![]() Even worse, the status LED’s that indicate which channel is active, are mounted below the boards where your fingers can’t get to them to line them up with the holes in the front control panel.Įxamination of the boards didn’t reveal any obvious component failure, but a check of the DC conditions with a DVM indicated problems with the low-voltage (LV) power supply, ie the +/- 18V DC rails (regulated). Unfortunately, they overlap and things are complicated by the board mounting arrangements, so it is a very time consuming job removing these boards for repairs, plus it’s fiddly, with the ever present danger of introducing additional faults that weren’t there in the first place. No fuse had actually blown, and all the valves tested OK, so the problem was in the circuitry itself.Īll of the circuitry in the Pittbull is mounted on two large printed circuit boards (p.c.b.’s) which run pretty much the width of the chassis. ![]() The stated fault from our customer was there was a pop, then nil output. This example has obviously had a hard working life, and our repairs actually started with the cabinet, which was beginning to fall apart. This time we are looking at a classic hard rock guitar amplifier from the USA, manufactured back in the early 1990’s: the VHT Pittbull amp. ![]() Hello and welcome back to the blog after a break of several weeks. ![]()
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