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Station X · 2nd Feb 2012, 10:00 pm

The amended readings for the UF41s show that the heater chain is OK.

The reading on pin 3 of the UCH42 is much better, but I wonder if there is a problem here with the voltage coming and going? Measuring the blue grey red? resistor (6.8K) would be a good idea so that it can be eliminated from out enquiries. Measure the resistance with the set turned off and the voltage on each end with the set turned on.

Don't worry about which waveband the set is set to. Just take readings on the UCH42 in all three?? positions of the wavechange switch.

I wonder whether you have a dodgy wiper on the tuning capacitor. try applying some switch cleaner to the wiper. Also check that there's no axial or radial play in its bearings.

2nd Feb 2012, 10:00 pm	#174
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Bush AC34, no sound. The amended readings for the UF41s show that the heater chain is OK. The reading on pin 3 of the UCH42 is much better, but I wonder if there is a problem here with the voltage coming and going? Measuring the blue grey red? resistor (6.8K) would be a good idea so that it can be eliminated from out enquiries. Measure the resistance with the set turned off and the voltage on each end with the set turned on. Don't worry about which waveband the set is set to. Just take readings on the UCH42 in all three?? positions of the wavechange switch. I wonder whether you have a dodgy wiper on the tuning capacitor. try applying some switch cleaner to the wiper. Also check that there's no axial or radial play in its bearings. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.