UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - AVO CT160

Craig Sawyers · 25th Feb 2018, 4:59 pm

If the paralleled meter and shunt read 9k your meter is open circuit. There is basically a 10k resistor in parallel with the meter which has a resistance of 3.25k. So the parallel combination should be about 2.5k

It is highly unlikely that the D77's are duff, and that would not explain the resistance readings across the meter.

25th Feb 2018, 4:59 pm	#6
Craig Sawyers Dekatron Join Date: Nov 2010 Location: Oxford, UK. Posts: 4,991	Re: AVO CT160 - relay activates at power on If the paralleled meter and shunt read 9k your meter is open circuit. There is basically a 10k resistor in parallel with the meter which has a resistance of 3.25k. So the parallel combination should be about 2.5k It is highly unlikely that the D77's are duff, and that would not explain the resistance readings across the meter.