UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Station X · 3rd Dec 2017, 9:22 pm

I've been caught out by something similar. When testing some valves on an AVO CT160 the heaters showed as having CONTINUITY. However subsequent tests showed they had no emission. Problem was dirty valve pins. Subsequent study of the CT160's circuit show that even a very high resistance would show as continuity.

I think you've already cleaned the valve's pins, but ""nip up" the sockets on the valve holder too so that they grip the valve pins firmly.

3rd Dec 2017, 9:22 pm	#40
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Murphy A188C repair. I've been caught out by something similar. When testing some valves on an AVO CT160 the heaters showed as having CONTINUITY. However subsequent tests showed they had no emission. Problem was dirty valve pins. Subsequent study of the CT160's circuit show that even a very high resistance would show as continuity. I think you've already cleaned the valve's pins, but ""nip up" the sockets on the valve holder too so that they grip the valve pins firmly. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.