#49: HP-410B: Initial tests

56:03
#50: HP-410B: Interior and initial calibration

42:43
#52: EICO 667: Initial testing

1:41
Making Tiny Coils for Antique Headphones

44:46
HP410B Restoration And Alignment More Was Wrong Than I Thought

27:23
HP 400EL AC Voltmeter Overview

26:37
#53: EICO 667 after repairs and calibration

23:07
Pourquoi la vitesse de la lumière est si lente ?

47:48