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31st October 2011, 03:21 AM
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#1 |
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diyAudio Member
Join Date: Sep 2011
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24V powered 6N11 amplifier, 0.25% distortion, pretty good!
Some days before I started a thread to discuss the possibility of designing a low voltage tube amplifier. Almost all the reply posts said there'll be a big distortion. I decide to get a audio analyzer to make sure how big the distortion will be. Today the VP-7732A arrived, I did a test on my 24V powered 6N11 tube headphone amplifier. To my surprise, the distortion is only 0.25%, pretty good for a tube amp. The schematic is similar like this:
 The input signal is 100mVp-p and output is 722mVp-p. When input signal increase to 200mV, output is 1.4V, distortion increased to 1.5%, still acceptable for tube amp 
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31st October 2011, 09:57 PM
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#2 |
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diyAudio Member
Join Date: Dec 2009
Location: London
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Not very much in my view. I measured around 0.03% for an 4P1L or 26 stage with 1vrms input. Then for a 6sn7 driver stage at full output swing (100Vpp) an average of 0.36%. All CCS loaded. That is pretty good for a valve! I don't have a good oscillator or test bench so it's just a reference....
You managed to get a great audio analyser, congrats! Cheers Ale
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"A mistake is always forgivable, rarely excusable and always unacceptable. " (Robert Fripp) http://www.bartola.co.uk/valves/ |
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31st October 2011, 11:02 PM
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#3 |
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diyAudio Member
Join Date: Sep 2011
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For high supply voltage the distortion is low because the tube works in good linearity. But for low voltage distortions is pretty high even with only 1Vp-p
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1st November 2011, 08:16 AM
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#4 |
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diyAudio Member
Join Date: Aug 2004
Location: Belgium
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1st November 2011, 08:30 AM
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#5 |
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diyAudio Member
Join Date: Sep 2011
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Nice design, the heater power circuit is interesting.
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1st November 2011, 08:46 AM
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#6 |
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diyAudio Member
Join Date: Aug 2004
Location: Belgium
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In fact your design is his first iteration
http://www.headphoneamp.co.kr/bbs/zb...esc=asc&no=247 If you look further down the page you will see links to his other MHAA variations |
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