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R-390A IF Module - cracked caps

Discussion in '"Boat Anchor" & Classic Equipment' started by WB2GCR, Jan 3, 2019.

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  1. WB2GCR

    WB2GCR Ham Member QRZ Page

    Here's the IF module from my #2 R-390A, a Stewart Warner.
    Opened it up to replace the bad 8kc filter with another one.
    Found all of these brown 0.1ufd 200vdc caps cracked. Four total. Or is it 5?
    Interestingly, the IF strip still worked...

    FYI.




    CRACKED CAP IF MODULE.JPG
     
    K1LKP likes this.
  2. K9STH

    K9STH Platinum Subscriber Volunteer Moderator Platinum Subscriber QRZ Page

    Those are the famous "brown beauty" paper capacitors which are virtually as bad as the "black beauty" paper capacitors.

    You really need to replace all of both types of capacitors if in any of the Collins design receivers. Also, if you have not already replaced all of the electrolytic capacitors, I sincerely recommend that you replace them as well.

    Glen, K9STH

    technical adviser-1a.jpeg
     
  3. WA6SW

    WA6SW Ham Member QRZ Page

    Mine are all yellow.
    800_8318 copy.jpg
     
  4. WB2GCR

    WB2GCR Ham Member QRZ Page

    Yellow - good - film! :D
     
  5. KC8VWM

    KC8VWM Ham Member QRZ Page

    Interesting how some R390A's use those brown beauties and others use Vitamin Q's in the same cap location.
     
    K1LKP likes this.
  6. K1LKP

    K1LKP Premium Subscriber QRZ Page

    CHARLES,
    HERE IS SOME GOOD SCOOP ON THE R 390 A
    R390 A HISTORY.jpg
    https://en.wikipedia.org/wiki/R-390A

    I WAS FORTUNATE TO OPERATE
    THE R 390A DURING THE EARLY 60'S.
    I WAS A RADIOMAN ON AN OLE
    DIESEL SUBMARINE OUT OF
    GROTON, CT.
    WE ALSO HAD THE COLLINS URC-32 XCVR.

    73 - K1LKP
     
    KC8VWM likes this.
  7. KC8VWM

    KC8VWM Ham Member QRZ Page

    That's pretty cool Carmen and I appreciate your service. :)

    I restored a few of these and the R-390A is on my list of favorite radio receivers.

    73 - Charles KC8VWM
     
    K1LKP likes this.
  8. K1LKP

    K1LKP Premium Subscriber QRZ Page

    CHARLES,
    THANK YOU FOR YOUR
    KIND WORDS REGARDING
    MY SERVICE.

    I TAKE MY HAT OFF TO YOU
    FOR RESTORING SOME R-390A'S.
    I RECALL THE FIRST TIME I GOT INTO
    THE CHASSIS OF THE R-390A I WAS
    OVERWHELMED WITH ITS
    COMPLEXITY.
    Hats_off[1].gif

    N9HI_Have_a_Nice_Day.gif
     

    Attached Files:

    KC8VWM likes this.

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