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Those Magnificent Television Tubes
Those Magnificent Television Tubes
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Old 5th January 2018, 08:19 PM   #1011
Wavebourn is offline Wavebourn  United States
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Those Magnificent Television Tubes
Triodes, tetrodes, does not matter how you call them, if grids are made of one or 2 rods. They act deflecting beams.

Click the image to open in full size.
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Old 7th January 2018, 09:39 PM   #1012
Wavebourn is offline Wavebourn  United States
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Those Magnificent Television Tubes
You can see constant gm between -2 and -0.5V
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Old 7th January 2018, 10:27 PM   #1013
Wavebourn is offline Wavebourn  United States
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Those Magnificent Television Tubes
This one has 2 control "grids":

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Old 9th January 2018, 12:04 AM   #1014
piano3 is offline piano3  United Kingdom
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what's it for this 1j37b?
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Old 9th January 2018, 01:44 AM   #1015
Wavebourn is offline Wavebourn  United States
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It was used for frequency converters in superhets. 2 rods as "control grids", for intermodulation between 2 signals. But can be used as a CCS in the "constant gm" region of currents, as early suggested by Don.
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Old 9th January 2018, 02:00 AM   #1016
TonyTecson is offline TonyTecson  Philippines
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Those Magnificent Television Tubes
anyine looked at the 954 pentode? looked linear too.,954 @ The Valve Museum
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Old 9th January 2018, 04:32 AM   #1017
Wavebourn is offline Wavebourn  United States
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Quote:
Originally Posted by TonyTecson View Post
anyine looked at the 954 pentode? looked linear too.,954 @ The Valve Museum
Looks like an ordinary low current pentode, with variable gm. Pretty linear, though.
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Old 9th January 2018, 03:45 PM   #1018
Tubelab_com is offline Tubelab_com  United States
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Quote:
looked at the 954 pentode?
The 954 pentode was a WWII attempt at raising the maximum operating frequency of a conventional (non planar) vacuum tube by shrinking the guts. Of course this also reduces the voltage and power that can flow through it. It is basically a shrunken 6AK5 (5654) tube. There is a 7 pin miniature version, the 9001 that shares the same pinout as the 6AK5. I have some of those around here, but don't remember anything special about them.....maybe I'll try them again when I get back to ultra high gain circuits where microphonics become a problem.
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Old 18th January 2018, 12:06 AM   #1019
TonyTecson is offline TonyTecson  Philippines
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@smoking-amp, do you have triode curves of the 6LU8/6LR8?
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Old 18th January 2018, 05:16 PM   #1020
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Here are some triode mode curves for (the pentode of) a Montgomery Ward USA 6LU8 tube (looks like Sylvania construction, but measures closest to a GE 6LU8 I have)

Vertical 20 mA/div, Horiz. 50V/div, Grid1 4V steps down from 0V

I measured a Sylvania tube and was similar except 7% less Mu.
I measured a GE tube and was nearly identical.
I measured an RCA tube and that had higher Rp (the grid 1=0V line at 200 mA was at 150V plate instead of near 100V plate for the others.) Noticeable roll-over in the curves too. If the other 6LU8 RCA tubes I have measure like that, I'm throwing them all out.
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File Type: jpg rsz_6lu8_t_20ma_50v_4v.JPG (194.1 KB, 271 views)

Last edited by smoking-amp; 18th January 2018 at 05:31 PM.
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