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40-180 Restoration First Steps Question
#24

Status Update -

I replaced the electrolytics. Replaced a couple of other caps that looked pretty bad on the 41 tubes.
Powered up with variac (without tubes) to check for any issues, shorts, etc. All seemed good (even had the tuner dial lamp working, so there's that).

Put in the 84 rectifier tube - slowly increased variac.
But, hardly any output from the rectifier (essentially nothing versus the 270 V needed).
Checked the plates center tap voltages - all that was good. The DC to the lamp is good. Ground looks good.

I disconnected the electrolytic coming off the recitifier output just to make sure that wasn't doing anything strange and measure rectifier output again - like millivolt range output (basically nothing), even with the filament illuminating.

So, my conclusion (I think) is the 84 Tube is the issue.

Anything else I should be testing? (New tube on the way).

Thanks.


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RE: 40-180 Restoration First Steps Question - by tfonzart - 04-21-2026, 09:48 PM



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