Sweep tubes and G3

rsumperl · 4th October 2010, 05:15 PM

Greetings,
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.

Thanks,
Ray

Tom Bavis · 4th October 2010, 08:01 PM

Search this board for "snivets" or"Barkhousen oscillation" for some interesting reading about the original use of these tubes...

DualTriode · 5th October 2010, 03:40 AM

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.
DT
All just for fun!

smoking-amp · 5th October 2010, 03:54 AM

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:
Suppresor Grid used for Feedback?

4th October 2010, 05:15 PM	#1
rsumperl diyAudio Member Join Date: Oct 2009 Location: Binghamton, NY	Sweep tubes and G3 Greetings, 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. Thanks, Ray

5th October 2010, 03:54 AM	#4
smoking-amp diyAudio Member Join Date: Dec 2001 Location: Hickory, NC	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: Suppresor Grid used for Feedback? __________________ Ohms Law V = I R

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4th October 2010, 08:01 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Search this board for "snivets" or"Barkhousen oscillation" for some interesting reading about the original use of these tubes...

5th October 2010, 03:40 AM	#3
DualTriode diyAudio Member Join Date: Aug 2009 Location: Sacramento	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. DT All just for fun!

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