UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Can the voltage at the PF terminals of an Avo Model 7 Mk2 be used as a diagnostic?

The Philpott · 2nd Dec 2017, 8:40 pm

I am very interested in people's opinions of this.

On occasions when i have had a avometer reading ACV too low, if it's an under-read to the tune of 60% it has been a switching problem (current going through DC parts of the meter that it should not be??) and if it's an under-read of the order of 10 to 25% it has been down to a lazy rectifier. Often when the rectifier is clapped out it can be seen to be quite corroded on the outside.

2nd Dec 2017, 8:40 pm	#2
The Philpott Dekatron Join Date: Aug 2016 Location: Colchester, Essex, UK. Posts: 4,105	Re: Can the voltage at the PF terminals of an Avo Model 7 Mk2 be used as a diagnostic I am very interested in people's opinions of this. On occasions when i have had a avometer reading ACV too low, if it's an under-read to the tune of 60% it has been a switching problem (current going through DC parts of the meter that it should not be??) and if it's an under-read of the order of 10 to 25% it has been down to a lazy rectifier. Often when the rectifier is clapped out it can be seen to be quite corroded on the outside. Last edited by The Philpott; 2nd Dec 2017 at 8:55 pm.