The chart below shows typical readings for a transformer with a primary, high-voltage, 5-volt rectifier, and 6.3-volt filament windings. the three deck one we use costs more than a two deck pot, but the correct taper for the two deck version is no longer available. We will be able to determine which is the center-tap when we take voltage readings as outlined later. for the primary, put brown in "white", violet in "yellow", grey in "orange", and blue in "black".Īs for the attenuators, in practical use there is no difference between the two kinds. put the black and yellow secondary wires in the two holes marked "blue" and put both the red (pinkish) and orange together in the hole marked grey. The larger diameter wires are the primary and the smaller ones are the secondary. ignorance is not your friend when dealing with potentially lethal line AC. You should look at the transformer diagram on the side of the power transformer and compare that to the schematic in the mc76 manual so that you understand what you're doing. note that the PCB says "orange" where you should actually put the red wire. This may be in the form of a phasor diagram, or using an alpha-numeric code to show the type of internal connection (wye or delta) for each winding. Yes, if you have an orange and yellow wire on your audio output transformer leftover, solder them together and insulate the connection with heatshrink or tape.
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