I put a new fuse in (250mA), and powered it on last night.
The set came back on, and was passing the radio signal from the RX wire antenna to the Radio.
It didn't sound as if it was doing any amplifying or pre amping.
I opened the set, and had close look on all the parts with a LED torch.
There I noticed a small resistor burnt like barbecued sausage.
And one of the mica capacitor has been charred on the top.
So, 2x damaged parts are spotted
The set was not blowing the fuse anymore, and powering on and switching on and off and attenuation seems work,
but with those 2x damaged parts it couldn't be working properly.
Needing more work on this set.