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Old 31st Jan 2006, 1:48 am   #4
paulsherwin
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Join Date: Jun 2003
Location: Oxford, UK
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Default Re: Ultra Coronation Twin - What on earth is this?

It's certainly restorable. Your set has been fitted with the Dx96 series of valves which take half as much heater current as the originals (25mA in a series string, compared with 50mA.) This would have made battery operation more economical, but the filamant ballast value will need to be changed to take account of this. This is probably why the wirewound pot was fitted.

The mains wax cap you mention should be replaced with a modern X2 rated component. The Hunts mouldseals should be replaced with modern film capacitors.

The HT smoothing caps may actually be OK, you never know. It may be best to change them anyway though, since you'll be doing a lot of recapping anyway.

Good luck, Paul
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