Output transformer Music Man 2575 150W specs?

[crazytooguy]

Hello all. Anyone know the primary impedance of the Music Man output transformer for the 2575 chassis (150W)? Transformer number is 200-130. I measured it and came up with 2k. That sounds too low to me. Thanks!!

[imaradiostar]

My music man hd65 used some strange hybrid design and a 6600:4&8 output tf with ridiculously high plate voltages and 6ca7's. I would suspect a music man with 4 output tubes would have between 2k and 3k3 impedances plate to plate.

Have you measured it with an ac voltage?

jamie

[Enzo]

The EL34 was designed to run at those elevated plate voltages.

[imaradiostar]

The EL34 was designed to run at those elevated plate voltages.

I'm sorry if I implied that the high voltages were bad- I just recall them being high compared to the average marshall or fender circuit and being driven (if I recall correctly) from the cathodes or something instead of the normal grid drive. I had the version with the solid state phase inverter.

I think it's interesting to note that music man used a 6k6 impedance like many hifi applications while other brands used much lower impedances. I suppose this was the ideal given the high plate but moderate screen voltages the output tubes were running at.

jamie