![]() Three-phase electric power (abbreviated 3) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. Why anyone would need to do that is mostly beyond me (anyone actually got a 32 ohm speaker?!), but there's no reason it wouldn't work. Three-phase transformer with four-wire output for 208Y/120 volt service: one wire for neutral, others for A, B and C phases. just GROUND the negative speaker terminal (you might have to tap into where the black wire from the OPT grounds inside the chassis) and hook the positive speaker terminal to the 16 ohm tap. ![]() ![]() you COULD use a 32 ohm speaker on the HF89. Now, the way the transformer is wired, the same transformer could work either way. On the HF89, the feedback was taken from the 4 ohm (green) and 16 ohm (orange) taps, through a rather complex network. Here's the wiring from that one:įrom comparing the HF89 to HF87 schematics, here's the only way I could see that the transformer could be wired in an HF89: If there's five wires on the secondary side with those colors, I don't think it's an HF-89 transformer.
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