30 Aug
2008
30 Aug
'08
6:31 p.m.
On Sat, 30 Aug 2008, William Donzelli wrote:
Date: Sat, 30 Aug 2008 20:08:41 -0400
From: William Donzelli <wdonzelli at gmail.com>
Reply-To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
Subject: Re: Wanted: vacuum tube logic circuits
But they were used extensively in hearing aids...
Peter Wallace
As for pencil tubes ... I suspect most of them
where for WWII use and the
general public did not
know about them till after transistors made their impact.
No, they were quite known in the industry in the late 1940s.
Manufactures even had lines of subminiatures for the consumer market,
but they failed to make an impact - too expensive. The portables that
used them were out of reach for most pocketbooks, and frankly were not
all that much smaller than the portables that used regular minis.
--
Will