Fault – preamp not detecting signal – traced signal through TL084 opamps but indicator section was a little awkward with PCBs in situ. Found contour pot had a cracked PCB: Made enquiries with Porter & Davies and as a refreshing change to most similar other enquiries, Tim Porter was extremely helpful, not only providing schematics, […]
Porter & Davies Bumchum Tactile Monitoring Amp Repair Read More »
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
TLA FatTrack mixer cutting out and valve swap Read More »
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
THD Univalve stopped working Read More »
This Linn Kairn with MM/MC came in dead, apparently “was working fine and went off”. Fuse blown so took a look at the power supply (‘Slimline’ switching version) and found a number of dead parts, including both mosfets shorted, controller and a few resistors: I wanted to check the other component values against the PSU
Linn Kairn ‘no power’ Read More »
