[Heathkit] DX-40 Keying trouble

[Mike McCarty]

Curt wrote:
> Always use a VTVM on this old stuff for serious measurements, but the DVM 
> was in the drawer and just wanted to verify there was some voltage on the 
> key with key up.  I'd never trust anything my DVM told me on these 

The cathode is a low impedance point, so even a DVM should be ok there.

> hollowstate rigs.  I was surprised that somehow the DVM being connected 
> changed the behavior

That's the intriguiging point. I don't suppose the DVM is an old
one with LED display. Those sometimes inject digital noise into
the circuit. However, even that doesn't explain the situation
satisfactorily.

Mike
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