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dc offset at phono inputs
dc offset at phono inputs
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Old 28th December 2006, 05:41 AM   #21
mmerig is offline mmerig  United States
diyAudio Member
Join Date: Jan 2005
Location: south east Idaho, Teton Basin
A cap coupled phono input is still a sonic disaster. At uV levels electrolytic caps seem to be really non-linear.
At uV levels electrolytic caps seem to be really non-linear.
I have found any cap i had at hand at the input a serious degrader of sound.
And so on. . . .

I agree, I would not prefer a cap in series with the signal, but it was the safest, most expedient option to block dc. The amp is very quiet (less noisy than with a moving magnet cartridge and without the head amp), and sounds good.

And what I know, most modern RIAA Phono amp have no input cap.
This is because they are using dual supply, V+ V- and input at Ground level, 0V.
What I am dealing with is a pre-preamplifier, or a head amp, for a low-output moving coil cartridge. There is no RIAA EQ in it, and it has a dual supply rail (V+, V-).

I got it used for about $10 a few years ago, and just recapped it and replaced the gain switch. Now that I know it works, I will probably replace the NP electrolytic (Nichicon ES) caps with 10 uf Blackgate N, or something like that, and call it good for now (space is limiting for a film cap). The input cap may be unecessary, but I'm not sure, and don't want any DC going to my cartridge.

Thanks for the interest and help!
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