Tom,
Just tug your defective meters probe wires holding the probes and do the same at the meter end.
These wires fray and probably that why you got low readings.
Raj
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At 15-05-18, you wrote:
PROBLEM SOLVED!
Well, actually two problems... initial problem was with voltmeter... it was providing erroneous readings. Once I swapped to newer voltmeter I was getting better measurements. Second problem was bad solder joint at electret mic end... it seems to be working now....
Thank you for your assistance.
Tom NU9R