resistance problem & 6080 tube won't glow

popretty · 1280

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Offline popretty

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on: May 17, 2016, 09:57:10 PM
Hi all,

I assembled all the parts and have been enjoying this amp a lot.
Recently, the fuse was blown and I figured out what happened. The leg of the resister embedded in terminal 15 touched the terminal 1 on the transformer.
So I sealed that leg with electric tape and put in a new fuse and rechecked the resistance.

However, now I got two problems. First, my 6080 tube won't glow. (12AU7 tube is glowing) Second, the resistance between terminal 12 and 13 stays at 2.9 K Ohms instead of climbing slowly toward 270 K Ohm, even though the manual says it will do if the amp is assembled correctly.

Because my amp had functioned well before that accident, I think it's not a soldering problem.
Instead, I guess this problem stems from a blown capacitor, but I am not sure.

In that capacitors are quite expensive I want to get any advice before ordering new capacitors.
I will appreciate for any suggestion.

Thanks,
« Last Edit: May 17, 2016, 10:06:20 PM by popretty »



Offline Paul Birkeland

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Reply #1 on: May 19, 2016, 07:09:58 AM
I would wonder if the base guide pin of your 6080 broke off, and it's now not inserted correctly into the socket.  Otherwise, check the solder joints on B7 and B8. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man