ALLSCOTT III 3Valve TRF - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

PJL · 12th Dec 2019, 3:47 pm

Most crystal sets had an option for loading coils to extend their frequency range. Marconi 1920's sets offered coil-sets right down to 3200 meters (93kHz)

David Simpson · 12th Dec 2019, 5:05 pm

John, you're lucky that the GB Battery didn't deposit acidic crud inside your cabinet. 'Twould be great if you can rescue the cardboard cover & scan it. Then re-pack with AA or AAA rechargeable cells. Some folk baulk at making up a battery of 6 or so cells, due to the soldering required. But I've found with careful cleaning, rubbing with 600 gauge emery paper, pre-tinning with 60/40 fc solder, that reliable GB(or even HT) packs can be made to fit inside old saved Every Ready, Exide, etc., cardboard covers. Judicious use of superglue or araldite, and pvc tape binding, can keep the cells & leads in place, and avoid movement.

Regards, David

12th Dec 2019, 3:47 pm	#21
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: ALLSCOTT III 3Valve TRF Most crystal sets had an option for loading coils to extend their frequency range. Marconi 1920's sets offered coil-sets right down to 3200 meters (93kHz)

12th Dec 2019, 5:05 pm	#22
David Simpson Nonode Join Date: Mar 2008 Location: Aberdeen, UK. Posts: 2,853	Re: ALLSCOTT III 3Valve TRF John, you're lucky that the GB Battery didn't deposit acidic crud inside your cabinet. 'Twould be great if you can rescue the cardboard cover & scan it. Then re-pack with AA or AAA rechargeable cells. Some folk baulk at making up a battery of 6 or so cells, due to the soldering required. But I've found with careful cleaning, rubbing with 600 gauge emery paper, pre-tinning with 60/40 fc solder, that reliable GB(or even HT) packs can be made to fit inside old saved Every Ready, Exide, etc., cardboard covers. Judicious use of superglue or araldite, and pvc tape binding, can keep the cells & leads in place, and avoid movement. Regards, David