From larrys–(at)–ol.com Sat Oct 26 00:18:50 CDT 1996
Article: 17031 of rec.audio.tubes
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From: larrys–(at)–ol.com (LarrySB)
Newsgroups: rec.audio.tubes
Subject: Re: Anyone tried Svetlana 6L6GC’s yet?
Date: 26 Oct 1996 00:45:53 -0400
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<<<<<<<< Interesting, I just went to the web site and read that the SV6L6GC is a tetrode as apposed to a true pentode power beam.
Any comments?
Thought the Sylvania STR387 was a pentode power beam.
>>>>>>>>>>>
Ahh! This is a classic source of confusion.
OK: here is the real deal:
All 6L6 series tubes are beam power tubes.
Now, some people disagree over whether a beam power tube is a Pentode or a
tetrode with beam forming plates. (the KT in tubes like KT-88 stands for
“kinkless tetrode”, which means it has beam forming plates).
Now, in a power pentode like the EL34, there is a third wire wound,
helical grid. For some people, this makes it a “true” pentode.
In a Kinkless tetrode, 6L6, beam power tube, there is a set of beam
forming electrodes instead of third wire grid.
In either case, the third (suppressor) grid or the beam forming plates
perform essentially the same job of suppressing secondary emmissions. In
either case, this electrode is almost always connected to the cathode,
either internally (for KT-xx, 6L6, 6550, 6V6, etc) or externally in the
case of the EL34 (on pin 1).
In most cases, the 6CA7 is beam power tube, but is a plug-in equivalent to
the EL-34.
Whether you want to call it a beam power pentode, kinkless tetrode or what
not, it’s really just a question of nomenclature.
The SV6L6GC is a true blue 6L6GC, and I can’t wait to get my hands on some
and try them out.
—
Dr. Nuketopia
Technology Director of the World-Wide Monetary Conspiracy
All opinions strictly reflect the party line.
Read the Blue Glow in Tubes FAQ at http://www.persci.com/~larrysb
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