Distortion measurements on Meng 6P1 - diyAudio
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Old 26th December 2009, 01:41 PM   #1
tvrgeek is offline tvrgeek  United States
diyAudio Member
Join Date: Dec 2009
Location: Md
Default Distortion measurements on Meng 6P1

Thought I't throw up some numbers, before and after replacing the 6N2's with 6AX7's. Note that by adjusting the symmetry, I already cut the second order in half.

6AX7, 1Khz, 2.7V out. 6N2
Right Left Right Left
Second .081 .181% .504 .256
Third .418 1.105 1.242 1.143
Fourth .029 .008 .085 .023
Fifth .017 .218 .282 .225

Noise floor with the 6AX7's was about 5 dB lower and gain about 1 dB higher.
Lots to understand, like why the size of difference right vs left. I have not swapped anything R for L to see if it is tube or passive components.

Considering I started with over 2% second on both sides, not too bad. That third is a problem! I am a bit confused as the symmetry effected only the second, where the ligature I read said it should effect the third.
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Old 26th December 2009, 01:42 PM   #2
tvrgeek is offline tvrgeek  United States
diyAudio Member
Join Date: Dec 2009
Location: Md
Messed up the formatting! took out my spaces.
Anyway, 4 columns 6AX7 R & L, 6N2 R & L
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