[R-390] Question for Historians

Tue, 22 Apr 2003 21:38:35 EDT

In a message dated 4/22/2003 8:21:54 PM Central Daylight Time, 
[email protected] writes:

> GE List.  I'm working on a very nice Capehart 1961 contract.  All modules
> are Capehart except the P.S.(Stewart-Warner) and the PTO(Progestron).  Did
> Capehart ever make its own P.S. or PTO?
> 
> A techincal question - the PTO seems to be very sensitive to vibration.  I
> know this PTO is built like the Collins but, don't recall a Collins PTO
> being this sensitive.  I swapped out the 6BA6 and it helped some but, the
> sensitivity to vibration is still there.  Its like the grids in the tube 
> are
> vibrating or a bad ground(I hope not).
> 
> Thanks List
> Dave Faria
> 

No, they did not make their own pto's. 

The only pto manufacturers were....Collins, Motorola, Progressitron, Dubrow 
Electronics and Cosmos.

The vibration probably is likely a bad solder joint on one of the minicaps 
(forget the capacitance) I have had three progressitron pto's and all three 
had the same problem. A slight jarring would make it change frequency. Took 
it apart and lo and behold, a solder joint was making intermittent contact. A 
quick reflow and it was working like new. ymmv.

Les Locklear

--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment.  Attachments are not allowed.  To learn how
to post in Plain-Text go to: http://www.expita.com/nomime.html  ---