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The Philpott · 9th Dec 2018, 3:13 pm

Peter's Model 1 Type HRM is the same spec. as mine, and indicates average production of 54 units/month between July 1948 and January 1950. Many miniature bobbins inside- none of mine had gone o/c which was a little surprising.
Lubricating the ball/spring detents on the rotary switches caused problems with liberated grit on mine, and i ended up removing the selectors, cleaning up and re-lubricating.
Battery compartment mod. image follows.

Dave

9th Dec 2018, 3:13 pm	#1852
The Philpott Dekatron Join Date: Aug 2016 Location: Colchester, Essex, UK. Posts: 4,108	Re: AVO Multimeter survey Peter's Model 1 Type HRM is the same spec. as mine, and indicates average production of 54 units/month between July 1948 and January 1950. Many miniature bobbins inside- none of mine had gone o/c which was a little surprising. Lubricating the ball/spring detents on the rotary switches caused problems with liberated grit on mine, and i ended up removing the selectors, cleaning up and re-lubricating. Battery compartment mod. image follows. Dave