[Collins] Identifying BBs

Wed, 31 Mar 2004 07:41:34 -0500

Yup, Replace those Black Beauties and that brown electrolytic.

Jim
----- Original Message ----- 
From: "Dave Brown" <[email protected]>
To: <[email protected]>
Sent: Wednesday, March 31, 2004 05:24
Subject: [Collins] Identifying BBs

> Not sure if these black fellas are what I think they are-if someone can
> confirm, I'll have 'em replaced in a jiffy.
> http://homepages.ihug.co.nz/~tractorb/suspect%20caps/x608.JPG
> Tnx
> Dave, ZL3FJ (having a great time getting a 32RS-1 up and running again)
> 
> ----- Original Message ----- 
> From: "Dr. Gerald N. Johnson, electrical engineer" <[email protected]>
> To: "Thomas Beltran" <[email protected]>
> Cc: <[email protected]>
> Sent: Wednesday, March 31, 2004 4:37 PM
> Subject: Re: [Collins] 75A-4 - burnt resistor question
> 
> 
> > Black Beauty capacitors were leaky 25 years ago. They aren't worth
> > testing, they should be replaced with orange drops en masse. Likely
> > others are also leaking, especially screen bypasses causing low stage
> > gains and low sensitivity. And then leaky AVC bypasses are causing poor
> > AVC. The audio coupling capacitor is causing the audio output stage to
> > draw excess current leading to shortened tube life. REPLACE THEM ALL!
> >
> > 73, Jerry, K0CQ, Technical Advisor to the CRA
> > -- 
> > Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
> > Reproduction by permission only.
> >
> 