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  1. Tech5

    Help with RX/TX relay

    Hi guys! Working on a Royce 642 and thanks to @Shummy that shared the service manual my life became much easier. First thing was to fix a bad power switch which was an easy task since the switch is a DPDT and only one pole was used, which was burnt, but the other one was as new. The TX/RX...
  2. Tech5

    Old RF amplifier Effect SA-1

    Does any of you have any experience with this type of Effect SA-1 amplifier? These were manufactured in the early 70's and back then the price tag was set at around 60 USD. The SA-1 has a pair of 12JB6 tubes but some of these amps had 6JB6; which the only difference is the filament voltage; 12...
  3. Tech5

    Service manual President Jackson PCB PB-042AE

    Hi! I am looking for a service manual for a President Jackson, which can be seen in the attached photos, and I have tried hard to find it, but to no avail. My friend, who is the owner of the radio, says that it intermittently refuse to switch to TX. There is, as he said, not the microphone...
  4. Tech5

    CRT Hercule display board

    Hi and first post here! I have a CRT Hercule on my workbench that has had the display slightly modified. Someone has replaced the background illumination from the original light bulbs to leds, but it does not work as intended. I found a service manual on the web but the display schematic is not...
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