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howthingswork · How Things Work: ideas and discussion

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Activity within 7 days:

Description

The original mission:

This is a discussion group for people interested in technical education. "How Things Work" is a project
to teach non-technical people (e.g., your mother) about
the man-made world--from reinforced concrete to digital
audio. Our group, open to anyone, discusses strategies
for teaching and construction of demonstrations. Some of the philosophy and details of this particular project can be found at http://www.mkinsler.com.

What it is now:
It's turned into what's best described as a mutual education society with a technological flavor. Most of the discussion seems to involve technologies of some sort--i.e., how something works or how things are done. There are about 75 enthusiastic members who are polite to each other and who teach the Group Owner a very great deal.


Group Moderator: howthingswork-owner@egroups.com

To subscribe, send a message to howthingswork-subscribe@egroups.com or go to this e-group's home page at http://www.egroups.com/list/howthingswork

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Re: the warm, mystical, primordial glow of the vacuum tube filament.
From: "eng2718284" <haugeeng@...> ... Thanks! Okay, so the plate is providing roughly half the total thermal power of the device. Wouldn't have
Posted - Fri Jul 10, 2009 3:25 am
Dave Typinski
davewingnut
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Re: the warm, mystical, primordial glow of the vacuum tube filament.
... That's because it is a fashionable tube, used in (cough) high-end tube-type audio amplifiers along with the 6L6. If you only know enough about tubes to be
Posted - Fri Jul 10, 2009 3:15 am
Mark Kinsler
kinsler33
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Re: the warm, mystical, primordial glow of the vacuum tube filament.
... Yeah, and sometimes they'll glow, though they're not supposed to. There was a breed of low-profile amplifiers that used a sort of miniature high-power
Posted - Fri Jul 10, 2009 3:03 am
Mark Kinsler
kinsler33
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Re: the warm, mystical, primordial glow of the vacuum tube filament.
... 12AX7 - dual triode. Filament = 12.6 V 0.15 A (or 6.3 V 0.3 A) Plate dissipation = 1.2 W each side Filament only = 1.9 W; full load = 4.3 W I remember that
Posted - Fri Jul 10, 2009 2:57 am
eng2718284
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Re: the warm, mystical, primordial glow of the vacuum tube filament.
From: "Mark Kinsler" <kinsler33@...> ... That's just... sad. Y'know, that sort of information leads me to wonder whether the doomsayers aren't correct
Posted - Fri Jul 10, 2009 1:56 am
Dave Typinski
davewingnut
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