carver c1 preamp infrasonic filter

[robertcdt 3]

I find this filter confusing and not sure when to use it.

when playing vinyl find it to have some use if I forget to turn it off and play a cd I get distortion is there something wrong with my c1 or is that the way it works.

[wrf 4,878]

The infrasonic filter is designed to be used when playing vinyl. Some, if not all turntables will generate an extremely low frequency rumble.  The infrasonic filter will removed that rumble.

 

If your infrasonic filter is generating distortion, there is something wrong.  It could be a dirty switch or something else.  

 

All C-1s are getting old.  Switches and POTs get dirty over time.  Electrolytic capacitors degrade.  You should consider a refresh where all electrolytic caps get replaced and everything gets cleaned. If the problems with the infrasonic filter persist, a good tech can diagnose them following the refresh.  Until then, just leave the filter OFF.  It's really only useful with turntables that have large amounts of rumble. 

[Sk1Bum 11,368]

Hello robertcdt and welcome to thecarversite.com. Glad you found us.

 

If you've not found them yet, the owners and service manuals can be downloaded here:

 

https://thecarversite.com/manuals/mandir/Carver C-1 owner manual.pdf 

 

https://thecarversite.com/manuals/mandir/Carver C-1 Service Manual.pdf

 

You may find them useful. I certainly did. Well, the owner's manual anyway. I am in no way an electronics tech, and the service manual is mostly Greek to me.   Fortunately, there are many talented techs here that understand it well.

 

 

[robertcdt 3]

6 hours ago, wrf said:

The infrasonic filter is designed to be used when playing vinyl. Some, if not all turntables will generate an extremely low frequency rumble.  The infrasonic filter will removed that rumble.

 

If your infrasonic filter is generating distortion, there is something wrong.  It could be a dirty switch or something else.  

 

All C-1s are getting old.  Switches and POTs get dirty over time.  Electrolytic capacitors degrade.  You should consider a refresh where all electrolytic caps get replaced and everything gets cleaned. If the problems with the infrasonic filter persist, a good tech can diagnose them following the refresh.  Until then, just leave the filter OFF.  It's really only useful with turntables that have large amounts of rumble. 

 

[robertcdt 3]

Thanks for the advise. I have been leaving it off and that is working . I will give it a shot of contact cleaner hopefully that will help but I am never that lucky.

I would love to learn more about recapping. I am a dental tech and have been repairing lab equipment all my life  with some experience with replacing electronic components.

I think I will start with something smaller than the c1 I have a technics SL 1700 turntable its board is small and not so many parts.

Dose any one have a opinion about the kits on eBay c1 refurbish kit parts $38.00 parts and instructions $95.00 ?

[Receiver2000 3,963]

Wrlcome!!!