I acquired this wireless recently in a state of complete shambles. The chassis was severely rusted, the speaker and transformer were missing and all that remained of the cabinet was the front - fortunately- and the base. All coils and the power transformer had continuous windings. The cabinet is progressing very slowly but progressing none-the-less. The main issue with it, which will test my woodworking skill, is two pieces of solid timber, one either side of the curved top, with negative curves. I have borrowed a moulding plane with a curved blade so there is some fun to be had with that.
I found a circuit on Radio Museum so started on a complete strip and detailing of the chassis. It became obvious very quickly that the circuit in my set differed significantly from the one I had found. I have since borrowed another, supposedly identical set, from one of our members. Interestingly, his set conforms exactly to the Radio Museum circuit. There is however no doubt that the circuitry in my set is original. One of the main differences is that the output PP 2A5s in my set are connected as pentodes while in the other set they are connected as triodes.
Some time later the newly plated chassis is back and just today, I switched it on. Only one wiring error and it is all operating nicely.
Mmmmm. The two chassis are laid out identically, but have different circuits. The, what I would call "more conventional" circuit in my set has an earlier serial number than the other set. Patterson must have changed the circuitry for a good reason but my set goes well.
Hi Steve, A very interesting article. It describes exactly the various issues I came across during the reconstruction. I had a laugh when I read about the rubber mounts for the tuning condenser being so perished that the dial rests on the tuning shaft. I had to disassemble this to repack these grommets. The dial drive mechanism is identical too. Cheers