EL300 = 6FN5 / PL300 = 35FN5 tube

hidnplayr · 21st December 2011, 11:13 AM

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)

Kay Pirinha · 21st December 2011, 05:26 PM

Hi,

as for all TV sweep tubes I suspect poor performance when considering single-ended class A mode. However, push-pull should work.

Yvesm · 21st December 2011, 06:26 PM

Some make amazing triodes . . .

hidnplayr · 22nd December 2011, 06:39 AM

Quote:

Originally Posted by Yvesm

Some make amazing triodes . . .

Exactly what i'd like to find out..

Yvesm · 22nd December 2011, 07:52 AM

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.

hidnplayr · 22nd December 2011, 07:56 AM

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?

Yvesm · 22nd December 2011, 08:24 AM

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

hidnplayr · 22nd December 2011, 09:53 AM

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?

hidnplayr · 10:57 AM

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?

Yvesm · 22nd December 2011, 01:07 PM

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)

?

22nd December 2011, 07:56 AM	#6
hidnplayr diyAudio Member Join Date: Sep 2008	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? __________________ Real tubes have top-caps

22nd December 2011, 09:53 AM	#8
hidnplayr diyAudio Member Join Date: Sep 2008	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? __________________ Real tubes have top-caps

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21st December 2011, 05:26 PM	#2
Kay Pirinha diyAudio Member Join Date: Oct 2011 Location: Tauberbischofsheim, Germany	Hi, as for all TV sweep tubes I suspect poor performance when considering single-ended class A mode. However, push-pull should work.

21st December 2011, 06:26 PM	#3
Yvesm diyAudio Member Join Date: Jul 2004 Location: Ardeche	Some make amazing triodes . . .

22nd December 2011, 08:24 AM	#7
Yvesm diyAudio Member Join Date: Jul 2004 Location: Ardeche	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

22nd December 2011, 01:07 PM	#10
Yvesm diyAudio Member Join Date: Jul 2004 Location: Ardeche	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) ?