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In most tubes you can see the two pins that go to the filaments. Its the two pins that go to the inner most parts of the stuff in the tube. There will be 2 pins that come up and bend towards the center of the lower parts for the workings of the tube. These pins will look similar on most tubes, no matter the number of pins. If there is any question, look at a working tube on something you have. With a little practice you will be able to easily spot them in the future. Not this easy on metal tubes..... Test with an ohm meter on its lowest scale Rx1 A reading of what looks like 0 or close 10 ohms depending on your meter is a good filament. Infinity or OL (open load) as some digital meters say when the test leads are not touching is a bad or open filament.
From Zeno:
For filaments MOST the time
7 pin min. 3&4
9 pin min. 4&5
12 pin compactron 1&12
This is correct, look at these pins, you will see the distinctive signs these pins feed the filaments.
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Last edited by Username1; 03-30-2013 at 12:17 PM.
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