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The filament circuit should not be affected for the caps. There are two series filament strings that connect directly to the AC line through a ballast resistor.
Sounds like there is a problem in the voltage double B++ supply that is shorting out the AC line.
Note that none of the negative leads of the electrolytics connect to the chassis. The chassis is floating in this set - it is not common. Also make sure your diodes are not installed backwards.
Also I'm wondering about the values of the caps you're using. There should be a 140, 120 and 100 uF cap in the B++ supply circuit - nothing in the 10-20 range.
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