[HAM] Does the BC have a volume gain?

[Toussaint]

Thanx for the info Dave, I'll pass this email to the owner, then he'll hire 
a hammond tech to attend to the organ..
I wasn't there when he worked on it before, so now your instructions will be 
his checklist.

"T"< player player
----- Original Message ----- 
From: "Dave Bishop" <xxcaptinxx at comcast.net>
To: "The Hammond Forum" <hammond at zeni.net>
Sent: Wednesday, January 17, 2007 9:56 PM
Subject: Re: [HAM] Does the BC have a volume gain?


> There are lots of places where changes in passive components could cause 
> low
> pre-amp output.  I guess I'd spray the rheostat with De-Oxit to clean off
> the contacts, then check resistors for drift.  There is a 20K and a 140K
> under the matching transformer shield, a 140K in the rheostat box and a 
> 150K
> under the pre-amp chassis that I'd look at first.  There should also be a
> 100K tone pot that you can clean and rotate.  If you are actually loosing
> bottom end, you might try replacing the .25 cap in the rheostat box.  You
> could swap the 57 tube if you can find a replacement.  Its a fairly
> straightforward project to rebuild the pre-amp, replacing the caps as
> needed.  You might see an improvement in the tone, as well.
>
> Regards,
>
> Dave Bishop
>
>
> --
> Subscription Options/Unsubscribe/Archives: http://www.zeni.net/hf/
> Hammond-Leslie FAQ: http://theatreorgans.com/hammond/faq/
> HammondWiki: http://www.dairiki.org/HammondWiki/
> hammond at zk3.dec.com archives: http://zk3.hammondforum.com/
>