Another Faulty Ameritron AL-11H

Discussion in 'Amateur Radio Amplifiers' started by G3YRO, Aug 5, 2017.

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  1. G3YRO

    G3YRO Ham Member QRZ Page

    Yes, on the EARLY AL-811 H they just use one open Relay, rather than two sealed ones.

    So you can easily check it !

    Roger G3YRO
  2. KA9JLM

    KA9JLM Ham Member QRZ Page

    Did they change the design because operators were burning out the key circuit in their radio ?

    Some Ameritron amps recommend using their external keying interface.
  3. G3YRO

    G3YRO Ham Member QRZ Page

    Possibly . . . although the later relays are probably cheaper !

    But the 2 relays are not only driven by transistors, they are also independently timed (as pointed out to me).

    Roger G3YRO
  4. WB1E

    WB1E Ham Member QRZ Page

    Excellent thread Roger, but this amp is going back to Ameritron, then for sale.

    I did trace the Filament back through the TX/RX no issues there, to the traces on the PCB that is. Never did look for any output, but this was a last ditch attempt. But the B+ is there at the anode. No hum from within. Would of loved to start over fresh, but W8JI's bias design to prevent the newer 811a's from flashing over I understand had to be done. But to put everything on one non removable board ARRRGGG. The Dentron stuff is much better as far as the "Quicky Stop" amps are concerned.


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