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6N2P - WHAT THE?????????????
6N2P - WHAT THE?????????????
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Old 2nd October 2010, 08:26 PM   #41
DF96 is offline DF96  England
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I always like it when a mystery is solved! As long as the screen is sufficiently negative to not attract electrons it won't affect the triodes, as all electrons will end up on the anode as they should. A very negative screen could at most discourage electrons from landing on the anode near the hole. A sufficiently positive screen will steal electrons, especially when the anode voltage is low. I suppose there will be some capacitive coupling to the screen too.
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Old 23rd August 2012, 07:24 PM   #42
Niquel is offline Niquel  Spain
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Does anybody know what are the differences between 6N2P and 6N2P-EV?

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Old 23rd August 2012, 09:56 PM   #43
TheGimp is offline TheGimp  United States
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E - Extended Life
V - has sturdier construction including additional mica.

Last edited by TheGimp; 23rd August 2012 at 10:06 PM.
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Old 24th August 2012, 02:08 PM   #44
palmas is offline palmas  Portugal
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depends on the circuit:
when you powerup the tube, static voltage will elevate pin9 voltage to a point where the other cathode may conduct to pin9 (like a diode). Once you discharge it, it'll keep lower voltage, that will buld much slower or not att all than when powerup.
Always keep pin 9 to ground or a dc steady reference, and also reduce the chance for oscilating.
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Old 13th May 2016, 06:27 AM   #45
DualTriode is offline DualTriode  United States
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Am I too late?

Some of these 9-pin tubes pin number 9 is mid-point on the heater. In this case you do not want to ground pin number 9.

What works for me is to connect a 0.1 uf capacitor between pin 9 and ground.

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Old 13th May 2016, 01:42 PM   #46
DF96 is offline DF96  England
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Let us be clear: it is not pin 9 which needs to be grounded, but the shield/screen (if present) which may be connected to pin 9.

A quite separate issue is establishing a DC voltage reference for the heater, so the heater does not become another floating electrode within the valve. Using a capacitor is not sufficient for this, unless the capacitor is quite leaky.
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