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Sweep tubes and G3
Sweep tubes and G3
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Old 4th October 2010, 05:15 PM   #1
rsumperl is offline rsumperl  United States
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Sweep tubes and G3
Default Sweep tubes and G3

There are some sweep tubes that have G3 separate from the cathode connection. Is there any advantage to having a small positive voltage on G3 instead of grounding it? On the tubes that have G3 separate, some of the tube sheets suggest 30 or so volts.

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Old 4th October 2010, 08:01 PM   #2
Tom Bavis is offline Tom Bavis
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Search this board for "snivets" or"Barkhousen oscillation" for some interesting reading about the original use of these tubes...
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Old 5th October 2010, 03:40 AM   #3
DualTriode is offline DualTriode  United States
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Hello All,
I would say that G3 is another electrode to play with. Who knows how many watts it can dissipate before it blows up. Perhaps G3 drive? Perhaps a place to inject feedback?
More grids is equal to more variables = combinations and permutations.
Plan out a few what ifs and hook one up to a curve tracer.
All just for fun!
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Old 5th October 2010, 03:54 AM   #4
smoking-amp is offline smoking-amp  United States
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g3 doesn't have much effect for control use except in some special dual control tubes which have a fine mesh g3. Take a look at this link on g3 effects:
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