Tube Stability
From postmaste–(at)–riodeel.com Thu Aug 12 11:45:11 CDT 1999
fiftywat–(at)–ahoo.com wrote:
I think you answered your own question, your experience indicates
I believe your amp tech friend is referring to thorium when he
I’ve seen some really, really old (we’re talking 30′s & 40′s stuff)
–
Article: 195512 of alt.guitar.amps
Path: geraldo.cc.utexas.edu!cs.utexas.edu!news.maxwell.syr.edu!sunqbc.risq.qc.ca!novia!sequencer.newscene.com!not-for-mail
From: Ned Carlson
Subject: Re: NOS Tube stability
Date: 12 Aug 1999 03:18:01 -0500
Organization: Triode Electronics
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Xref: geraldo.cc.utexas.edu alt.guitar.amps:195512 rec.audio.tubes:133014
> A respected amp tech friend of mine now tells me that these old stock
> tubes still have unstable elements inside that are not inert and that
> NOS tubes are not reliable and essentially deteriorate over time even
> if they have never been used. Comments anyone?
otherwise, and you done seen & heard it yourself.This equates
with my experience.
refers to “unstable elements”. AFAIK, the types of tubes used in
guitar amplifiers do not contain thorium.
tubes with a little layer of white sheen on the getter.
This will only happen if there are gasses in the tube to react with the
getter, whether the gasses in question were from the inside of the
tube or migrated through the glass, I don’t know.
Ned Carlson Triode Electronics “where da tubes are!”
2225 W Roscoe Chicago, IL, 60618 USA
ph 773-871-7459 fax 773-871-7938
12:30 to 8 PM CT, (1830-0200 UTC) 12:30-5 Sat, Closed Wed & Sun
http://www.triodeel.com
