Reconstructing A Novice Single 5763 Single Tube Xmtr

Discussion in 'Homebrew and Kit Projects' started by KA0HCP, Jan 5, 2019.

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  1. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    Mikrowave1 gives us this fresh gem of a video, reconstructing a Novice single tube transmitter using a 5763 tube. Loads of great tips.

    K7TRF, AD5HR, VK4HAT and 1 other person like this.
  2. AD5HR

    AD5HR Ham Member QRZ Page

    Cute little keyed osc., but I prefer the MOPA circuit, easier on xtals.
    I built my HB rig using the W1TS circuit in the Oct. 1968 QST.
    This was also the circuit in the "Two Tube Tuna Tin Two" in the
    Jan. 2003 issue.
    Plate modulated by push-pull 6AQ5's, I get 5 to 6 watts of 75M. A.M., and
    get about 75W. out driving the S.B. 221.
    My rig was a real "ugly weekender", dug up all the parts from my
    large "junkbox" (no new parts, all recycled, used) on a Sat., and had it
    on the air at 4:30 P.M. on Sun.
    On the air nearly daily since Jan. 8th, 2008 with no failures.
    Not quite a Novice rig, unless I leave it in CW mode?
    KA0HCP likes this.
  3. W1BR

    W1BR Premium Subscriber QRZ Page

    It would not be outrageous to see an tube similar to a 5763 as the oscillator in a MOPA design; I doubt crystal current would to serious an issue in that design. At least he used a Colpitts, and not a TriTet with an 807. :D Nice feature of a MOPA is that one can include delayed keying (differential) on the PA to reduce chirp at key down.

    That guy did a nice job constructing that radio; it is obvious he takes pride in his work. Nice to see good examples of well done homebrew gear.

  4. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    Can you share any photos? :)
  5. K6BSU

    K6BSU Ham Member QRZ Page

    Not AM, but just CW. Back when I was playing with QRP, I built this little Tx. 12AX7 is VFO and buffer. Final is pair of 6AQ5 in parallel. Lower deck contains a DC-DC converter so the Tx can run from 12V DC.

    Attached Files:

    AD5HR likes this.

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