[R-390] R-290a modified IF sub-chassis

[Renee K6FSB]

Hi Gary-
Welcome. beware of kielbasa and umpucky...... you really had me with an 
R290a!
nothing new on mixed chassis mfg.
interesting ......looks like you may have some reverse engineering 
ahead. hope someone recognizes the bugger......inquiring minds want to 
know more.....
Renée, K6FSB

On 2017-09-03 05:17 PM, Gary I. Biasini wrote:
> Good Day.  This is my first post as a member so I hope I don't run afoul of
> any of the rules which I have carefully read.
>
>   
>
> I recently purchased what purports to be a Teledyne Systems R-390a Serial
> number 2697.  I say "purports to be" because the various sub-chassis are as
> follows:
>
>   
>
> RF sub-chassis - Capehart Corporation Order No. 21582-PC-61, Serial no. 585
> Crystal Oscillator sub-chassis - Capehart Corporation Order No. 21582-PC-61,
> Serial no. 626 IF sub-chassis - Capehart Corporation Order No. 21582-PC-61,
> Serial no. 808 Power Supply sub-chassis - Capehart Corporation Order No.
> 21582-PC-61-A1-A1, Serial no. 713 Audio sub-chassis - Teledyne Systems Corp.
> Order No. 37856-PC-63 PTO - Progressitron Corp. Type 798 Serial No. 8703
>
>   
>
> I purchased the receiver from William Pearl, a formerly licensed ham
> operator living in the Long Beach, CA area.  I happened to be in the Phoenix
> AZ area at the time I agreed to purchase it so my wife and I drove out to
> meet Bill and pick up the receiver in person.
>
>   
>
> Bill advised that he obtained the receiver more than 30 years ago from
> another ham and, after children arrived, it sat in his garage unused for 30
> years.  He said he turned it on prior to selling it and, with a short wire
> antenna, it picked up some stations.
>
>   
>
> I have carefully read the admonitions against turning on the receiver until
> a few things are checked out and replaced like C553 and, have ordered
> replacement caps for all of the paper capacitors and others that are
> recommended and will hopefully find time to replace them in the next few
> months.  In the meantime, in looking at the receiver, it appears that a
> number of modifications were made, some of which I cannot seem to find in
> the archives.
>
>   
>
> This first message will discuss the modifications that I have noted on the
> IF sub-chassis.  In particular, I note a 1,000 uF 25VDC electrolytic
> capacitor and an unknown device with 8 leads exiting the body.  I assume
> that this is some sort of AGC modification.   Any comments would be welcome
> and any questions will be answered to my ability.
>
>   
>
> The URLs to pictures of the modified module are below:
>
>   
>
> https://1drv.ms/i/s!AhXaYQRsUlJ0gbU1YrERkfud0axItQ
>
>   
>
> https://1drv.ms/i/s!AhXaYQRsUlJ0gbU5K1--TAXeKe4ZgQ
>
>   
>
> Thank you in advance for any comments.
>
>   
>
> Gary Biasini
>
>   
>
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