Graves Vulcan Battery Set

[Yorkie]

I was lucky enough to get one of these sets dating from around 1938, it is a set I won at the last Wooton Bassett auction but did not know about it until it was thrust at me yesterday at the Golborne meet.

It is very similar to the Aerial set I have already done, the details are here

http://golbornevintageradio.org/forum/showthread.php?tid=41&highlight=graves+aerial

Does anyone have the circuit for the Vulcan?

cheers Mark

Only got the 'Vulcan 2', which featured in December 1928 Wirless World. It uses two battery valves - PM1HF & PM2, requires two HTs, a Grid Bias and LT (the voltages of which aren't stated). The article says that the original Vulcan was reviewed in the July 1927 Wireless World, so it sounds like it's not at all the same set as yours, which you believe was made a decade later, even though it has the same name 'Vulcan'.

It's a very simple TRF design, in which the reaction is varied by swining the 'wave-wound' coil through 180 degrees in relation to the coil for each waveband.

I'm not sure that any of this is much use to you Mark as it probably has no relation to your own newly acquired set.