> -----Original Message-----
> From: IBM Mainframe Discussion List On Behalf Of Bass, Walter W
>
> > ------------------------------<snip>----------------------------
> > Tubes can be VERY noisy, electrically. Even if they're virtually
> > silent when you're standing there listening.
> > ------------------------------<unsnip>----------------------------
>
> I was a young lad I would watch (and listen) most intently as
> my father would frequently open up the back of our tube TV to
> effect repairs. I am quite certain that I recall hearing a
> steady background hum of mumbled curses emanating from the
> tubes. If you scale that up by the far greater number of
> tubes which a ca. 1950's computer must have contained vs. the
> 1950's TV, I'm quite certain the noise level might have been
> considered objectionable to some.
I remember my first (and last) radio kit emitted a barely audible
high-pitched "whine" when turned on. The only other detail I remember
are the tubes it used: One each 12SA7, 12SK7, 12SQ7, 50L6 and 35Z5.
-jc-
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