On Fri, 12 Oct 2018 21:04:44 -0400, "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.

They talked about tubes in FT school but it was clear they thought the
world was going to transistors.
We really spent more time on more archaic things like servos and mag
amps. There was also a lot more on basic theory and the fire control
problem since they did not have a clue what system we would study in B
school. It could have been the precursor to Ageis (too secret for us
to know about) or the Mk 1 system they had on the USS Arizona. I was
challenged by FTA school but I am not sure what I took away from it
other than a few basic concepts, some study habits and what Harry
would call the college experience.