From kee–(at)–ustin.ibm.com Thu Mar 21 12:58:33 CST 1996
Article: 11727 of alt.guitar.amps
Path: geraldo.cc.utexas.edu!cs.utexas.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!ausnews.austin.ibm.com!keen
From: kee–(at)–ustin.ibm.com ()
Newsgroups: alt.guitar.amps
Subject: Re: 6CA7
Date: 21 Mar 1996 14:40:28 GMT
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In article <4iqmi4$bf--(at)--ewsbf02.news.aol.com>, timtub–(at)–ol.com (TimTube) writes:

>
> I do have an interesting Sovtec EL34 that has the same shape bottle and
> the components look identical to a 6CA7, possibly a prototype. I pulled
> this out of a Mig 60 that was in on repair. There is a bullet shaped hole
> in the bottle. Apparently, the tube got so hot that it melted the glass
> and it sucked into the plate? Anyone else ever see a tube do this?

I keep an exhibition set of interesting tube failures. I have two of these,
one a 5881 that melted the glass just to softness and has a fingertip sized
indentation on one side and the prints of the tips of the mica spacers
showing through the glass at the top and bottom of the straight section of
side; the other is an EL-84 that has a cone sucked all the way in til it hit
the plate and vented. The glass cooled so fast that it snapped in a crack
around the tube.

Sure enough, both owners noted that “It sounded really great just before
it blew…”

R.G.

 

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