Mr. Luddite wrote:
On 10/12/2018 8:50 PM, wrote:
On Fri, 12 Oct 2018 12:47:14 -0700 (PDT), Tim
wrote:
On Fri, 12 Oct 2018 14:34:56 -0400, "Mr. Luddite"
- show quoted text -
640w of waste heat coming out the vent sounds high to me. The vent on
mine is barely warm. I had more waste heat coming out of my satellite
receiver.
............
Lol!
That’s one thing fun about my vintage guitar amps. They’d get hot, you
could almost melt marshmallows over them. Think tubes. And I mean, toooobs!
Yeah "tubes" was when we thought the TV was the biggest user of
electricity ... and it might have been close if you had nat gas
appliances.
I was lucky that tubes were really just starting go away when I got
into the computer biz. I still carried a 25L6 and a 2D21 in my tool
bag. I did to a mail away electronic course when I was a kid where we
made a series of things ending up with an AM radio using the box of
parts we got each week. That was tubes.
In the days I attended ET school in the Navy tubes and tube circuitry
composed about 80 percent of the classes and school phases. It was good
though because it covered all the components required to make them do
their job and the theory and math behind them.
It wasn't until the last few phases that they got into digital circuits,
op-amps and TTL (5v) logic. CMOS and full circuit integrated "chips"
were still unheard of in those days.
Later, when attending civilian schools tubes were treated more as
historical artifacts but the circuit theory and component theory
remained much the same. I had a leg up on most of the people in
the classes I took, thanks to the Navy.
I went to NCR computer school before the service, so was transistor
trained. Tubes were the stuff you went down to the market and tested from
the TV and the oscillator tube that the Chevy radio used to generate the
different voltage in the radio. Most of my Air Force was tubes. Really
powerful tubes. TACAN which had about 3000 watt dummy load on low
voltage. 5000V on the tube. And then airborne radars, which were pretty
much tubes in the 1960’s and a Magnetron.