OK that explains it Jim, I thought you bought it with those markings on it.
The poor response on the small section shows it wasnt designed for a good
minimum capacitance which would be a problem on 10M with several tubes.
I got one of those from OEP as a "sample", rebuilt it with a bit less C per
section but 6pf min C on the small one, returned it, and had them make
several runs for me of 10-20 at a time. They sold well.
Carl
KM1H
----- Original Message -----
From: "Jim Garland" <4cx250b@miamioh.edu>
To: "'Carl'" <km1h@jeremy.mv.com>; <amps@contesting.com>
Sent: Wednesday, June 25, 2014 7:07 PM
Subject: RE: [Amps] dual section cap
Carl,
I remeasured the cap, and the two sections are 17-63pF and 24-316 pF,
pretty
much what I had measured before N years ago. A single section cap on the
same frame would be 379 pF, or maybe a smidgen more since there would be
coupling between two plates that are separated in the dual-section
version.
I used a good quality cap meter and compensated for the lead capacitance.
73,
Jim W8ZR
-----Original Message-----
From: Carl [mailto:km1h@jeremy.mv.com]
Sent: Wednesday, June 25, 2014 4:00 PM
To: Jim Garland
Subject: Re: [Amps] Buck-Boost Transformer Selection
Jim, that OEP cap of yours got me looking and it appears that somebody
used
the full value for that frame. IE; the Cardwell 154-10 is rated at 347pf
and
that frame length was used for the dual section.
Carl
KM1H
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4592 / Virus Database: 3986/7744 - Release Date: 06/25/14
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|