My latest addition - Radialva Groom

[Geaney]

Thanks Robert, David,

I appreciate all the help with figuring this out. Sets this old seem to have a whole different set of challenges compared to later designs. In my case I have the following two main challenges:
- the valve set is not as per the circuit diagram. Two valves have alternatives fitted, one looks like a reasonable swap but the other looks to be quite a different valve than the one specified. I now have a complete 'correct' set and indeed the metal case 25L6 arrived to day. Assuming all the NOS metal valves test OK I've got a usable set to move forward.

- the dial bulbs appear not to be original and have been replaced with more commonplace 6.3v types rated at higher current - 250mA instead of 100mA.

I've decided to drive it from the variac at either 110v or 120v depending on how things turn out. I will use the 2 x 270R 20Watt resistors to drop from that to the heater chain. Another challenge here is finding space to site these two resistors. I believe I've come up with at least a trial solution so I'll give that a shot.

I hope to get some time on this one today so I will post an update with some photos later.

Thanks again for all the technical and moral support

Cheers, John