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AVO -- MK III
Valve characteristic meter

'The problem of designing a Valve Testing Instrument capable of giving a true and comprehensive picture of the state of any valve, has always been one of considerable magnitude, increasing in complexity as new valve types are brought into general use. For a quick general purpose test necessitating a minimum of time and technical effort a mutual conductance figure will give an adequate idea of a valve’s usefulness, and the original “ AVO ” Valve Tester was designed to test the ...

Sony -- CDX-GT500/
Car CD Tuner

Grundig -- SEDANCE 70 ST 70-284 DOLBY
TV

Sony -- EX2T
TV chassis

Grundig -- P 37-4201/5 TOP
TV

Philips -- SL400i
Receiver