Civilian Receiver. AC Mains Model. Cossor - UK Vintage Radio Repair and Restoration Discussion Forum

bizmark98 · 20th Aug 2007, 8:25 pm

Got this very recently and after the usual checks applied power.

Result: Nothing not even a crackle.

Whipped the back off and noticed that valves V2 and V3 heaters were not glowing.

So out come the valves for a quick filament check. All ok so valves back in and another application of power. Dead.

So out comes the chassis for continuity checks on the heater circuit. All ok. So applied power and tested for 6.3 v Ac. Yes all present and correct.

So turn the chassis over,apply power...nothing.

Scratch head with great vigour...Notice that the return for the heaters is via solder tags using the IF can nuts as the anchor point. Note also the nuts are marked with yellow paint which is undisturbed.

4Ba nut spinner discovers that there is a good turn left on the nuts on both IF's.

Apply power and all is well.

The chassis was well oxidised and I wonder if this fault was evident when the set was in use.

Interesting fault though!. Made even more interesting by the rectifier valve being on top of the mains transformer which made turning the chassis over awkward.

Maurice

John1 · 20th Aug 2007, 9:46 pm

Any chance of a pic or two ?

bizmark98 · 21st Aug 2007, 7:22 am

Hi John

Not a problem its having the case done at the moment so will take some pics of the chassis tonight.

Maurice

bizmark98 · 21st Aug 2007, 7:36 pm

Four Pictures of the Chassis.

Civ1 shows the rectifier mounted on top of the mains transformer
Civ2 general view of the chassis underside
Civ 3 and 4 show the anchor points for the heater returns with the yellow locking paint

Maurice

Phil G4SPZ · 21st Aug 2007, 9:03 pm

These sets give a pretty good account of themselves. When I got mine, a GEC model, a previous owner had replaced the three reservoir/smoothing capacitors but wired one of them wrongly, returning it to chassis. Two were o/c anyway, and replacing them and wiring them up correctly got the set working again straight away.

Phil

bizmark98 · 22nd Aug 2007, 12:52 pm

Hi Phil

The only thing that has been done to this set is rewiring to the two valve top caps plus two of the valves are not BVA numbers.

None of the capacitors appear to have been changed but some look a bit yukky.

Intend to give it a good soak test over the weekend and see if anything amiss happens.

But it does give a good account for itself volume wise and is quite sensitive.

The cabinet needs a bit of work as someone has carved initials into the top (VIA).

Maurice

20th Aug 2007, 8:25 pm	#1
bizmark98 Retired Dormant Member Join Date: Dec 2002 Location: Wigmore, Kent, UK. Posts: 102	Civilian Receiver. AC Mains Model. Cossor Got this very recently and after the usual checks applied power. Result: Nothing not even a crackle. Whipped the back off and noticed that valves V2 and V3 heaters were not glowing. So out come the valves for a quick filament check. All ok so valves back in and another application of power. Dead. So out comes the chassis for continuity checks on the heater circuit. All ok. So applied power and tested for 6.3 v Ac. Yes all present and correct. So turn the chassis over,apply power...nothing. Scratch head with great vigour...Notice that the return for the heaters is via solder tags using the IF can nuts as the anchor point. Note also the nuts are marked with yellow paint which is undisturbed. 4Ba nut spinner discovers that there is a good turn left on the nuts on both IF's. Apply power and all is well. The chassis was well oxidised and I wonder if this fault was evident when the set was in use. Interesting fault though!. Made even more interesting by the rectifier valve being on top of the mains transformer which made turning the chassis over awkward. Maurice

20th Aug 2007, 9:46 pm	#2
John1 Retired Dormant Member Join Date: Apr 2006 Location: Hertfordshire, UK. Posts: 24	Re: Civilian Receiver. AC Mains Model. Cossor Any chance of a pic or two ?

21st Aug 2007, 7:22 am	#3
bizmark98 Retired Dormant Member Join Date: Dec 2002 Location: Wigmore, Kent, UK. Posts: 102	Re: Civilian Receiver. AC Mains Model. Cossor Hi John Not a problem its having the case done at the moment so will take some pics of the chassis tonight. Maurice

21st Aug 2007, 7:36 pm	#4
bizmark98 Retired Dormant Member Join Date: Dec 2002 Location: Wigmore, Kent, UK. Posts: 102	Re: Civilian Receiver. AC Mains Model. Cossor. Pictures Four Pictures of the Chassis. Civ1 shows the rectifier mounted on top of the mains transformer Civ2 general view of the chassis underside Civ 3 and 4 show the anchor points for the heater returns with the yellow locking paint Maurice Attached Thumbnails

21st Aug 2007, 9:03 pm	#5
Phil G4SPZ Dekatron Join Date: Apr 2005 Location: Bewdley, Worcestershire, UK. Posts: 4,748	Re: Civilian Receiver. AC Mains Model. Cossor These sets give a pretty good account of themselves. When I got mine, a GEC model, a previous owner had replaced the three reservoir/smoothing capacitors but wired one of them wrongly, returning it to chassis. Two were o/c anyway, and replacing them and wiring them up correctly got the set working again straight away. Phil __________________ Phil Optimist [n]: One who is not in possession of the full facts

22nd Aug 2007, 12:52 pm	#6
bizmark98 Retired Dormant Member Join Date: Dec 2002 Location: Wigmore, Kent, UK. Posts: 102	Re: Civilian Receiver. AC Mains Model. Cossor Hi Phil The only thing that has been done to this set is rewiring to the two valve top caps plus two of the valves are not BVA numbers. None of the capacitors appear to have been changed but some look a bit yukky. Intend to give it a good soak test over the weekend and see if anything amiss happens. But it does give a good account for itself volume wise and is quite sensitive. The cabinet needs a bit of work as someone has carved initials into the top (VIA). Maurice