From: Philip Nasadowski
Subject: Re: Digital divide by ten, 1949 style
Date: Fri, 20 Sep 2002 17:37:39 -0400
Organization: Biker/metalhead from hell!!!
References: <3D84D4B3.50B511EF@webaccess.net> <firstname.lastname@example.org> <3D893F55.1712189F@mfi.net>
NNTP-Posting-Date: 20 Sep 2002 21:41:07 GMT
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In article ,
"Geoffrey G. Rochat" wrote:
> That might have been something like a 6BH11 (dual medium-mu triodes,
> sharp cutoff pentode), or a 6B10 (twin diode, dual medium-mu triodes).
Here's a list of the 10HE chassis, and the tubes and what they do.
1DG3A HV rectifer
12JF5 H out
6LT8 H osc
11FY7 Vert osc/out
6AC10 Color Out
8BU11 Burst Amp, clip, gate
12BF11 Sound Det / out
11BT11 Vid amp, keyer, audio IF
8BQ11 3rd IF, chroma amp
8AR8 1st IF, 2nd IF
10VABP22 Pix tube
That's a whole *color* TV, with fewer tubes than the average B&W TV of
The sound detector/output is a dual pentode. The detector is a gated
beam tube, the output is a standard power pentode.
> The 6AL11, for example, with a beam power tube and a sharp cutoff
That's another FM detector / output combo.
On paper, it'd be possible to build an entire FM set with just 2
compactrons and 1 or 2 minis. One mini would be RF amp, then the next
would be osc/mixer, then a single compactron as a 2 stage IF, then
another as a detector and output. Use a sillicon diode voltage doubler
supply, and bingo. Granted it'd be a crappy set, but hey.
> I've always been interested in triple triode tubes such as the
> 6U10; most of a tube op-amp in one bottle.
Triple triodes lend themselves to chroma amp circuits, or stuff like
that. Op amps can easily happen as 2 12AX7s or such. AFAIK, nobody
ever made a quad triode, though there were quad diodes of various types
(6JU8 was seen in lots of color TVs), and dual triode dual diode combos.
Towards the end, they got really funky with some tubes, too - dual
plates, dual control grids, etc.
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