Quote:
Originally Posted by Edward Huggins
Ah, I now see the OP is not using the word "Bias" in the electronic sense, but in the literal sense. It's a rather esoteric way of explaining an electronic characteristic!
Again, all my 60 years experience of the theory of crystal/ceramic cartridges working into a high-impedence input (c.1 meg ohm load) tell me that no form of EQ adjustment is needed - it is performed by the inherent piezo/mechanical virtues of the cartridge per se.
So why do these Posts seem to wander off into attempting to change these inherent characteristics by some form of variable EQ/Gain? I just don't get it. HELP!
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He's using a magnetic cartridge for his microgroove records so he needs a separate RIAA preamplifier for them. Otherwise he seems to think that the frequency correction for the 78s is performed by the input circuitry of the amplifier rather than by the characteristics of the ceramic cartridge in conjunction with the 1M resistors. Thinking of the tone controls as filters seems to be the root of this.