Re: OT - VTVM’s are awesome


Hi: The Heathkit, Eico, Paco and Knight (Allied) VTVMs all had bannana jacks and probe cables of rubber, that cracked over the years. I recall one meter with the old microphone screw coax perhaps for AC input shield.

The VT bridge circuit seems to limit meter movement (200 uA?) overload, I never had damage to the movements even with extreme overload.

IM-28 were the newer series but basically same as the VT-7.

Hope that someone can please post a link to the Zener or LM317 battery substitue circuit?


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