loud hum

Mucker · **Reply #15 on:** March 07, 2022, 10:03:16 AM

Thompson 6080 .... worst vacuum tubes I ever owned .... not worth the headache .....

Paul Birkeland · **Reply #16 on:** March 07, 2022, 10:17:33 AM

Those voltages are still really wrong, are you measuring AC or DC volts with your meter? Are you able to measure a 9V battery?

bucketofguts · **Reply #17 on:** March 07, 2022, 10:26:17 AM

DC and I will look for a nine volt battery.

bucketofguts · **Reply #18 on:** March 07, 2022, 10:31:47 AM

I can measure a surfire 3 volt cr123 3 volt battery new at 3,4 volts....

Paul Birkeland · **Reply #19 on:** March 07, 2022, 11:14:38 AM

With no tubes in your Crack, what voltage do you get at B+ on the big PC board?

bucketofguts · **Reply #20 on:** March 07, 2022, 12:01:48 PM

bucketofguts · **Reply #21 on:** March 07, 2022, 12:06:30 PM

I have been working this issue all day. Thank you for the help!

Paul Birkeland · **Reply #22 on:** March 07, 2022, 12:50:18 PM

Please post build photos.

bucketofguts · **Reply #23 on:** March 07, 2022, 12:55:15 PM

Will get some up tomorrow. Thanks for all the help today.

b~

bucketofguts · **Reply #24 on:** March 08, 2022, 02:21:05 PM

Here are the requested photos.

Paul Birkeland · **Reply #25 on:** March 08, 2022, 02:59:58 PM

What are the voltages at 13 and 15?

bucketofguts · **Reply #26 on:** March 08, 2022, 03:21:50 PM

#13 63.5V
#15 80V

Power on.
(Valves in)

Paul Birkeland · **Reply #27 on:** March 08, 2022, 03:33:19 PM

Are you using terminal 12 as your ground reference?

bucketofguts · **Reply #28 on:** March 08, 2022, 03:33:52 PM

bucketofguts · **Reply #29 on:** March 08, 2022, 03:35:20 PM

BTW, thank you for your kind replies.