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 Post subject: Stumped - RESOLVED
PostPosted: Sat Feb 06, 2021 3:50 pm 
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Joined: Mon Jun 12, 2017 2:11 pm
Posts: 7
[quote][/quote]I bought two TC15 kits. First one went together really nicely. Corrected one ground fault and the amp was up and running and sounding insanely good.

With the second one, when I powered up with only the rectifier, all good voltage measurements. When I powered up with all tubes and a (known good) speaker and speaker cable, I got a loud pop and a loud hum.

I disconnected the OT leads and checked them all (per coco's specs). All good.

I checked, double checked and triple checked all components. I compared everything to my functional TC15. I just can't seem to find anything wrong.

Any suggestions?


Last edited by 56panhead on Sat Feb 06, 2021 4:56 pm, edited 1 time in total.

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 Post subject: Re: Stumped
PostPosted: Sat Feb 06, 2021 4:19 pm 
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Joined: Mon Jun 12, 2017 2:11 pm
Posts: 7
Power tube! Swapped with a known good EL84 and sure enough, problem went away.

Easy solution to what was looking to be a really hard problem.


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