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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

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Old 11th Jun 2021, 12:20 pm   #1
les24preludes
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Default AVO 2 Panel - restoration ideas?

I have an AVO 2 Panel tester which doesn't work. Don't know why - meter lost magnetism or what. Before I open up the meter part I'm wondering what's the simplest fix. One easy solution it seems would be to use the panel part and make a basic emissions tester from scratch to connect to it. If so, what's the 9 pin connector - a B9G? Diameter of pins is 26mm in a straight circle.

Any ideas for a basic emissions tester, circuit etc? I have bench supplies at 30v/2A or 15v/4A for the heaters and grid bias. I could rig up a basic HT and use a 150v glow tube for instance. I'd use a multimeter to read off results. I only intend to measure smaller input tubes and maybe some outputs like 6L6, 6V6 etc. Nothing exotic or bigger.

Or if I open up the Meter unit, can I substitute a couple of test points for the meter and use a multimeter instead?
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Old 11th Jun 2021, 12:49 pm   #2
ms660
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Default Re: AVO 2 Panel - restoration ideas?

Quote:
Originally Posted by les24preludes View Post
what's the 9 pin connector
B9 so far as I know.

Lawrence.

Last edited by ms660; 11th Jun 2021 at 1:05 pm. Reason: additional info
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Old 11th Jun 2021, 3:05 pm   #3
les24preludes
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Default Re: AVO 2 Panel - restoration ideas?

Thanks - I've ordered a B9 socket. Now I need to figure out an easy build for a way to test emissions.

ideas?
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Old 12th Jun 2021, 5:50 am   #4
Electronpusher0
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Default Re: AVO 2 Panel - restoration ideas?

The AVO 2 panel has the same horseshoe magnet as the AVO 7 and seems to suffer from loss of magnetism. I have tried re-magnetising the magnet and replacing it with a neobium magnet.
I reported my adventures here:

https://www.vintage-radio.net/forum/...d.php?t=165159

I have also breadboarded a digital meter replacement for the AVO 2 panel using peak detection and sample and hold, this works well on the bench on simulation, I am trying to find the main panel from a 2 panel AVO tester with a duff meter to fit it into.

see here:

https://www.vintage-radio.net/forum/...7&postcount=14

Peter
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