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There are two ways I know of - both with a few disadvantages...

1/ The rough solution: Eli talks about it above and VTL did this with their "Ultimate" preamp - a BIG cap coupling the cartridge into the cathode. The disadvantage is obvious - passing the ultra fine detail signal off a good MC through a big elko cap just makes me cringe!

Plus there could be enough leakage in such a cap to "bias" the cartridge, or at least slowly magnetise it.

2/ The elegant solution: place the cartridge between the cathodes of a (double) current sourced diff pair of MATCHED input tubes. The match has to be perfect of course, so there is no current through the carridge - but that would work perfectly! I have often wanted to try this, and my RTP3 input stage would be the ideal test bed, but a slight disadvantage is that if any little thing goes wrong - let alone a tube failure - the megabuck cartridge is toast...

Regards, Allen



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