[R-390] 1967 EAC S/N 4998 Cosmos PTO Question

[Gary I. Biasini]

Jacques,

Thanks to you and to the others that responded.  

I wasn't very clear in my original message.  On the picture, where I
expected to see the adjustment screw after having removed the cover screw,
there was instead what looked like a red rubber washer.  I decided that I
would try to remove it with a dental pick but only ended up shredding the
washer.  Once enough of the washer was out, I could see the adjustment
screw.  After adjusting it twice for 1 1/2 turns in total, the endpoint
remains 7KHz long, i.e. no change at all.

I was  hoping that I wouldn't have to open up the PTO and remove a turn from
the particular coil as noted in the various articles.  I recently saw an old
post (maybe on the PTO Pearls document) where the contributor mentioned that
when he replaced the capacitors in the PTO (I think they were temperature
compensating capacitors) the end point adjustment worked without having to
take a turn off the coil.  I am going to look for that post hope I can find
that again.

Unfortunately, my time to work on the 2 - R-390a receivers that I have in
Arizona has come to an end.  When I next get back here in mid-March, I hope
to have more time.

Again, thanks to all that have helped.   I truly appreciate it.

Gary

-----Original Message-----
From: Jacques Fortin [mailto:jacques.f at videotron.ca] 
Sent: Tuesday, February 20, 2018 1:55 PM
To: 'Gary I. Biasini' <gary.biasini at shaw.ca>
Subject: RE: [R-390] 1967 EAC S/N 4998 Cosmos PTO Question

Look at the attached.
Good luck.

73, Jacques, VE2JFE

-----Message d'origine-----
De : r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] De
la part de Gary I. Biasini Envoyé : 20 février 2018 15:36 À :
r-390 at mailman.qth.net Objet : [R-390] 1967 EAC S/N 4998 Cosmos PTO Question

I recently added a 1967 EAC S/N 4998 to my radios.  It was a bit dirty but
otherwise seemed in good condition and the purchase included the screwdriver
and bristo drive.  

 

In checking the PTO however, it was about 5 KHz long so I decided to align
the endpoints.  Unfortunately, when removing the cover screw, I didn't see
an adjustment screw.  The picture at the link below shows what I found.  Any
help as to what to do next would be greatly appreciated.

 

https://1drv.ms/u/s!AhXaYQRsUlJ0gclJ7iti9grLEpfMxg

 

Regards,

Gary

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