Riff-Tech

Riff-Tech Guitar & Amplifier Repairs!
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09/28/2026

Here's a 1990 Marshall JCM 800 Model 2205 which arrived at the shop with multiple issues.

It was low on power, the power switch worked intermittently, it hummed, squealed and basically sounded horrible. Now it's back to it's former glory and ready to melt some faces again!

08/19/2026

Here's an old Traynor YBA-1A amp head that a customer wanted the circuit restored to original. It had an overdrive modification and a post phase inverter master volume. Now that it's back to stock, you can hear how much distortion the output tubes make when it's cranked. This is very much like an old plexi Marshall!

08/06/2026

Testing an HH Studio-60 Bass amp after repairs.

08/04/2026

Testing a Fender Champion 600 after repairs.

07/24/2026

Testing the Dr Z MAZ 38 after reassembly.

07/23/2026

In addition to having a bad connection on a filter capacitor, the Dr Z MAZ 38 amp also had a failing rectifier tube. This problem was discovered by doing the highly technical "tap test" which requires the use of a specialized diagnostics tool, the Riff-Hammer!

After resoldering the filter capacitor on the Dr Z MAZ 38 amp, I ran a bead of hot glue to keep it from moving. This wi...
07/23/2026

After resoldering the filter capacitor on the Dr Z MAZ 38 amp, I ran a bead of hot glue to keep it from moving. This will keep the problem from happening again in the future.

07/23/2026

Here's the cause of the intermittent hum when the Dr Z amp was tipped. One of the filter caps had a broken lead.

07/22/2026

Here's an interesting problem...

06/26/2026

Testing a Mesa Lonestar amp after repairs. This amp was cutting out intermittently, but not anymore!

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