Triode recommendation

zigzagflux · 18th October 2007, 07:30 PM

Interested in some tube recommendations for a 300B driver stage, essentially a Lynn Olson Karna (transformer coupled PP).

I am considering a design similar to K&K's, who uses the 6BX7GT double triode. Very low rp, octal socket, common tube, good price.

Are there any similar triodes I could use, but in singles? I haven't had the best luck finding reasonably balanced triodes in the same glass, and would prefer to buy singles such that matching is easier. Yes, I could go with triode strapped pentodes, but for now, are there any triode options?

Kind of like picking the 6J5 instead of a 6SN7.

Thanks.

EC8010 · 18th October 2007, 07:45 PM

6AH4?

zigzagflux · 19th October 2007, 02:58 AM

Wow, that would be a good choice, wouldn't it? Seems to be the exact same triode.

Thanks !!

tubelab.com · 19th October 2007, 12:23 PM

6CK4 is also cut from the same mold, and often easier to find. The 6EM7 / 6EA7 has two dissimilar triode sections. Use the high mu section for the first stage and the low mu section for the driver.

kevinkr · 19th October 2007, 04:50 PM

I've used the 6CK4 in SE applications to drive Tango NC-20 interstage into both 2A3 and 300B with good results. I imagine performance would be good driving a PP interstage as well.

MartinV56 · 19th October 2007, 05:14 PM

Best Regards,

http://www.fortunecity.com/rivendell...iertheory.html

Driver valve discussion

zigzagflux · 19th October 2007, 06:51 PM

The 6CK4 and 6AH4 have essentially the same pinout; this is good. I can design the amp for a little extra filament capacity, and attempt some tube swapping.

I'll likely use an adjustable CCS in the tail, so could swap out the tubes and adjust current to suit.

Good suggestions. I like the idea of using TV tubes; they seem readily available (based on the prices I see) and one triode per tube.

18th October 2007, 07:30 PM	#1
zigzagflux diyAudio Member Join Date: Oct 2006	Triode recommendation Interested in some tube recommendations for a 300B driver stage, essentially a Lynn Olson Karna (transformer coupled PP). I am considering a design similar to K&K's, who uses the 6BX7GT double triode. Very low rp, octal socket, common tube, good price. Are there any similar triodes I could use, but in singles? I haven't had the best luck finding reasonably balanced triodes in the same glass, and would prefer to buy singles such that matching is easier. Yes, I could go with triode strapped pentodes, but for now, are there any triode options? Kind of like picking the 6J5 instead of a 6SN7. Thanks.

18th October 2007, 07:45 PM	#2
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	6AH4? __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

19th October 2007, 12:23 PM	#4
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	6CK4 is also cut from the same mold, and often easier to find. The 6EM7 / 6EA7 has two dissimilar triode sections. Use the high mu section for the first stage and the low mu section for the driver. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

19th October 2007, 04:50 PM	#5
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	I've used the 6CK4 in SE applications to drive Tango NC-20 interstage into both 2A3 and 300B with good results. I imagine performance would be good driving a PP interstage as well. __________________ "Extraordinary claims require extraordinary evidence." - Carl Sagan

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19th October 2007, 02:58 AM	#3
zigzagflux diyAudio Member Join Date: Oct 2006	Wow, that would be a good choice, wouldn't it? Seems to be the exact same triode. Thanks !!

19th October 2007, 05:14 PM	#6
MartinV56 diyAudio Member Join Date: Nov 2006	Best Regards, http://www.fortunecity.com/rivendell...iertheory.html Driver valve discussion

19th October 2007, 06:51 PM	#7
zigzagflux diyAudio Member Join Date: Oct 2006	The 6CK4 and 6AH4 have essentially the same pinout; this is good. I can design the amp for a little extra filament capacity, and attempt some tube swapping. I'll likely use an adjustable CCS in the tail, so could swap out the tubes and adjust current to suit. Good suggestions. I like the idea of using TV tubes; they seem readily available (based on the prices I see) and one triode per tube.

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