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Old 20th May 2020, 10:43 pm   #26
Silicon
Nonode
 
Join Date: Jun 2007
Location: Coulsdon, London, UK.
Posts: 2,152
Default Re: Safe to apply mains?

If you search for 'quick CRT test' on the internet you may find the antiqueradios.com web page.

They use a 6V DC power supply to energise the heater.

In addition 6V positive goes directly to the G1 pin.

The 6V negative goes to the cathode via a 1k resistor. A Voltmeter is wired across the resistor to effectively measure the current through the cathode.

They say that a 4V reading can be expected from a good CRT and 1 Volt from a well used tube.

It should work with 12V DC. However the interpretation of the results will be different.
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