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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 2019, 8:17 pm   #1
Valveoid
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Join Date: Apr 2019
Location: Barton-le-Clay, Bedfordshire, UK.
Posts: 2
Default Avo Mk1 Valve tester

Hi there - just found this website and being an analogue man who loves reel to reel tape recorders and valve amps I thought I'd join up.

I recently picked up an ancient Avo Mk1 Two panel valve tester in good condition, got the user manual and valve data and set it up to test an EL34 valve from my Selmer Treble and Bass amp. However on turning on instead of the needle moving slightly to the right and then having to re-set it to zero using the set zero control it shoots violently over to the right and I can't reset it to zero - anyone got any ideas? Thanks in advance...
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Old 12th Jun 2019, 5:24 pm   #2
Simon Gittins
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Join Date: Jan 2006
Location: Cornwall, UK.
Posts: 117
Default Re: Avo Mk1 Valve tester

Hi and welcome.

Unfortunately, it could be the set zero control itself; needless to say this is a special and I'm not sure if there is an easy fix. Worth checking the rectifier in the same circuit.

Putting "AVO 2 Panel" into the search box at the top will bring loads of posts.

Hopefully an expert will give further advice.
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Old 12th Jun 2019, 8:49 pm   #3
Simon Gittins
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Join Date: Jan 2006
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Default Re: Avo Mk1 Valve tester

Some relevant information from Post 8 onwards in this thread:
https://vintage-radio.net/forum/showthread.php?t=70458
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