Restoration of the R-390A

Discussion in '"Boat Anchor" & Classic Equipment' started by SV2SBE, Nov 28, 2019.

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  1. SV2SBE

    SV2SBE Ham Member QRZ Page

    78085343_10217769821988808_1650273280055050240_n.jpg 78489357_10217769822548822_3059899619824631808_n.jpg 78546338_10217769823028834_7201452234494705664_n.jpg 78998456_10217769822068810_1408609420362907648_n.jpg

    Recaping of the AF and If module finished. Now need to made the multi capacitors on the AF and change the 50mf bathtub on chassis and the 2mf on the IF module.
    KB2FCV and W7UUU like this.
  2. K0UO

    K0UO Platinum Subscriber Platinum Subscriber QRZ Page

    Very nice job
  3. W7UUU

    W7UUU Principal Moderator Lifetime Member 133 Administrator Volunteer Moderator Platinum Subscriber Life Member QRZ Page

    You're an amazing craftsman working on such a complex machine. Great work!!


  4. WA1GXC

    WA1GXC Ham Member QRZ Page

  5. KB4MNG

    KB4MNG Ham Member QRZ Page

    I've done a few sucessful refurbs but I would be in the deep end of the pool on that one.
  6. KL7KN

    KL7KN Premium Subscriber QRZ Page

    You are a better man than I . Used to get paid to work on R-390s (USAF radio maint) . The gearing alone is enough to drive me nutz. Hated them....
  7. SV2SBE

    SV2SBE Ham Member QRZ Page

  8. SV2SBE

    SV2SBE Ham Member QRZ Page

    have to say that the IF unit was more difficult from the RF unit. The RF is a lot of gears, springs, bolts, fasteners etc. If you are taking photos, and read good the manual and the internet help files, it;s not so complicated. The if unit from the other side, there is some capacitors, 10-15 i didnt count them, but they are stiff between other parts. You have to make magicians and broke your fingers to unsold them. And the biggest drawback, all the terminals, ALL are twisted in all the holes they go through. So you cant just heat and pull the part. You have to cut the part, remove it, use de-solder pump to suck the solder, then use some very fine pliers and dentist tools to untwist and remove the piece of wire that its attached on the hole. That was 3 days work, around 5-6 capacitors per day, and then patience ended!!!
    WB2GCR likes this.
  9. SV2SBE

    SV2SBE Ham Member QRZ Page

    Recaping continue, Now with the bathtub capacitor on the chassis and the two multi capacitors on the AF chassis

    79420991_10217775336326663_1644535397021122560_n.jpg 78412896_10217775337086682_8565183270998769664_n.jpg 80217322_10217775336526668_3304730678595158016_n.jpg 79083207_10217775337166684_6414588146826084352_n.jpg Waiting for the black glue to harden, trim it and add some silver paint

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    Like the original!!!

    Attached Files:

    KA0HCP and KL7KN like this.
  10. W1BR

    W1BR Premium Subscriber QRZ Page

    Nice professional workmanship! I can handle the electronics, but that gearbox restoration is beyond my pay grade and patience levels!!! Thanks for sharing.

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