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6J5 input swing
6J5 input swing
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Old 29th December 2006, 10:15 PM   #11
SY is offline SY  United States
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6J5 input swing
Originally posted by lndm
Below 1kHz the gain is 43dB. I am using an Ortofon OMB. I'm not aware of any specs for it, I just loaded the cartridge, played a few records and watched the screen. Most program material seems to be within 5-10mV with regular peaks at 30mV, some up to 50mV with some recordings, and occasionally 70mV.
Yes, but that 70mV will comprise only high frequency components unless you're playing some record made with centimeter groove excursions. That 7V from a gain of 100 will be knocked down by a factor of ten, at the least. Even so, what about that next stage's gain (probably 20-23 dB)? Consider the poor power amp at the other end of some monstrous preamp hurling 70V at it...

No, really, you don't need 7V of input capability on that second stage.
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Old 29th December 2006, 10:47 PM   #12
lndm is offline lndm  Australia
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OK, if the peaks are HF, then I probably have little to worry about. Would it be worth implementing the 3180us EQ at this point instead to be sure? It may reduce some of the signal to very low levels again, though.

What about direct coupling, are there any good ones? I'm thinking this could also help reduce the noise somewhat.
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