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For comparison, the bulb's 'normal' is at its rated 6.3V (/ 250ma.).
The bulb would need to be located physically at the plate cap, because there's several thousand volts of pulse there. Running wires around would introduce an arcing hazard.
The alternative would be the cathode leg since there's no arcing hazard and you can run wires around with no problem.
But in the K leg, the bulb will introduce a few volts of negative grid bias plus a bit of negative signal feedback. This will reduce the gain a bit, which may or may not be a problem.
The feedback can be cut by bypassing the bulb with an electrolytic (maybe 1000 uf @ 10V.).
Of course a milliameter in the K leg would be ideal since it's essentially a short and would need no bypassing.
Last edited by old_coot88; 09-27-2014 at 10:50 AM.
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