How do I achieve more output power?

apxp · 16th October 2006, 02:13 AM

I am in the middle of building my first tube amp and would like to know the best way to increase the power output. Currently the max is 4.5 WPC with this tube config:
12AU7/ECC82 Pre-Amp tubes
6BQ8/EL84 Power Output tubes
Obviously, I am new at this, so any and all help will be appreciated.

ray_moth · 16th October 2006, 03:04 AM

You need to tell us a little more about the schematic you're using. EL84 is capable of producing 10-12 watts in push-pull class AB1 ultralinear mode and probably a few more watts in pentode mode. It sounds as if your schematic could have them strapped in triode-mode, which, I guess, would give about the power you're quoting.

vax9000 · 16th October 2006, 03:07 AM

Max dissipation of EL84 is 12W, and 4.5W is about right from it. The best way to increase output is to use a bigger tube. The second best is to use push-pull circuit. The easiest is to run EL84 with more power dissipation than rated. But this will significantly shorten its life.

Wavebourn · 16th October 2006, 04:29 AM

You may parallel output toobs, but output transformer must be designed correspondingly.

ray_moth · 16th October 2006, 07:36 AM

Are you using a single-ended design or push-pull?

16th October 2006, 02:13 AM	#1
apxp diyAudio Member Join Date: Oct 2006	How do I achieve more output power? I am in the middle of building my first tube amp and would like to know the best way to increase the power output. Currently the max is 4.5 WPC with this tube config: 12AU7/ECC82 Pre-Amp tubes 6BQ8/EL84 Power Output tubes Obviously, I am new at this, so any and all help will be appreciated.

16th October 2006, 04:29 AM	#4
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	You may parallel output toobs, but output transformer must be designed correspondingly. __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

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16th October 2006, 03:04 AM	#2
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	You need to tell us a little more about the schematic you're using. EL84 is capable of producing 10-12 watts in push-pull class AB1 ultralinear mode and probably a few more watts in pentode mode. It sounds as if your schematic could have them strapped in triode-mode, which, I guess, would give about the power you're quoting.

16th October 2006, 03:07 AM	#3
vax9000 diyAudio Member Join Date: May 2006 Location: Cleveland	Max dissipation of EL84 is 12W, and 4.5W is about right from it. The best way to increase output is to use a bigger tube. The second best is to use push-pull circuit. The easiest is to run EL84 with more power dissipation than rated. But this will significantly shorten its life.

16th October 2006, 07:36 AM	#5
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	Are you using a single-ended design or push-pull?

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