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Old 28th July 2014, 07:02 AM   #1
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Default 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
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Old 28th July 2014, 07:55 AM   #2
Tesla88 is offline Tesla88  Italy
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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 . . .
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Old 28th July 2014, 08:11 AM   #3
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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?!
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Old 28th July 2014, 08:15 AM   #4
freddi is offline freddi  United States
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http://frank.pocnet.net/sheets/129/e/EL34.pdf
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Old 28th July 2014, 08:42 AM   #5
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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.
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Old 28th July 2014, 10:08 AM   #6
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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 )

Click the image to open in full size.
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Old 28th July 2014, 10:34 AM   #7
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To avoid confusion, it isn't really an ultra-linear circuit. The person who wrote the spec. probably just meant 'very linear circuit'.
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Old 28th July 2014, 10:45 AM   #8
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Any help will be much appreciated.
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Old 28th July 2014, 10:46 AM   #9
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Thanks Malcolm for your clarification
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Old 28th July 2014, 10:53 AM   #10
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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 10:56 AM.
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