UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Eddystone S640. Mains primary open circuit.

G6Tanuki · 13th May 2021, 5:53 pm

The bucking-transformer is indeed a cunning way to deal with this - though I'd be fitting the radio with a 'non-standard' mains plug so it doesn't inadvertently get plugged-into a normal supply.

[I've done this with an Eddystone 840A which had an open-circuit in the bit of the dropper-resistor needed to run off 200/240V: it now works with an autotransformer, has a US-style 2-prong plug to reduce the risk of inadvertent misconnection, and an admonition on the rear of the case saying "FOR USE ON 110-120V AC/DC SUPPLIES ONLY!"]

13th May 2021, 5:53 pm	#8
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,005	Re: Eddystone S640. Mains primary open circuit. The bucking-transformer is indeed a cunning way to deal with this - though I'd be fitting the radio with a 'non-standard' mains plug so it doesn't inadvertently get plugged-into a normal supply. [I've done this with an Eddystone 840A which had an open-circuit in the bit of the dropper-resistor needed to run off 200/240V: it now works with an autotransformer, has a US-style 2-prong plug to reduce the risk of inadvertent misconnection, and an admonition on the rear of the case saying "FOR USE ON 110-120V AC/DC SUPPLIES ONLY!"]