RGD A112. Help please!

[Yorkie]

If the model is indeed a '1-2', as seems to be the case, the valves are:

V1 ECC85 (VHF Tuner)
V2 ECH81
V3 EF85
V4 EABC80
V5 EL84
V6 EZ80
V7 EM80 (Msgic Eye).

The location of the valves, looking on top of the chassis from the rear, are:

Vaves nearest to the rear apron of the chassis:

Valve next to the mains transformer/voltage selector is V6.
Valve between the two square IF transfomers is V3.
Valve to the far right next to the external loudspeaker socket/pick up is V5

The innermost valves are (left to right):

V2 - behind V6, near to the mains transformer.
V4 - just right of centre.

(You'll most likely find any of these commonplace valves on e-bay)

If you intend to put the radio into regular use I'd suggest that the least work you should do on it would be to replace C57 (0.05uF - use modern equivalent 0.047uF) which couples the anode of V4 to the grid of V5. This is known by the hackneyed term 'that capacitor' and they are often leaky in the electrical sense. Its role in life is to allow AF signals to pass from the anode of the IF stage to the grid of the AF amplifier while blocking DC voltage. If it fails to do that effectively it can cause excess current to be drawn, overdrive the audio valve, stress the output transformer and cause other undesireable problems. (C57 is located under the chassis on a tagstrip next to the output transformer). Most restorers change this capacitor on any valve radio as a matter of course. Personally, I also change the cathode bypass capacitor, which isn't so critical. It's C60 in your set - 25uF 12V. A modern equivalent would be 22uF 25V, (which will look comically small alongside the original, as do many modern components, such as resistors).

Obviously you need the service data (which runs to 6 pages) before you start poking around.

Sorry if I'm telling you stuff you already know.

Hope that helps a bit Chris.

Best of luck with the set - Long Wave, Medium Wave, Short Wave and VHF. What's not to like about that?