[Collins] Identifying BBs

Dave Brown [email protected]
Wed, 31 Mar 2004 22:24:51 +1200


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.
>