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Old 11th Mar 2018, 5:53 pm   #6
WME_bill
Octode
 
Join Date: Oct 2007
Location: Exeter, Devon, UK.
Posts: 1,553
Default Re: Avo Universal Measuring Bridge Type 1

Avo Universal Bridge, Suitcase style.
Yes, that identifies it nicely. The lid is just a duplicate of the base, with clips that fit over the top. Nothing in it. Not like the Avo Valve Tester CT160, where the lid contains the valve bases.
Voltages you can almost guess from the usual operating conditions of the !2AU7. Quite close enough, apart from the main HT rail. I seem to remember around 200v. But changing the smoothing electrolytic capacitors will resolve that.
Good luck. I do hope the slider resistor is unharmed.
wme_bill
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