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  1. D

    Siltronics LA-550 " keying relay issues"

    Looks like the diode is indeed shot !
  2. D

    Siltronics LA-550 " keying relay issues"

    I am also not sure that cap is good at c13 but I did not remove it when I did the test yet but the ohm meter never went to LO and it didn't climb nice and easy like a goo cap would
  3. D

    Siltronics LA-550 " keying relay issues"

    15.55 volts AC on the cathode and the same at the anode, either side shows anything DC related
  4. D

    Siltronics LA-550 " keying relay issues"

    I also then tried to check C13 for a short but I am not positive on how to do that I am sure I can look it up, it did not beep on continuity on my ohm meter but it did show 259 ohms ?
  5. D

    Siltronics LA-550 " keying relay issues"

    Hi, here are my findings I checked the cathode at D6 with all tubes removed and the most I saw was 2 volts dc and it would quickly drop off to nothing, so I lifted the cathode side and checked the cathode side again and still had nothing, I also checked the spot where the cathode was soldered to...
  6. D

    Siltronics LA-550 " keying relay issues"

    The 8950 is buzzing though and doesn't seem quite right to me, there is also a slight bit of blue coloring in it at top and bottom , I have tried 2 different 8950 and both did it i have a feeling somthing is shorted out in this amp causing both issues but I could be wrong too, I have to work...
  7. D

    Siltronics LA-550 " keying relay issues"

    Yeah, the driver tube is still a 8950
  8. D

    Siltronics LA-550 " keying relay issues"

    Absolutely, I will check all this, and yes the power lamp and all the tubes are lit but the driver tube sounds like it is buzzing a bit
  9. D

    Siltronics LA-550 " keying relay issues"

    I was testing wires at that keying relay while I was trying to key up and the only wire I had any power to speak of really was the larger orange one which had 24 VDC in it at all times, none of the other wires had anymore than 1v
  10. D

    Siltronics LA-550 " keying relay issues"

    Yes sir I will check everything mentioned above, but what I meant is I never see 16 volts in that yellow/green white wire at all even with the switch on low or high even if I key up. The power supply or coil I was referring to is very little not the large power supply. I believe I installed the...
  11. D

    Siltronics LA-550 " keying relay issues"

    Hi, I have been working on this quit a bit trying to figure out what is going on with it, there is a green and yellow wire that runs to the bypass, low, and high power switch and it shows in the schematic that this wire should have 16v and it has hardly anything at all, I also check the 250 uf...
  12. D

    Siltronics LA-550 " keying relay issues"

    Hi, I have been working on this quit a bit trying to figure out what is going on with it, there is a green and yellow wire that runs to the bypass, low, and high power switch and it shows in the schematic that this wire should have 16v and it has hardly anything at all, I also check the 250 uf...
  13. D

    8950 tube ??

    And the tube is NOS
  14. D

    8950 tube ??

    8950 I meant sorry
  15. D

    8950 tube ??

    I got the job all finished and it turned out well but the units keying relay is not working, I also notice a buzzing sound and it sounds like it is coming from my driver tube and I see a very slight blue color in the bottom of the tube, I have 5 tubes toltal so I am using a 8905 tube for the...
  16. D

    Siltronics LA-550 " keying relay issues"

    Also, the component board # is 038 070 I don't know if you were asking that for that number earlier or the metal transistor
  17. D

    Siltronics LA-550 " keying relay issues"

    Also, should the zener diode which is currently installed have continuity because it does not, if any of the components need to be removed to test I sure will do so ! Thanks
  18. D

    Siltronics LA-550 " keying relay issues"

    The part # on that metal transistor is 2N3053 you can tell someone has messed with both transistors on the back of the board from the flux stains, I did have a temporary fix on that broken trace I am pointing at until I removed that transistor, I did a continuity test on all 3 legs and didn't...
  19. D

    Siltronics LA-550 " keying relay issues"

    Yes, I see exactly what you mean now, the schematic has 2 2N5814, I didn't even notice that until you mentioned it ! I am not the best at reading them
  20. D

    Siltronics LA-550 " keying relay issues"

    I will do whatever you tell me I should do as I would love to have this unit fixed, I lack in my electronics knowledge but with guidance I can and am willing to do it I will get back with better photos and part numbers here in a couple hours thank you