Philco 84 polarized plug conversion - Printable Version

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Philco 84 polarized plug conversion - Ctkid - 12-11-2024

Hello,

I am back working on my Philco 84 restore and have a question about the power connection. I am going to add a polarized plug and wanted to know if I should run the hot side to the volume/ power switch as it currently connected or to the Bakelite condenser (transformer coil) where I am going to replace the existing capacitors with .001 uf X1-Y2 safety caps.

Bob

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RE: Philco 84 polarized plug conversion - morzh - 12-11-2024

Yes, it is always better to have hot on the switch. The cap placed on the opposite side is also good as due to the inductance of the primary (the tubes not conducting) on the turn-on, it will not pull spark when the switch is closed or open.
The sch calls for 0.015uF, so the popular value being 0.01uF, this is what I use for Y-caps.
You could also experiment with adding X-cap across the line (I always do it with a parallelled 1M reisstor). In case you have interference to suppress.

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