cjfrbw
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- Mar 11, 2010
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I have had some balance problems with my Stax 507 with the right channel being scratchy and low compared to the left. I don't have an amplifier, but use one of the SRD 7 transformers with the pro and normal bias boards added.
I was wondering if the bias voltage was down, because the efficiency also seemed weak.
I measure 240V at the bias pin output jack to ground, and 360V in front of the last resistor (2.2M?) for the pro bias.
I measure about 120v at the normal bias pin to ground, and 160V in front of the last resistor (2.2M?) for the normal bias.
Is the board correct, or do I need a repair? Could it be the Zener diode? Where else should I measure?
Thanks.
I was wondering if the bias voltage was down, because the efficiency also seemed weak.
I measure 240V at the bias pin output jack to ground, and 360V in front of the last resistor (2.2M?) for the pro bias.
I measure about 120v at the normal bias pin to ground, and 160V in front of the last resistor (2.2M?) for the normal bias.
Is the board correct, or do I need a repair? Could it be the Zener diode? Where else should I measure?
Thanks.