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This video examines a vintage EICO model 221 VTVM, http://www.stevenjohnson.com/manuals/mfiles/eico221.pdf, which dates from the 1950s ...
YouTube-Radio Physics and Electronics
Introduction
Bridge circuit
Battery holder location
Potentiometer labels
Power transformer inspection
Leakage voltage measurements
AC volts measurement
Internal circuitry
Adjusting voltage scale
Conclusion