Cossor Model 527/X - UK Vintage Radio Repair and Restoration Discussion Forum

Andrew Humphriss · 24th Dec 2021, 2:19 pm

Year 1955 biscuit tin box radio made as a Community radio for African villages.
Does any reader have a circuit diagram Trader sheet?
Thank you
Andy 2E0NDZ

Cobaltblue · 24th Dec 2021, 3:14 pm

Trader never did a sheet for this set.

Cossor did one but I don't have a copy I got beaten to it a couple of years ago.

It follows normal battery valve practice.

Cheers

Mike T

Andrew Humphriss · 25th Dec 2021, 10:58 am

Thanks Mike
Happy Xmas
73s
Andy

Richardgr · 30th Dec 2021, 8:05 pm

That led to some very interesting googling!

Could it be similar to the Ever Ready Saucepan Special? Bit of information about valve lineup at Radiomuseum.

Cobaltblue · 30th Dec 2021, 8:38 pm

The Saucepan special predates the Cossor set by 5/6 years by which time the 96 (25mA filaments as opposed to the 50mA filaments of the earlier set) series of 7BG battery valves had been released.

Virtually all ( I am sure there are exceptions ) B7G 4 valve battery superhets used the same valves (often using a different number but equivalent to):

DK9* DF9* DAF9* and DL9* the last digit changing as the valves improved the final versions for the vast majority were the 96 series.

The DL96 having a centre taped filament for 25mA series operation or 50mA parallel (1.5V) operation. (some of the earlier versions of the DL9* also had centre taped filaments for 50/100 mA operation indeed in some sets one half of the filament is switched off in economy mode.

Cossor tended to use an American style numbering until the mid 1950's for their B7G battery valves (and other post war valves) as opposed to pro electron this carried on even after Cossor valves were produced by Philips/Mullard.

Some valves having both type numbers on them.

Cheers

Mike T

24th Dec 2021, 2:19 pm	#1
Andrew Humphriss Pentode Join Date: Jan 2009 Location: Stratford upon Avon, Warwickshire, UK. Posts: 127	Cossor Model 527/X Year 1955 biscuit tin box radio made as a Community radio for African villages. Does any reader have a circuit diagram Trader sheet? Thank you Andy 2E0NDZ

24th Dec 2021, 3:14 pm	#2
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,874	Re: Cossor Model 527/X Trader never did a sheet for this set. Cossor did one but I don't have a copy I got beaten to it a couple of years ago. It follows normal battery valve practice. Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

25th Dec 2021, 10:58 am	#3
Andrew Humphriss Pentode Join Date: Jan 2009 Location: Stratford upon Avon, Warwickshire, UK. Posts: 127	Re: Cossor Model 527/X Thanks Mike Happy Xmas 73s Andy

30th Dec 2021, 8:05 pm	#4
Richardgr Heptode Join Date: Oct 2019 Location: Täby, Sweden Posts: 706	Re: Cossor Model 527/X That led to some very interesting googling! Could it be similar to the Ever Ready Saucepan Special? Bit of information about valve lineup at Radiomuseum.

30th Dec 2021, 8:38 pm	#5
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,874	Re: Cossor Model 527/X The Saucepan special predates the Cossor set by 5/6 years by which time the 96 (25mA filaments as opposed to the 50mA filaments of the earlier set) series of 7BG battery valves had been released. Virtually all ( I am sure there are exceptions ) B7G 4 valve battery superhets used the same valves (often using a different number but equivalent to): DK9* DF9* DAF9* and DL9* the last digit changing as the valves improved the final versions for the vast majority were the 96 series. The DL96 having a centre taped filament for 25mA series operation or 50mA parallel (1.5V) operation. (some of the earlier versions of the DL9* also had centre taped filaments for 50/100 mA operation indeed in some sets one half of the filament is switched off in economy mode. Cossor tended to use an American style numbering until the mid 1950's for their B7G battery valves (and other post war valves) as opposed to pro electron this carried on even after Cossor valves were produced by Philips/Mullard. Some valves having both type numbers on them. Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk