This radio has been lurking in my garage for a couple of years now, it is a fairly substantial 7 valve, very early superhet radio from 1932, and it came complete with 2 plug in SW coils.
Valvebloke very kindly dragged it across London on public transport and foot, and delivered it to Pppenguins get-together for me back in, I think, 2013.
Now I have it on the work bench it is obvious that somebody has had a go at it and abandoned their efforts half way through, probably because they found the speaker energising coil was open circuit. (oh no not another one
) Well I am pretty certain the duff Rola speaker which came with the radio would not have been fitted by KB anyway.
Tests made so far;
Speaker energising coil is open circuit.
The mains transformer seems to test OK, 2x 4 volt windings and is giving a very healthy 380 volts on each half the HT winding.
The choke also has a continuous winding.\
The OP transformer windings test as continuous.
The inter-valve AF transformer windings also test continuous.
The 4v dial lamp filament is OK.
And all 7 valve heaters are continuous.
The capacitor block, I assume to be electrolytic, is a 4 x 4 x 3 inch lump, it has had some wires cropped and various other capacitors have been half heartedly fitted around it. It is marked as 12.1MF Working 250 VDC and has I believe 2x 4uF 2x 2uF and a 0.1uF.
I am going to have to cut the bottom off this block to replace the contents. But something which puzzles me is, it is marked as only 250vDC, and I would have thought this was rather low considering the HT windings are giving 380 volts.
There is also another 8uF capacitor with a screw thread base (missing, been replaced with a smaller one from the 50's) which fits onto the shelf for mounting the speaker, which I would like to source a replacement for, so I can re-stuff it. I an pretty certain that the missing capacitor should look like one of these.
The Bakelite on/off switch mounted on the side of the radio has had a whack at sometime in the past and has half the front missing.
There is a ganged potentiometer listed as 500k and 15k it seems to be working of a sort but is measuring 1M and somewhere between 100k and 25k, so it looks like the rivets will need to be drilled out and the insides given a service.
The underside of the chassis looks a lot more original and untouched.
I will put a post in the wanted section for the screw base 8uF cap and Bakelite on/off switch.