Vacuum tube based cw keyer

Discussion in 'Homebrew and Kit Projects' started by SQ8LUV, Jan 12, 2021.

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  1. SQ8LUV

    SQ8LUV Ham Member QRZ Page

    Hi guys,
    I'm looking for a valve based cw keyer schematic. There is two double triodes and two stabilivolts inside. Originally constructed by some american ham, don't remember a callsign. It looks like that if it helps:
    Link to a photo
    Will be grateful for any help.

    Happy New Year,
    Chris, SQ8LUV
  2. WA9FZB

    WA9FZB XML Subscriber QRZ Page

    It could be a variation on the circuit that was in the ARRL Handbook back in the 1960's. I think that one used 3 each, 12AX7 double triodes or something like that. Might be worth a search there. . .
  3. W4DIP

    W4DIP Ham Member QRZ Page

    ...and is in fact on page 254 of the 1960 Handbook, and uses two 6CG7 tubes and one relay, so it's not the same as the picture in the posted link.
  4. W1VT

    W1VT Ham Member QRZ Page

    CQ Magazine did a lot of technical articles at that time.
  5. K3XR

    K3XR Ham Member QRZ Page

    You could do a search for the manual or schematic for the Hallicrafters TO keyer.
    W1BR likes this.
  6. NW2K

    NW2K Ham Member QRZ Page

    W9TO, hence TO Keyer. Check the West Coast Radio Handbook too.
    K3XR likes this.
  7. W5UAA

    W5UAA Ham Member QRZ Page

    QST, March 1967, "A Single-Tube Electronic Keyer", page 40.

    12AU7 in astable multivibrator configuration and an 0B2 voltage regulator. Uses three relays, RC time constant and two potentiometers for weight (they call it a divider) and speed.

    I built one of these a couple years ago.

    Love it. I especially love the clicking and clacking of the relays.
  8. KX4OM

    KX4OM Ham Member QRZ Page

    I also built one of those. No chassis, no wooden board, just 3-D point to point wiring and components to see if it worked. I carried it to class in a paper bag at ET-B School at Treasure Island in 1972. The other guys at K6NCG, our ham club got a kick out of it.

    Ted, KX4OM
    W1BR and KA0HCP like this.
  9. SQ8LUV

    SQ8LUV Ham Member QRZ Page

    Thank You for replying so much,
    I'll check it out.
  10. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    @SQ8LUV Here is a list of QST tube keyer projects.
    Last edited: Jan 14, 2021 at 12:51 AM

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