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Hello- I have an unusual problem perhaps someone could shed some light on: I have a TR-4 in 29K serial range that functions normally except it will not go back into receive, until after approx 30 second delay, after the mic button is released or the function switch turned back to "SSB". This condition worsens (longer delay) the more you frequently you transmit. The sidetone disappears but T-R relay will not release. I have tried different known-good 6EV7 tubes, have replaced a lot of the coupling / bypass caps in T-R circuits, did resistance / voltage checks, adjusted the VOX / VOX delay controls, tried other tubes in T-R circuit, etc. to no avail. What is real curious about this is that while waiting for it to go back into receive and T-R relay is engaged, IF YOU PULL THE 6EV7 FROM ITS SOCKET THE T-R RELAY STILL DOES NOT RELEASE. I suspect the issue is with the lead that goes from T-R relay coil to pin #1 on 6EV7 (somehow allowing enough leakage to ground?) or could it be the T-R relay coil itself I made sure socket / pins and all are clean on 6EV7.    N   R

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ÇåÐìÇÌ·ÐÂÔͶ×ÊÓÐÏÞ¹«Ë¾   W Hello- I have an unusual problem perhaps someone could shed some light on: I have a TR-4 in 29K serial range that functions normally except it will not go back into receive, until after approx 30 second delay, after the mic button is released or the function switch turned back to "SSB". This condition worsens (longer delay) the more you frequently you transmit. The sidetone disappears but T-R relay will not release. I have tried different known-good 6EV7 tubes, have replaced a lot of the coupling / bypass caps in T-R circuits, did resistance / voltage checks, adjusted the VOX / VOX delay controls, tried other tubes in T-R circuit, etc. to no avail. What is real curious about this is that while waiting for it to go back into receive and T-R relay is engaged, IF YOU PULL THE 6EV7 FROM ITS SOCKET THE T-R RELAY STILL DOES NOT RELEASE. I suspect the issue is with the lead that goes from T-R relay coil to pin #1 on 6EV7 (somehow allowing enough leakage to ground?) or could it be the T-R relay coil itself I made sure socket / pins and all are clean on 6EV7.    T

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   M OK. Relays take more coil current to "pull in" than they do to "hold in". It takes a certain amount of current through the coil (pull) to drag the armature from it's non-energized position to the energized position. It takes much less current to (hold) it once there, so slight leakage might NOT be sufficient to pull, but more than enough to hold.    Q

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