Tubes Asylum

RE: Thoughts....

45.36.50.144

boodles

In Reply to: RE: Thoughts.... posted by andy evans on October 25, 2023 at 10:35:25

Hi Andy,
Thanks for your help. The 01A tube has 4 pins - 2 are thick and plug into the front socket holes, and 2 are thin and plug into the rear holes of the socket. Do you happen to know which ones go to the heaters?
Thanks again,
Chris

Follow Ups:

The two thick pins are the heater. . - John PA 15:11:15 10/25/23 (6)
you can measure across them.

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- RE: The two thick pins are the heater. . - boodles 15:32:28 10/25/23 (5)
  Thanks, John,
  So, if I measure across the two thick pins, I get a reading of "over limit", even if I set the scale on my multimeter to 2 MOhm, so I am assuming this means the heater circuit is intact?
  best,
  Chris
  - RE: The two thick pins are the heater. . - Jim McShane 17:37:35 10/25/23 (2)
    Either you have poor contact between the probes of your DMM and the tube pins or you (unfortunately!) have open heater circuits in the tubes themselves.
    
    If you put both probes on the SAME tube pin you should get readings of zero or very near zero resistance. If you are still getting high resistance readings like you have now, it means your probes - one or both - aren't making good contact with the tube pins. Try this on both of the fat pins so you know you can make good contact on both of them.
    
    Please post your results.
    - RE: The two thick pins are the heater. . - boodles 05:07:31 10/26/23 (1)
      Hi Jim,
      Putting both probes on the same pin gives me readings of essentially zero, so I guess that means the heater circuit in the tube is bad :-(
      Thanks so much for your help confirming this,
      Chris
      - RE: The two thick pins are the heater. . - Jim McShane 17:11:04 10/26/23 (0)
        
        In Reply to: RE: The two thick pins are the heater. . posted by boodles on October 26, 2023 at 05:07:31
        
        Yes, it seems the tubes themselves are at fault, sorry to say.
        
        I'm glad I could help - but I sure wish you would have had a better outcome!
  - RE: The two thick pins are the heater. . - boodles 16:01:00 10/25/23 (1)
    Or does this mean it is broken and I should try Andy's idea of reflowing solder?
    - Just get another 01A ~nt~ - Byrd69 18:08:00 10/25/23 (0)
      .
      
      Your interest may vary but the results will be same. (Byrd 2020)
      
      I can't compete with the dead. (Buck W. 2010)
      
      Cowards can't be heroes. (Byrd 2017)
      
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