power output of EL34 - diyAudio
 power output of EL34
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 28th July 2014, 06:02 AM #1 diyAudio Member     Join Date: Aug 2012 Location: Singapore power output of EL34 Hi All, I am intending to get a kit el34 intergrated amplifier for diy. With 6SL7 as the pre section. Need to know how can i have better/greater power output than 13w per channel max as spec.? As i see from spec sheet EL34 can output greater power than 13w. Have it got to do with the power transformers and outputtransformer? Thanks
 28th July 2014, 06:55 AM #2 diyAudio Member     Join Date: Dec 2011 Location: Italy Any link to the kit you watching? As long as we don't know circuit topology and class of operation , it's impossible to say... Are we talking about 1 EL34 or pair ? With only one EL34 per channel you have a SE class A amp with 8W typ. sine power . With a pair of EL34 you can get more power in push pull , but again , output power vary with plate voltage , primary impedance of Output transformer , Class of operation A - Ab1 - Ab2 and output stage connection Pentode - UL - Triode. For ex. a push pull , triode connected , class A would give about 15W . . .
 28th July 2014, 07:11 AM #3 diyAudio Moderator     Join Date: Jan 2011 Location: In Transient Since the max Pda for the EL34 is only 25W, the 13W output figure (which seems to suggest that it is SE) already exceeds the maximum possible Class A efficiency of 50%, in a real circuit, that figure is going to be lower, so in other words, the 13W rating is already an exaggeration - you may want to ask the seller, what is the distortion at 13W or how long is the expected tube life?!
 28th July 2014, 07:15 AM #4 diyAudio Member     Join Date: Aug 2005
 28th July 2014, 07:42 AM #5 diyAudio Member     Join Date: Aug 2012 Location: Singapore Yes the configuration is for a SE amplification with a distortion level of less than 1% as stated by the seller. K will try to get korre details and post it uphere. Thanks for the help.
 28th July 2014, 09:08 AM #6 diyAudio Member     Join Date: Aug 2012 Location: Singapore Hi, attached are the kit details and schematics Features and spec: Simple electronic circuit,Ultra linear amplification circuit Automatic bias Using 5H choking coil to filtering 5Z3P tube rectifier 6N9P preamplifier EL34-B power amplifier Max Output Power 13W X 2 Load: 4Ohm or 8Ohm Harmonic distortion: =<1% SNR: >= 89dB Input sensitivity: 600mV - 1V Input impedance: 100KΩ (stereo input) Frequency response: 20Hz - 26KHz THD: =<0.5% (1KHz) Silkscreen stainless steel Recommend minimum configuration: Bass woofer size : 6.5'' inch Sensitivity: >= 90db (very important )
 28th July 2014, 09:34 AM #7 diyAudio Member     Join Date: Apr 2014 Location: Derbyshire, UK To avoid confusion, it isn't really an ultra-linear circuit. The person who wrote the spec. probably just meant 'very linear circuit'.
 28th July 2014, 09:45 AM #8 diyAudio Member     Join Date: Aug 2012 Location: Singapore Any help will be much appreciated.
 28th July 2014, 09:46 AM #9 diyAudio Member     Join Date: Aug 2012 Location: Singapore Thanks Malcolm for your clarification
 28th July 2014, 09:53 AM #10 diyAudio Moderator     Join Date: Jan 2011 Location: In Transient As mentioned, the schematic does not show an UL connection, and using the figures provided above, the output power is a lot less than the 13W spec'd... 15/300 = 0.05, Po = 0.05^2*3500 = 8.75W even asssuming zero winding loss in the output transformer. Last edited by jazbo8; 28th July 2014 at 09:56 AM.

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