Adjustment of Onboard E1 Circuit on 370RM

admin · Post by **admin** » Sat Dec 02, 2006 6:07 am

Here is a question from the RickResource Forum Mailbox from Spain.

Hello Peter.
My name is Juan. I am a big fan of the rickies.
I have 4 of them. The last one is a Roger Mcguinn signature model.

I would like to know how can I modify the level of compression on board. I can not find the trimmer to adjust the amount of compression.
Thank you very much. Happy New Year, from Spain

Juan

johnhall · Post by **johnhall** » Sat Dec 02, 2006 12:34 pm

If you look closely, you'll see three tiny holes in the circuit board. Two are empty but behind one of them is the pot; the screwdriver goes through the hole in the board to adjust it. There's also a pin sticking out in the same area to clip a voltmeter, as these were adjusted to spec- as I recall 1.5v DC from the pin to ground. But of course you can do it to your taste.

Those other two holes are interesting. Each of those is for a pot and you'll see the mounting pads in the circuit board around them. But stock units use two resistors instead of the pot, a fixed voltage divider arrangement. They would be adjustable gain controls if they had a pot in them and we installed the pots in a few guitars for use by pros.

admin · Post by **admin** » Sat Dec 02, 2006 1:19 pm

Thanks John. This is great information.