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20th Aug 2007, 8:25 pm | #1 |
Retired Dormant Member
Join Date: Dec 2002
Location: Wigmore, Kent, UK.
Posts: 102
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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 |
Retired Dormant Member
Join Date: Apr 2006
Location: Hertfordshire, UK.
Posts: 24
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Re: Civilian Receiver. AC Mains Model. Cossor
Any chance of a pic or two ?
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21st Aug 2007, 7:22 am | #3 |
Retired Dormant Member
Join Date: Dec 2002
Location: Wigmore, Kent, UK.
Posts: 102
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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 |
Retired Dormant Member
Join Date: Dec 2002
Location: Wigmore, Kent, UK.
Posts: 102
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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 |
21st Aug 2007, 9:03 pm | #5 |
Dekatron
Join Date: Apr 2005
Location: Bewdley, Worcestershire, UK.
Posts: 4,748
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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
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Phil Optimist [n]: One who is not in possession of the full facts |
22nd Aug 2007, 12:52 pm | #6 |
Retired Dormant Member
Join Date: Dec 2002
Location: Wigmore, Kent, UK.
Posts: 102
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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 |