[ICOM] IC 756PROII value?

[Adam Farson]

Hi Clete,

By the same reasoning, the Soviets used tubes in all their mission-critical
electronics (e.g. in combat aircraft and even in missiles) for many years.
However, component engineers did not stand still; they went on to develop
radiation-hardened semiconductor devices.

By the time the old vacuum-tube sets were finally taken out of mothballs,
many capacitors and other components inside them had deteriorated to such an
extent as to render repairs uneconomical except by dedicated amateur
restorers. The manufacturers had long ago ceased production of those sets.

"In technology, there are but two degrees of freedom: forward and down.
There is no backwards."

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of C.Whitaker
Sent: 16-Jun-10 08:54
To: ICOM Reflector
Subject: Re: [ICOM] IC 756PROII value?

de WB2CPN
I suppose not many know this, but way back in the '60's when transistors
were coming in, DOD had a real fear that an atomic detonation at a high
altitude over the US would destroy a great many communications facilities if
they used transistors in critical circuits.   DOD gathered
up all the tube type transceivers, such as the Collins S-Line,
and stashed them inside the mountain in Colorado.   It
was years later that those radios finally got into the military MARS
channels.
73  Clete



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