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Old 4th October 2002, 04:23 PM   #1
Rino odorico is offline Rino odorico  Canada
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Default Testing Tubes

Hey all, could it be possible to test tubes without a tube tester.
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Old 4th October 2002, 06:21 PM   #2
Rino odorico is offline Rino odorico  Canada
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Sorry, I ment it as a question...forgot to put the ? on the end. To late to edit it (surpassed the 30 minute rule).

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Old 4th October 2002, 06:31 PM   #3
jackinnj is offline jackinnj  United States
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Testing Tubes
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the first thing which any DIY tube test is to see whether the heater is open (ohmeter), then check to see whether there are any shorts between plate, screen, cathode etc.

to measure transconductance, which is just <em>dI(plate)/dv(grid)</em> -- let's assume that you have a HV power supply like a Heath IP17 -- you can use the following setup from the RCA receiving tube manual in which a 1.5 volt battery is used to "shift" the grid voltage (dV=1.5).
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