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Old 21st December 2011, 11:13 AM   #1
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Default EL300 = 6FN5 / PL300 = 35FN5 tube

Anybody here knows this tube, or better yet, has used it in audio?

datasheet: http://www.mif.pg.gda.pl/homepages/f...020/6/6FN5.pdf (in french)
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Old 21st December 2011, 05:26 PM   #2
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Hi,

as for all TV sweep tubes I suspect poor performance when considering single-ended class A mode. However, push-pull should work.
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Old 21st December 2011, 06:26 PM   #3
Yvesm is offline Yvesm  France
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Some make amazing triodes . . .
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Old 22nd December 2011, 06:39 AM   #4
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Quote:
Originally Posted by Yvesm View Post
Some make amazing triodes . . .
Exactly what i'd like to find out..
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Old 22nd December 2011, 07:52 AM   #5
Yvesm is offline Yvesm  France
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Unfortunatly I've no curves available for this tube.
Just look at one of its cousins: EL/PL36
Not worst than a 2A3, no need for DC heater and a bit easier to drive

Yves.
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Old 22nd December 2011, 07:56 AM   #6
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Yes, I am familiar with the PL36
Is it possible to create the triode curves from the pentode curves?
Or is the only accurate method to measure them?
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Old 22nd December 2011, 08:24 AM   #7
Yvesm is offline Yvesm  France
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The data sheet does not tell anything above 200 Vanode and only for 3 screen values, I fear that extrapolation be very approximate !

If you aren't lazy, 2 adjustable power supplies and 3 DVM is just what you need to measure . . . along with pen and paper . . . or a calc sheet
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Old 22nd December 2011, 09:53 AM   #8
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Ok I measured the characteristics with my scope (with individual grid settings)
Now I need to combine those characteristics into one, I could use excel, but maybe you know a better program for this?
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Old 22nd December 2011, 10:35 AM   #9
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Tadaaa!

Left most curve is 0V, from there on i used 5V increments.
Dissipation curve drawn is for 22,6 W (17,6+5) but I believe this tube can handle some more...

Now how do I calculate mu, rp, ideal plate load etc?
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File Type: gif pl300-triode.gif (49.5 KB, 163 views)
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Old 22nd December 2011, 01:07 PM   #10
Yvesm is offline Yvesm  France
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Hey, you're going fast ! !
Do you have some numeric series as f.e.
Ua, Ia, Vg
50, 80,0
100, 270, 0
150, 480, 0
. . .
50, 10, -10
100, 75, -10
etc ... (values roughly estimated from your picture)

?
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