Hi Fixit, re the speaker, if the voice coil and rear suspension are intact you may be able to graft on a section of a modern cone to fill the space.
Would need some engineering and luck to get the same pitch angle and graft in, but doable.
Otherwise a professional repair item.
The whole set needs a lot engineering, but just go step by step.

Cheers, Fred.

It looks like a straight TRF set.
Have a go at drawing up the circuit -it is quite easy. Pin outs on the valve bases were pretty standard - but be aware the E445's top cap is the Anode connection.

You can use example circuits from contemporary radios to guide you.

Hi Fred
The spider is broken, but I think it is repairable. It is the Rola spiral shape type and the speaker is a K8 (I said 8K in my last post). No doubt a cone from something similar in size will be encouraged to fit, I enjoy inventing and adapting. I eventually found a picture of the example, but this radio remains a mystery as to actual vintage.

I have found a list of Targan Airmaster models 3 of which have 6 valves, a D36, B356 and AD35, but alas no circuits. I did find an old magazine on line which had a sample circuit displayed in answer to a query from a reader and it uses the valve types in my chassis, but only a 3 valve version, but of some help.

Still enjoying the research and the learning process on this and always measure twice before cutting. I will detail the steps maybe not video at this stage, but photos at least.

Thanks for your interest
Al

Hi All,

Thanks Nhanwell for the tip on the Anode. I am familiar with the top cap being a High Voltage Anode on PA Amps and although I haven't researched the 445 as yet, I had an idea it might have been a Screen Grid for some reason. I will definitely be sketching out the circuit soon as step 1 and filling in the blanks as I go. I will no doubt discover if it is a TRF along the way, all a learning curve on recognising the circuit.

There was an external box in the cabinet that had the antenna wire passing through it. So I looked inside to fine 2 coils in series with a Bakelite adjustable trimmer across each of the coils (a capacitor I imagine) so a form of pass band filter perhaps. I will measure it and do a sort of sweep of it to see.

I just finished a new circuit for my Paton Valve Tester while comparing the 2 existing circuits I found with the actual device. This allowed me to see if they all agreed with each other and let me find some faults on the unit itself. So on to the Airmaster chassis circuit now.

Thanks for your interest
Al

It is a TRF. Knowing that should make the tracing easier.

Hi Ian

That is quite correct, a TRF, I should have known from the simplicity of the circuit. I am working my way through the wiring and guessing the gaps in the chewed wires, mostly a bit of logic there. Quite a few components have failed so no idea which one may have led to the initial demise, which led to the loss of the remainder over time and rodent activity.

Thank you
Al