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P3 Adjustment for the average Hobbyist
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Old 11th July 2018, 04:49 PM   #1
Russellc is online now Russellc  United States
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P3 Adjustment for the average Hobbyist
Default P3 Adjustment for the average Hobbyist

After some very recent conversation on the "BA3 as Preamp" thread, several have obtained the 212 interface to use with ARTA or other program is setting of P3.

Some are as lost as I am, others not quite so much. In an effort to enable the average guy to set P3 to one's benefit, (or at least make both channels symmetrical) this thread was created.

Most of those envolved with the discussion either have, or are getting this device:

Focusrite Scarlett 2i2 | Sweetwater

Also, a Tascam unit is listed that would also be appropriate. Some have done this and are going to show how they hooked it up, the rest are flying by the seat of the pants.

This discussion began on the "BA3 as Preamp" thread, post numbers #1298-1313.

Please feel free to join comment inform etc.

Russellc
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Last edited by Russellc; 11th July 2018 at 06:11 PM.
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Old 11th July 2018, 05:38 PM   #2
silasmellor is offline silasmellor  Denmark
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P3 Adjustment for the average Hobbyist
Nice one Russell. I will take some photos when i get to measuring. I should add that just about any home recording interface is usable. I use an mbox3.

I am not sure what voltage input these interfaces tolerate, so it is probably good practice to implement some kind of voltage divider to protect the inputs.
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Old 11th July 2018, 06:15 PM   #3
Russellc is online now Russellc  United States
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P3 Adjustment for the average Hobbyist
Quote:
Originally Posted by silasmellor View Post
Nice one Russell. I will take some photos when i get to measuring. I should add that just about any home recording interface is usable. I use an mbox3.

I am not sure what voltage input these interfaces tolerate, so it is probably good practice to implement some kind of voltage divider to protect the inputs.
Would be happy to see any and all interfaces, looks like they perform similar job. Me, once I get the device I have no idea other than basic idea, of how to hook it up! Glad to have help from one who is actually experiencing setting of P3 in a meaningful way. Thank you for your input, much appreciated.

Russellc
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Old 11th July 2018, 06:31 PM   #4
Russellc is online now Russellc  United States
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P3 Adjustment for the average Hobbyist
I don't know if this is of any use here, but it came up in a search. He is using the ARTA soft ware and it shows the fundamental, 2nd harmonic, 3rd harmonic and so forth.

YouTube

Here is page for ARTA download

ARTA Software

And of course, the video by 6l6:

YouTube


Russellc
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Last edited by Russellc; 11th July 2018 at 06:34 PM.
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Old 11th July 2018, 06:33 PM   #5
vdi_nenna is offline vdi_nenna  United States
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Quote:
After some very recent conversation on the "BA3 as Preamp" thread, several have obtained the 212 interface to use with ARTA or other program is setting of P3.
Are trying to build an interface so you can see harmonic distortion on a PC?
Preamp only?

This has been done. You just need a card capable of 24-bit 192khz. There is also a simple interface for power amp measurement. I have the links at home and can post later.

If this is something else or better, then I'd like to know more.
I need to adjust a 085 JFET F6 power amp. I have a PC with a studio Juli@ card.

Amazon.com: ESI Juli@ 4-in/4-out PCI Audio Interface with Swappable I/O Socket: Musical Instruments
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Old 11th July 2018, 07:19 PM   #6
Russellc is online now Russellc  United States
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P3 Adjustment for the average Hobbyist
Quote:
Originally Posted by vdi_nenna View Post
Are trying to build an interface so you can see harmonic distortion on a PC?
Preamp only?

This has been done. You just need a card capable of 24-bit 192khz. There is also a simple interface for power amp measurement. I have the links at home and can post later.

If this is something else or better, then I'd like to know more.
I need to adjust a 085 JFET F6 power amp. I have a PC with a studio Juli@ card.

Amazon.com: ESI Juli@ 4-in/4-out PCI Audio Interface with Swappable I/O Socket: Musical Instruments
Thanks for the input. This is exactly why I posted this thread. Would love to have links to anything helpful. Even with the software and whatever device is used as interface, I am at a loss to hook it up and use it! Others who have responded are a little to a lot further up the learning curve.

I just wanted to do something with my units (BA3 Amp and two BA3 preamps) P3 besides leaving them set mid range, which doesn't mean they are symmetrically set, let alone adjusted to "best" distortion flavor.

More advanced uses, such as you suggest are also welcome, its all part of a similar problem. With as many BA3 amps and especially pre amps that have been built here, I cant be the only smuck who's P3 is just setting mid range!

Thanks for your input,

Russellc
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Old 11th July 2018, 07:31 PM   #7
vdi_nenna is offline vdi_nenna  United States
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Ok, I just have one bit of advise to people starting on using "P3".
Monitor the current draw across whatever resistor you used to adjusted the bias. I had a bad experience and it wasn't my own amp. I was helping someone else. It's real bummer.

Maybe not so much on preamps, but power amp's current setting needs to be watched and your P3 changes should be done slowly. I would still watch preamp current adjustment. Can't hurt.

I have 2 spectrum analyzer applications; one is more complicated than the other. The results are basically the same. The more complicated version allows for more adjustment of measurement, results and views.
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Old 11th July 2018, 07:34 PM   #8
vitalstates is offline vitalstates  United Kingdom
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this rang some bells in my head when I read it.

I'm not sure whether this is relevent or of any use but sometime back(was it really that long ago!) I put together this guide:

http://www.vitalstates.org/diy/ampli...easurement.pdf

you can substitute arta for the software mentioned in the doc, indeed there is an example of using ARTA on my write up for the sv572 amp. With ARTA you don't even have to do the thd calculation, it's displayed on the window.
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Old 11th July 2018, 08:43 PM   #9
Dennis Hui is offline Dennis Hui  Canada
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P3 Adjustment for the average Hobbyist
Hi Vince,

Thanks for the reminder to monitor current when adjusting P3.

Dennis
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Old 12th July 2018, 04:32 AM   #10
Dudeisms is offline Dudeisms  United States
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Could this be used? it’s quite inexpensive

Amazon.com: BEHRINGER U-PHORIA UMC202HD: Musical Instruments
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