Film-Tech Forum ARCHIVE: Dolby CP55 Magnetic Level

This is topic Dolby CP55 Magnetic Level in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

To visit this topic, use this URL:
https://ft-forum.com/ft/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=004826

Posted by Michael Harlow (Member # 1353) on 04-25-2003, 01:05 PM:

Hi all,

I have just started looking at the CP55 instructions here on film tech and was wondering about something.

I have a mixer attached to the mag input on the cp55 to give me PA and extra aux inputs, question is : how do i increase the gain, i know there are a selection of circuit boards in the CP55, which one do i tweak?

Thanks

Michael

Posted by Gordon McLeod (Member # 33) on 04-25-2003, 03:51 PM:

if memory serves there is only a header to select input level hi or low but gain adjustment is done in the mag preamp

Posted by Bernard Tonks (Member # 809) on 04-25-2003, 06:42 PM:

On my Dolby CP 55 I used to run a 10 channel power mixer through the non-sync card which has gain adjustments. This was for a mic, CD/MD, Revox 1/4 inch open reel. The mixer was also used for 16mm & DVD projection sound.

I would suggest a 600 ohm isolating transformer on each leg, available from Radio Spares or Maplins.