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Old 18th Dec 2019, 3:33 pm   #28
Cathode Ray
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Join Date: Dec 2018
Location: County Meath, Ireland
Posts: 232
Default Re: Philetta BD 244U

Folks,
While researching Dropper replacement ideas , I came across Paul Stenning's guide on resistor / capacitor dropper's.

https://vintage-radio.com/repair-res...per-calcs.html

The Philetta draws a fairly constant 300mA at 230v AC, even with the volume up loud, so it seems like a good candidate for a capacitor dropper

Paul's excel calculator sheet is an excellent tool and by my calculations it would need a 4.7uF to 5uF Run Capacitor to drop 113v and provide 117v to the radio.

The radio can then be configured for 110v running.

Anyone see any issue with this proposal?

I'm aware that the fail mode of capacitor can be short circuit so there is that risk.
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