![]() ![]() Using the brown and blue wires the other way reduces an enormous amount of hum and buzz so the amp is mostly quiet, but seems to sound a bit flat and dull. However, I notice that with one way the amp has :Ģ) a lot more "sparkle" or treble sound to it like an EQ device was added to the signal or the treble pot is turned up higher andģ) the amp signal is louder and stronger. On my current build however, no squealing occurs (amp uses normal AB763 NFB) with either orientation. ![]() On a previous amp build I found that the amp squealed when I had the primary wires one way so reversing them was easy. BLACK : Common BROWN : 5W/25V Only RED : 2.5W/25V Only ORANGE : 1.25W/25V Only VIOLET : 0.31W/70V Only GRAY : 0.63W/70V Only BLUE : 1.25W/70V Only WHITE : 0.31. I realise however that unless you have the original transformer, the colour code is irrelevant and the consensus is to simply try both primary wire orientations and see which works. Normally the output transformer's colour code has a brown and blue wire (other than the centre tap) for the primaries. Hi guys, could you let me now how I determine which wire orientation to use for a Hammond 15watt AB763 style output transformer?
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