Quote:
Originally Posted by Heatercathodeshort
Don't forget the humble neon test screwdriver and a 15W pygmy bulb on a length of 'test wire'.
As a very young kid that bulb got many jumble sale receivers working.
Bright = high AC
Dull and maybe pulsing slightly = DC.
You learn by the reaction of the bulb filament to the character of the voltage rather like the speed of the AVO 8 needle when presented with a S/C. Happy Days!The lessons learned by these very simple bits of 'high tech' test gear proved of great value in later life when called in to carry out an emergency repair without warning, tools or any test equipment.
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Its surprising what can be used. The 15W pygmy lamp,connect one wire to mains live,and you have an AF sig gen, other to grid of OP valve,will also check frame timebase,but dont do this with transistor equipment.