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Old 21st October 2010, 08:35 PM   #1
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Default Audio measurements on tube amp. ? look here

Here my solution for audio measurements on vaccum tube amplifiers.

EMU input
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Old 22nd October 2010, 10:46 AM   #2
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Great job, Andrea!

And many thanks for info about E-MU card.
As alternative can use less expensive M-Audio Fast Track Pro card...
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Last edited by levelfive; 22nd October 2010 at 11:07 AM.
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Old 22nd October 2010, 12:02 PM   #3
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Can you extend the y axis below -80dB? I'd like to see the complete noise spectrum down to around -140dB.
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Old 22nd October 2010, 12:21 PM   #4
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Hi Andrea

great write-up as usual. The e-mu is a cut above. I did a similar thing a while ago but a more budget approach and consequently not as precise...but may be useful for those with less cash.

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Old 22nd October 2010, 04:18 PM   #5
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Quote:
Originally Posted by vitalstates View Post

I did a similar thing a while ago but a more budget approach and consequently not as precise...but may be useful for those with less cash.

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Hi, vitalstates!

Your solution is quit precice, 16bit converter is too enough for THD measurements in 70dB range.

Thanks for your article.
Regards, Konstantin.
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Old 22nd October 2010, 07:08 PM   #6
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Now I have published some more informations about this project.

The my idea was to test the amplifier in a more large frequency range, until 100KHz.

I use the EMU 0404 USB with Lundahl output transformers to ear hi-resolution audio tracks and I consider it like my best source now.
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Old 22nd October 2010, 07:08 PM   #7
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I have found this:

24Bit96kHz.org - High Quality Music

legal ?
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Old 22nd October 2010, 07:10 PM   #8
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Quote:
Originally Posted by luvdunhill View Post
Can you extend the y axis below -80dB? I'd like to see the complete noise spectrum down to around -140dB.
why ? to see the noise ?
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Old 23rd October 2010, 03:29 AM   #9
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Quote:
Originally Posted by audiodesign View Post
Here my solution for audio measurements on vaccum tube amplifiers.

EMU input
Hello,
As always, nice job.
I have a question or request.
Please tell us more about the setup of the EMU mixer software. Are there different settings for 44.1K 48K 96K and 192 K and 16 bit or 24 bit in the mixer software?
I have an EMU 1212, sorting out the mixer software looks to be a long rainy day project.
DT
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Old 23rd October 2010, 07:32 AM   #10
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Quote:
Originally Posted by DualTriode View Post
Hello,
As always, nice job.
I have a question or request.
Please tell us more about the setup of the EMU mixer software. Are there different settings for 44.1K 48K 96K and 192 K and 16 bit or 24 bit in the mixer software?
I have an EMU 1212, sorting out the mixer software looks to be a long rainy day project.
DT
On the EMU0404 USB control panel is possible set only the sample rate and it must be set to 192KHz to have the larger frequency response band.
In my webpage there is an image about the EMU0404 USB control panel.
No mixer software is available with EMU0404 USB.

Could you send me an image of your mixer ?
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