Wow.

Yes, I had always heard the stories of that happening, but never saw one. Mine is almost hard to see, it didn't cave in the surrounding glass--just a very slight stress crack and a little inverted pimple where the hole is. Filaments still good. Sweep tubes....hate em even tho they have given me excellent service thru the years.

On 12/22/2011 9:19 PM, Jim Shorney wrote:
On Thu, 22 Dec 2011 12:54:59 -0500, Curt wrote:

It
got so hot, the glass melted and a hole was sucked thru the side without
breaking the rest of the tube.
I saw something similar years ago in a sweep that was pulled from one of those
horribly designed 11-Meter amps. The glass  had been sucked inward and melted
to the outside of the plate structure in one spot. It's been over 35 years ago,
but I think I recall that the vacuum actually held.

73

-Jim


--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, 
HyGain 3750, IBM PS/2 - all vintage, all the time!

"Give a man a URL, and he will learn for an hour; teach him to Google, and he will 
learn for a lifetime."

HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
http://incolor.inetnebr.com/jshorney
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