AVO VCM163 problem. - UK Vintage Radio Repair and Restoration Discussion Forum

HBWOODY · 14th Sep 2022, 4:26 pm

Was going through the Service manual "setting up procedure"after installing a replacement mA/V meter when reaching (k) in"setting up procedure" I only got a reading of 24V dc not the expected 52V dc. Was wondering if there is an obvious reason for this.

John_BS · 16th Sep 2022, 9:12 pm

The most obvious answer is that you're measuring at the wrong end of R21

John

HBWOODY · 18th Sep 2022, 5:38 pm

How right you are. Did eventually realise what I was doing wrong.
My problem at the moment is not being able to calibrate to the red CAL line(always too high) on the mA/V meter when going through the process of setting up and calibrating.

14th Sep 2022, 4:26 pm	#1
HBWOODY Pentode Join Date: Mar 2020 Location: Bodmin, Cornwall, UK. Posts: 212	AVO VCM163 problem. Was going through the Service manual "setting up procedure"after installing a replacement mA/V meter when reaching (k) in"setting up procedure" I only got a reading of 24V dc not the expected 52V dc. Was wondering if there is an obvious reason for this.

16th Sep 2022, 9:12 pm	#2
John_BS Octode Join Date: Dec 2008 Location: Wincanton, Somerset, UK. Posts: 1,780	Re: AVO VCM163 problem. The most obvious answer is that you're measuring at the wrong end of R21 John

18th Sep 2022, 5:38 pm	#3
HBWOODY Pentode Join Date: Mar 2020 Location: Bodmin, Cornwall, UK. Posts: 212	Re: AVO VCM163 problem. How right you are. Did eventually realise what I was doing wrong. My problem at the moment is not being able to calibrate to the red CAL line(always too high) on the mA/V meter when going through the process of setting up and calibrating.