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Heathkit SB-230 Relay

Discussion in 'Amateur Radio Amplifiers' started by KD9DDE, Jan 12, 2021.

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  1. KD9DDE

    KD9DDE Ham Member QRZ Page

    Hello all
    I am in need of a relay for the SB-230 Linear Amplifier
    Heathkit part # 69-55
    Any information where I might find one would be appreciated
    73 Bob
    KD9DDE
     
  2. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

  3. KD9DDE

    KD9DDE Ham Member QRZ Page

  4. KD9DDE

    KD9DDE Ham Member QRZ Page

    Thanks a lot
    Ordered one today

    73
    Bob
     
  5. W1QJ

    W1QJ Ham Member QRZ Page

    Actually it’s NOT the same as in the SB220. It’s more like the same one in the SB200!! Yes it’s 120vdc but it’s bigger and a 3pdt whereas the 230 relay and 200 relays are DPDT and smaller. Since the coil plays a part in the bias there may be an issue with bias because of the difference of impedance of the coil. Will probably work but it’s certainly not the same.
     
  6. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    That's interesting.

    I remember the SB200 relay is DPDT and the SB220 is 3PDT, but the last SB230 I looked at (years ago) was also 3PDT just like the SB220, and they did not use one set of contacts; so, it was a 3PDT used like a DPDT and it sure looked original.

    Maybe someone had replaced it before I looked at it. I made a note in my "repair notes" which is all hand-written (!) over many years that the 230 used a 3PDT with only two poles connected and figured that's the way they all were.
     
  7. KD9DDE

    KD9DDE Ham Member QRZ Page

    Thanks for your reply. The original relay in the SB-230 I have is a 3pdt relay. They do not use the center section of the relay. My original assembly manual also shows a 3pdt relay. Perhaps they switched at some point to improve the bias on the output tube. 3pdt relay.jpg relay.jpg
     
  8. KD9DDE

    KD9DDE Ham Member QRZ Page

    Thanks for the update. You are correct. My original unit comes with the 3pdt relay. Perhaps they switched to improve the bias on the output tube. See photos on previous reply
     
  9. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    That's what I remember, also.

    They may have actually switched the other way around, starting out with a DPDT because that's what was in the SB-200, then switching to the 3PDT because the SB-220 was a newer model and in current production, so they just used a common relay for the 220 and 230.
     
  10. W1QJ

    W1QJ Ham Member QRZ Page

    The schematic shows a dpdt but I’m saying that the Harbach replacement will be larger in size.
     

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