[R-390] Cosmos Drift

[Scott Bauer]

  I bought 120 5749's all from the Philips contract dated 1987. These 
tube have been
giving me a lot of trouble in the PTO as well as V505 (a) V508 non a. 
The tube will
work fine for the first 40-60 hours and then start acting up. Any body 
want to but some
NOS tubes? :-)

Cecil Acuff wrote:
> Still got a 3TF7 in it....or another solution such Kielbasa.
>
> Could be power line fluctuations, room temp changes.  You are not 
> running the ovens are you....shouldn't be...
>
> Might be the tube but I've heard of more problems with new tubes in 
> PTO's than well seasoned ones...
>
> Cecil...
> ----- Original Message ----- From: "Jon" <jonklinkhamer at comcast.net>
> To: "R-390 at Mailman. Qth. Net" <r-390 at mailman.qth.net>
> Sent: Wednesday, August 30, 2006 4:03 PM
> Subject: [R-390] Cosmos Drift
>
>
>> Hello to the group, hope everyone is having a great summer.
>>
>> If I had to write about my summer vacation at 44, I would tell the 
>> class how
>> I performed major surgery on a Cosmos PTO. How every night I turned 40
>> screws,that are the size of an ant with a homebrewed tool, which 
>> sometimes
>> caused havoc in restricting the turning of the shaft to messing up 
>> the end
>> points, to interaction between other cal points, how I must of taken 
>> apart
>> that $#%#$ thing 14 billon times. It is truly amazing that it is still
>> working. Sorry, I had to get that out of my system. Now I was curious on
>> what I will call long term drift. After installation of the PTO into the
>> radio with it connected to a freq counter, I let it warm up for 48 hours
>> before I cal'd it. After which, I brought it back to the set point in 
>> this
>> case, 3.455000Mhz and let it sit. It is now over 3 days and the PTO has
>> drifted over 1000Hz increasing in frequency. It seems to me that it 
>> will not
>> settle out like I thought it would. I was wondering if anyone else has
>> experienced this or knows any 'quick' remedies. I would appreciate any
>> comments at all. Thanks for the bandwidth!
>>
>> 73,Jon
>>
>>
>>
>> _____________________________________________________________
>> R-390 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>> Help: http://mailman.qth.net/faq.htm
>> Post: mailto:R-390 at mailman.qth.net
>> Unsubscribe: http://mailman.qth.net/mailman/options/r-390
>>
>
>
> _____________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/faq.htm
> Post: mailto:R-390 at mailman.qth.net
> Unsubscribe: http://mailman.qth.net/mailman/options/r-390
>
>