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Post by dollabill on Mar 30, 2021 10:06:59 GMT -5
Hello everyone, maybe someone could help me figure out my no transmit problem, it was working fine and last week I lost transmit, so I shut everything down and opened top and bottom covers and looked for anything burnt or bad, did not see anything suspicious so I powered radio back up and it was transmitting again, after one day of a few key ups, I was in the middle of transmitting (talking) it just unkeyed by itself losing transmit again and ever since I cannot get radio to keyup again, I replaced the 7558 tube with a 70% good tube because when I checked the one I took out there was no reading at all on the tube tester, I'm so confused about this, I want my radio back up and working. Please anyone can help me? Thanks for all input
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Post by 2600 on Apr 1, 2021 1:09:47 GMT -5
Does the radio go "click" when you key the mike?
If not, it's probably time for a 50-year tuneup. Starts with the electrolytic capacitors in the radio. When they fail, the power supply voltage falls too low to operate the coil of the transmit relay.
Might be other problems as well. You found one tube that checked bad. Sounds like checking the rest of them would be next.
73
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