Hi

So I managed to get time on the workbench today. I Meggered the Power transformer and so far indicated good readings for the Mains I/P to Chassis. All windings showed Good DC values.

I pulled L1 Off the Chassis and you can see the in-print of an old value of cap that was there before so not shore when the caps were changed.... Before or after the meltdown of L2/L3 (See Photos)

L2 fully collapsed when I bumped it with the meter probes.... L3 Indicated Good DC resistance.... Go figure!

Why would L1 be ok? The Voltage rating of C1 Must have been High enough to protect it.

Makes me think that somehow Mains was fed into the Antenna Input (The Oragne Wire) and that would have done the damage..... If it were Lightning as stated before then alot more would have happened. This got Hot not evaporated.

Else who knows.

Ether way that's all this set needs as far as the hard to get parts. If I get one then it will get a full overhaul as the Speaker transformer and IF are all testing good.

Have a good weekend all.

AWA 565MA Circuit Diagram

‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
Valve radios, They just don't make them like they used to

Photos and document uploaded to Post 16.

I also checked my chassis stock - unfortunately no spares for this model.

‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

Hi Flakes, I agree with your findings in post 16.


For the moment you dont really need L1 and L2.
To get the set going as long as L3 has the correct inductance the tuning will resonate, and the set will work.
An antenna could be fed into L3 through a small pf capacitor to get signal through.
I would cut the burnt windings off the former and re-install L3 alone.

The proper aerial coil could be the last fix not the first.
If no coil can be found, I would pinch some wire from a scrapped IFT and hand wind a coil on.
Get the rest done and see if L3 allows tuning.

Fred.

With the coil with the white wax it could be remelted, however, I consider that a failed coating method as it cracked and place it in the oven & melt the wax into absorbent paper. Then its sprayed with Mar.

If the antenna coil primary is the burnt & a non resonant coil, you could try winding an other coil over the top of the resonant one. Done that several times.

Beware of caps across coils. they are often critical.

Marc