Quote:
Originally Posted by David Simpson
Even if both boards are phooked, as long as the anode voltage can be safely applied to the anode via the 10 ohm resistor - you can still surely test valves, but in a long-winded way, so to speak. David
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Exactly right! I should have mentioned that much earlier when someone questioned the accuracy of the 163. Apart from using "standardised" valves, you can quite simply measure the changes of Ia as you twiddle the Vg knob and plot the line, (which takes seconds if you use Excel or similar) and when I've done that, the Gm values have been very close to the ones read off the Gm meter after all that "14kHz stuff". Maybe we should just forget the boards
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The serious mis-use of your materials, Martin, must be very "annoying" indeed.
B