Rectifier was still ok and the transformer had the correct voltage on its output terminals, then on a closer look realized that the secondary windings were marked 30vĠv 30v 0v and the link wire between the windings had been connected to both the 0v terminals, however as it turned out the labels were incorrect and the 30vĠv should have read 0v 30v i nstead so the transformer had been wired incorrectly, so re wired the transformer These we duly replaced and the unit powered up, the amplifier still was not working, there appeared to be no voltage on the input to the rectifier or at least not what was expected ie 30v 0 30v AC, the new bridge Transformer but had failed to revive the amplifier to working condition.įirst thing was to strip the main amplifier chassis and remove for investigation as seen below.Īfter an initial poke around with the meter found the main bridge rectifier had blown as well as 2 output transistors on one of the channels The Amplifier had originated from the USA and had 110v Transformer fitted, the owner had run the amplifier on UK 240v mains and the unit had gone bang, he had then taken it to a technician who had fitted a new 240v Repair of Gallien Krueger 250 ML Amplifier
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