February 2020

TLA FatTrack mixer cutting out and valve swap

Customer states that TLAudio FatTrack mixer is cutting out after a while, and wanted a valve swap for something better. Found MPSA42 getting extremely hot exceeding 100deg C and breaking down (this is part of the HV circuitry for valves), even with small heatsink attached it was still 86+ and clicking out of service: The […]

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THD Univalve stopped working

This THD Univalve came in with a dead HV fuse, was replaced, serviced and tested all ok with the exception that the bias is way too hot for the installed 6L6GC valve. Measuring >110mA and red-plating on Hi-V setting. On Lo-V it was ok of course, but really needed a rebias for using on our

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