From greg–(at)–ud.lattice.com Thu Feb 22 13:51:33 CST 1996
Article: 6689 of rec.audio.tubes
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From: greg–(at)–ud.lattice.com (Grego Sanguinetti)
Newsgroups: rec.audio.tubes
Subject: Re: Bias curve for Sovtek 5881WXT?
Date: 21 Feb 1996 19:40:58 GMT
Organization: Lattice Semiconductor Corporation
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References: <3119df2e.70f--(at)--wdc.com> <4fgfgk$2p--(at)--ntpd.lkg.dec.com> <3121c9b8.376--(at)--wdc.com> <4g3lu8$v2--(at)--senetp1.news.prodigy.com>
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In article <4g3lu8$v2--(at)--senetp1.news.prodigy.com>,
Joseph Pampel wrote:
>O’Connor wrote:
>>
>>With respect to your observations about 5881 operation:
>>
>>427V at 30mA is only about 12W plate dissipation.
>>470V at 35mA is still only 16W of idle power. This will sound nice but
>>tube life decreases as idle dissipation is pushed closer to the limiting
>
>>value of 23W.
>
>I have set up 5881’s in amps at rehearsal studios at 16-18W and never had
>an amp come back. (and it’s been years..) (35-40mA–(at)–440-460Va typical
>set up range)
>
>Where did you get that 23W spec from? Mathews & assorted NS employee/tech

This is old news. The 23w rating is for the old 5881’s. These tubes that
Sovtek labels as 5881’s are NOT really 5881’s. OK?

The original 5881 was an industrial version of the 6L6GB. The Sovtek version
is more closely related to the 6L6GC.

The bottom line is that the Sovtek 5881WXT… is MUCH stronger than the
old 5881’s and will easily run 40mA at 460v. I set up an amp recently
running 500v at 65mA. I ran it that way for quite a while without
a single failure. relax and enjoy them.

-grego
—
—————————————————————————
Grego Sanguinetti, Lattice Semiconductor Corp. | Water, water everywhere,
greg–(at)–attice.com | but I’d rather drink beer.

From cign–(at)–elios.phy.OhioU.Edu Sat Feb 24 11:06:48 CST 1996
Article: 6753 of rec.audio.tubes
Newsgroups: rec.audio.tubes
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From: cign–(at)–elios.phy.OhioU.Edu (Dave Cigna)
Subject: Re: 5881s
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Date: Fri, 23 Feb 1996 15:55:52 GMT
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Clancy wrote:
>Tremolux wrote:
>>The 5881WXT is Sovtek’s version of their regular 5881 except with a
>>full-size base. Electrically, the 5881WXT is identical to Sovtek’s
>>regular 5881.
>
>how come they generally cost two dollars more each then?
>Is that just marketing?

Because you get an extra hunk of phenolic with the WXT. I couldn’t
figure out what “full-size base” meant until I saw one without. They
should have called the WXT “normal-size base” because the non-WXT
doesn’t really have much of a base at all. The bottom line is that if
your amp has ‘bear trap’ tube retainers then you need the WXT,
otherwise you can save a couple of bucks on the cheaper ones.

— Dave Cigna