’s definitely an AC30/6 model, only made in smooth black vinyl in 1962. It’s very nice! The customer […]

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Mesa Boogie Bass 400+ Repair

Mesa Boogie Bass amp Repair

This mesa boogie bass amp repair had the highest power valve count I’ve seen. The amp uses no less than twelve 5881 6L6 valves! Like the recent fender amp repair this valve amp was blowing fuses. Also like the fender repair, the failure was down to a damaged power tube. Two in fact. Much is […]

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