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SB-200 Looking for the T/R relay? Harbach sold out.

Discussion in 'Amateur Radio Amplifiers' started by KD0SGX, May 10, 2020.

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  1. WA7PRC

    WA7PRC Ham Member QRZ Page

    His ads state "Parts list and instructions are sent via email after your purchase when you email me ...". He also supplies a link to a BOM on Mouser's website. I needed no photos or video to assemble and install his SB-220 board.
    The @W7RY system isn't very complicated.
    That's the cheapest way out. :)
  2. KD0SGX

    KD0SGX Ham Member QRZ Page

    Well if we can't source another relay may have to go that route with the board and the QSK kit.
  3. K7RJB

    K7RJB Ham Member QRZ Page

    It looks like RFparts has them in stock
  4. KD0SGX

    KD0SGX Ham Member QRZ Page

  5. W1QJ

    W1QJ Ham Member QRZ Page

    Contact me at and I’ll see if I can get you a good used relay.
  6. W1QJ

    W1QJ Ham Member QRZ Page

    Looks like RF parts has new ones.
  7. W9GB

    W9GB Ham Member QRZ Page

    Potter & Brumfield Relays, Catalog #100, circa 1967 (Bunker of Doom)
    The P&B “KA” series was like the original Heathkit relay.
    The P&B “KT” series was designed for T/R Antenna Switching (5A rating)

    Potter & Brumfield Relays are now part of TE Connectivity (Mouser distributor)
    KUM/KUMO series
    Old ECG replacement RLY1425 is SPDT, 10A, 120 VAC coil.
    Harbach replacement was DPDT
    Last edited: May 12, 2020
    W1TRY likes this.
  8. W1QJ

    W1QJ Ham Member QRZ Page

    Jim’s sb200 QSK isn’t as easy as the SB220. The sb220 is easy. You don’t have to change bias per se’ nor ground the grids. On the SB200 you have to ground the grids and rewire the metering system. Not so easy.
    KD0SGX likes this.
  9. KD0SGX

    KD0SGX Ham Member QRZ Page

    Those are great facts I am not sure I understand where to get one from?
  10. KD0SGX

    KD0SGX Ham Member QRZ Page

    really want a new one.

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