20-11-2012, 04:56 PM
Chop out the mains filter cap, C60 on the Bush Sheet, C66 on the trader sheet. Remove V7 (UY85), Don't plug the set in but turn it on at the switch. It should read nothing across the plug pins.
If it still reads 200 Ohms, then it's either the switch or the mains setting that's wired wrong or faulty.
Check for blobs of solder or short circuits too.
There should be no reading at all with V7 disconnected. Now put V7 back and remove the valves and check the resistance across the mains plug and then put the valve back before moving on to the next one. Do them in this order....
UL84
There are 2 UF80's - remove the one nearest the UABC80.
The other UF80.
UCH81.
UCC85.
UABC80.
If you find that one valve, when removed does not cause the reading to drop to 0, then check the capacitor before it on the chain and the valve before it.
If you get through this without any trouble, try giving it some mains.
I tend to just give it mains and see what goes bang, but that's just me.
Cheers,
Steve P.
If it still reads 200 Ohms, then it's either the switch or the mains setting that's wired wrong or faulty.
Check for blobs of solder or short circuits too.
There should be no reading at all with V7 disconnected. Now put V7 back and remove the valves and check the resistance across the mains plug and then put the valve back before moving on to the next one. Do them in this order....
UL84
There are 2 UF80's - remove the one nearest the UABC80.
The other UF80.
UCH81.
UCC85.
UABC80.
If you find that one valve, when removed does not cause the reading to drop to 0, then check the capacitor before it on the chain and the valve before it.
If you get through this without any trouble, try giving it some mains.
I tend to just give it mains and see what goes bang, but that's just me.
Cheers,
Steve P.
If we've always had that, why is the car boot open? You aren't smuggling in another old TV are you...?
