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Avo Mk3 Valve tester.

 
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Avo Mk3 Valve tester.

Post by malcscott » Sun Feb 01, 2015 4:16 pm

Hi, i am now the proud owner of a fully working Avo valve tester. I now need to read the manual for it and learn how to operate it. Does anyone have one of these who can offer any advice? Cheers, Malc.
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Re: Avo Mk3 Valve tester.

Post by Spot-Wobble » Sun Feb 01, 2015 5:38 pm

Malc,

What is the model number?

Andy

 
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Re: Avo Mk3 Valve tester.

Post by Cathovisor » Sun Feb 01, 2015 5:39 pm

Excellent - one of the best valve testers on the planet!

Andy, it's a Valve Characteristic Meter Mark III. No model number as such.

 
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Re: Avo Mk3 Valve tester.

Post by crustytv » Sun Feb 01, 2015 5:46 pm


 
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Re: Avo Mk3 Valve tester.

Post by freya » Sun Feb 01, 2015 7:30 pm

I wonder if the mod to help protect the fragile meter would be a good idea, unless its been done already. Dekatron on UKVRR seem to be an authority on all thing Avo valve tester. Lovely bit of kit though

 
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Re: Avo Mk3 Valve tester.

Post by Pamphonica » Sun Feb 01, 2015 8:15 pm

Well done Malc, that's a really great valve tester, one of the best ever made. But yes, they do have very fragile meters, most of which meet their maker not due to abuse but from damp. The dreaded "green spot" corrosion attacks the very fine wire in the 37uA meter movement and takes it open-circuit. So tuck it up nice and dry at all times - no leaving it in the shed under a sack!
You can do a bit of electrical protection of the meter by putting a couple of Si diodes (one each way) across the terminals. Crude but effective.
And do use a bit of switch lubricant on the various switches. They are probably getting a bit dry by now.
If the two clear plastic skirts start to craze and crack, just use an Avo knob from any Avo equipment of the same age (I can supply if needed) - the smaller knob, non-skirted is still perfectly usable.
Start by testing low-value valves! (and watch out for leaving that heater volts switch set for P-series valves!).

 
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Re: Avo Mk3 Valve tester.

Post by EDDINNING » Tue Feb 03, 2015 9:01 am

Hi Malcolm, contact me at the end of the month and you can come over and have a go with my MK3

Ed

 
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Re: Avo Mk3 Valve tester.

Post by malcscott » Tue Feb 03, 2015 10:45 am

Hi Ed, thanks for the offer, that is great. :)


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