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Old 20th Aug 2014, 10:51 am   #4
sparkymike
Heptode
 
Join Date: Dec 2006
Location: Colchester, Essex, UK.
Posts: 717
Default Re: PO 12D AVO 81/1 Meter Multirange

Thanks for that info Cliff. Did you work for Telecom?
I had found the instructions for type 71, but the circuit does not resemble mine. I was surprised how many diodes there are in it, over 12 at last count !! When PO is mentioned, youngsters will not realise that BT was all part of the post office in the 50's/60's and before I guess.
Well I got it working, but now it is not working !! It seems to have an intermittant fault somewhere but at the moment I can not locate it. I did look closely at the movement but could not see any stray bits of metal anywhere, but that could still be the case. The tracks on the switch were discoloured and I have cleaned them up somewhat, but still no joy..
Mike.
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