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RE: phono noise floor

I have a Fisher power amplifier out of a console, great midrange, but when I tried 5751 to replace the 12ax7 drivers, there was no output at all. We did a spice simulation and found out the 12ax7/5751's were being operated out of spec. The cause was the power amp contained the power supply for the preamp and tuner, which were not hooked up, so the B+ was higher than it should have been. It was definitely a surprise, since every 12ax7's worked and none of the 5751's.

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  • RE: phono noise floor - fredtr 12:49:24 02/24/15 (0)
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