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Can you tell original file from tube amp record? - test
Can you tell original file from tube amp record? - test
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View Poll Results: Which file is the original and which do you prefer
Apricot is the original file 7 46.67%
Avocado is the original file 5 33.33%
I prefer Apricot by listening 7 46.67%
I prefer Avocado by listening 7 46.67%
Multiple Choice Poll. Voters: 15. You may not vote on this poll

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Old 20th November 2018, 11:36 AM   #1
PMA is offline PMA  Europe
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Default Can you tell original file from tube amp record? - test

I have a new test, and now it is an original file vs. the file that was recorded through hybrid tube-SS amplifier. So,

one of the files is an original, original rip
the other file was recorded, playing the original file, through the chain: D/A – hybrid tube SS power amplifier loaded with real speakers – A/D

The levels of the two files was not digitally manipulated, the levels were only equalized by the analog potentiometer.

Please listen to the files and tell me which one is the original file and also which one you prefer sonically. It would be nice if you also could add a foobar ABX protocol, but it is not a necessary condition, I am not forcing you to do it, just asking if possible.

The link to the test files is
Dropbox - tubepower.zip

0dBFS in the recorded file is about 6Vrms and the maximum sample amplitude is about -0.3dB, just FYI what was the recording level.

The hybrid tube-SS amplifier has its own thread
Class A hybrid tube-SS openloop power amplifier

The poll expires on December 4

------------------------------------------------------------------

Amp schematics has been now linked. Output impedance is 0.23 ohm, so damping factor is 17x for 4ohm and 34x for 8ohm load.

http://pmacura.cz/HYBRID_PMA.pdf
----------------------------------------------------------------------
Disclosure:
Apricot is the file that was recorded through the open-loop hybrid tube-SS power amplifier, with transistor class A unity gain output stage.

Avocado is the original CD rip.


=================

December 15, new test files
Dropbox - fasteners.zip
(Beethoven violin concerto)

Last edited by PMA; 15th December 2018 at 04:46 PM.
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Old 20th November 2018, 12:27 PM   #2
TNT is offline TNT  Sweden
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Using ABX23 / Lacinato 2.37 on Mac and I could quite fast identify a preference while playing the version sighted. I prefer Apricot and I think that Avocade is the "tobes"

My very quick run ended like:

Completed trials: 15
Number correct: 8 (53.333336%)
Confidence that your results are better than chance: 0.5

Last played: A

Individual test results [choice/actual] from among 2 possible files:
Test #1 [ A / B ]
Test #2 [ A / B ]
Test #3 [ A / A ]
Test #4 [ B / A ]
Test #5 [ A / A ]
Test #6 [ A / B ]
Test #7 [ A / B ]
Test #8 [ A / B ]
Test #9 [ B / A ]
Test #10 [ B / B ]
Test #11 [ B / B ]
Test #12 [ A / A ]
Test #13 [ B / B ]
Test #14 [ B / B ]
Test #15 [ A / A ]

But I felt I got the hang of it better at the end and this seem to have been the case.

I belive in ABX. I think it will serve a result that could guide me. The difference between the files where not in my opinion great and I could live with both SQ in some sense but still, I didn't care for the soft/muddy base in Avocado.

//
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Old 20th November 2018, 12:43 PM   #3
PMA is offline PMA  Europe
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Thank you for your listening impressions and the ABX result, TNT! I appreciate it very much.
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Old 20th November 2018, 01:37 PM   #4
eldad is offline eldad
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a short listening on foobar with the notorious ns-10 no abx i guess Avocado is the original file.
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Old 20th November 2018, 02:17 PM   #5
PMA is offline PMA  Europe
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Thank you for listening!
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Old 20th November 2018, 02:21 PM   #6
TNT is offline TNT  Sweden
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Damn bass/base - hate doing that error

//
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Old 20th November 2018, 02:33 PM   #7
PMA is offline PMA  Europe
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Quote:
Originally Posted by TNT View Post
bass/base

//
No problem, I understood. We are a mix of many nations and languages .
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Old 20th November 2018, 06:39 PM   #8
gpapag is online now gpapag  Greece
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Can you tell original file from tube amp record? - test
I prefer the bass on the avocado file, I hear it more tight and strong.
Nothing else to comment.
I made the comparison 5-6 times, through headphones

George
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Old 20th November 2018, 09:31 PM   #9
PMA is offline PMA  Europe
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Thank you George.
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Old 20th November 2018, 10:21 PM   #10
gpapag is online now gpapag  Greece
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Can you tell original file from tube amp record? - test
Thanks for getting into the trouble to record the files and upload them!

George
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