2. amps-preamps
  3. 1017327087

Capacitance ?

I am currently using a vintage Adcom 555 pre-amp in a simple stereo set-up. On the rear of the pre there is a switch with three settings : Capacitance
55 pf
175 pf
235 pf
What are these settings for? Yesterday I set the switch to 235 pf from 55 pf where it had been set for almost a year unnoticed. And, it may be my imagination...as it sometimes is with the 'audio' senses , but it really seemed as if the sound opened up a bit when I moved that switch to the 235 pf position. Somebody please help me understand.
ronniep

Showing 1 response by clueless

clueless
763 posts
 
I agree with Sean. Never had an Adcom but would bet the switch is to match capacitance with your phono cartridge. If you like vinyl look in the cartridge manual for suggested setting. Will likely have to include tone arm wire and cable capacitance in the mix.

Do not change the switch when your pre and amp are on.

Have you checked the Adcom web site for info? That is the only place to go. Manufacturers often have all the manuals and stuff online if you have lost yours.

I remain,
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