From larrys–(at)–ol.com Tue Sep 24 13:15:13 CDT 1996
Article: 109160 of rec.music.makers.guitar
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From: larrys–(at)–ol.com (LarrySB)
Newsgroups: rec.music.makers.guitar
Subject: Re: 6L6 vs. 5881?
Date: 24 Sep 1996 13:03:29 -0400
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<<< What exactly is the difference between a 6L6GC and a 5881? In particular, the question applies to the Sovtek >>>

That’s a good question.

I’m afraid Sovtek Marketing has confused what used to be simple part
numbers for tubes.

In the olden days when tubes were made in the USA, a 5881 was equivalent
to 6L6WGB. This tube had a improved mechanical structure, and was an
industrial/military designation for the 6L6WGB. The old timey 6L6GC was
an improved 6L6, with higher voltage and power dissipation ratings than
the original and the “B” series tubes. (the “g” means glass, the “c”
means third version, the “w” usually meant mechanically improved, the “b”
meant second version). The 7581 was the ultimate 6L6, with the highest
ratings and best mechanics.

OK, now that brings us to Sovtek.

In Sovtek parlance, the 5881W and WXT are their best 6L6 like tubes. The
WXT has a full size octal base. They are really re-labeling a Russian
military tube, which is called type 6pi33C (or something like that). It
aint a 6L6 or a 5881. But it is a rugged tube that is very similar to
those specs.

Sovtek also sells some kind of 6L6GB and 6L6GC, neither of which is as
good as their 5881WXT. Actually, their 6L6GB and GC are crap.

Confused?

Well so is everyone else.

Ok, the rules are this.

USA buy 6L6GC, which is better than 5881 and 6L6WGB.

Sovtek buy 5881WXT, which is better than their GC and GB.

In any case, you will likely find that the USA made tubes last longer than
the Sovtek.
—
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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