SE EL84 output stage?

Lingwendil · 26th June 2008, 02:00 PM

Hi, I was just wondering if it was possible to set up an all tube amplifier for use after a yaha/soha style SE gain stage. If it can go with output caps instead of trafos that would be nice. Is it possible? I've seen somewheres an EL84 used as a kathode follower with an LM317 set as a 40mA CCS, reminiscent of a szekeres circuit. It had output caps of around 470uF. What would be the lowest b+ I could use? Any help would be awesome

jerluwoo · 26th June 2008, 11:23 PM

If I were to use an el84 as cathode follower I would use 250v across the tube. Thats 250v + voltage across the ccs load. So if you have say 20v across the ccs then use B+ of 270v.

Lingwendil · 29th June 2008, 05:55 PM

any good discrete ccs for that high of a voltage?

26th June 2008, 02:00 PM	#1
Lingwendil diyAudio Member Join Date: Apr 2008	SE EL84 output stage? Hi, I was just wondering if it was possible to set up an all tube amplifier for use after a yaha/soha style SE gain stage. If it can go with output caps instead of trafos that would be nice. Is it possible? I've seen somewheres an EL84 used as a kathode follower with an LM317 set as a 40mA CCS, reminiscent of a szekeres circuit. It had output caps of around 470uF. What would be the lowest b+ I could use? Any help would be awesome

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26th June 2008, 11:23 PM	#2
jerluwoo diyAudio Member Join Date: Feb 2006 Location: Ashland,Ky U.S	If I were to use an el84 as cathode follower I would use 250v across the tube. Thats 250v + voltage across the ccs load. So if you have say 20v across the ccs then use B+ of 270v.

29th June 2008, 05:55 PM	#3
Lingwendil diyAudio Member Join Date: Apr 2008	any good discrete ccs for that high of a voltage?

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