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Old 31st Jan 2006, 1:38 am   #3
Cerberos
Tetrode
 
Join Date: Apr 2005
Location: Holmfirth, West Yorkshire, UK.
Posts: 55
Default Re: Ultra Coronation Twin - What on earth is this?

Looking at the valves;

In place of the mazda IC2 is a mullard DK 96

In place of the Mazda IF3 is a brimar BVA, D7, DF 96

In place of the Mazda IFD9 is something with the markings completely worn away

In place of the Mazda IP11 is a mullard DL 96.

I assume all these valves ending in 96 mean thay are part of the same series? If that is so what should the heater current be?

Leaving the set in battery mode, I can measure about 1.3k between the LT battery terminals when the set is switched on. So that would seem to suggest the valve filaments are intact.

Inspecting the rest of the set, there are a couple of cracked hunts capacitors, some very badly tarnished switches, a dodgy looking wax capacitor across the mains ans looking at where the main dropper resistor has failed I would think the HT smoothing cap is leaky.

So I'm not frightened off yet, I hope with some advice and guidance I can get this going again, what do you think?
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