Hewlett-Packard 410B Vacuum Tube Voltmeter [Detail]  
Written by Accutron on 2008-01-30  

HP 410B vacuum tube voltmeter, serial number 024-45323. The blue case and bright blue non-riveted nameplate date the meter as an early 1960s unit.

Amperex EA53 rectifier, a rare and expensive tube that is often missing from surplus 410B units.

410B, left side internals.

410B, right side internals.

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