Posted in the Pearl 3 thread but got no response. Bob Graham has a simple Azimuth adjustment tool, that in a nut shell ties l/r plus, 1 channel inverted phase. Then using a monaural recording with limited high frequency response you can adjust Azimuth to get the least amount of music coming through. The question centers around how to make one, the 1 that I have in the store worked a while ago but more recently when I went to use it I got a lot of hum.
I would like to make a working version and anyone getting seriously into vinyl might want to as well. So if someone can give a quick explanation on the correct way to do this it would be appreciated.
I would like to make a working version and anyone getting seriously into vinyl might want to as well. So if someone can give a quick explanation on the correct way to do this it would be appreciated.
Rang a few bells, you might like to take a look at this: https://www.beis.de/Elektronik/MPX-AZIO/MPX-AZIO-en.html
I think I prefer the crosstalk method. But you need an oscilloscope.
This method is pretty good and repeatable.
https://www.analogplanet.com/conten...ering-if-youre-using-oscilloscope-set-azimuth
This method is pretty good and repeatable.
https://www.analogplanet.com/conten...ering-if-youre-using-oscilloscope-set-azimuth
I think you can use a center tapped audio transformer, L and R at each end, they should cancel if azimuth is correct. It can go after the phono preamplifier, the output could be observed by an oscilloscope or listened to as a monaural signal.
Okay, I opened up the Graham AZ-1, it takes the L/R plus inputs and ties 1 to an RCA + and the other to the same RCA -. This then connects to an amplifier and by using a monaural LP you should be able to null the output by adjusting Azimuth.
I'm going to have to try it again to see if the time that I got hum perhaps was something else causing it.
I any case, this is simple and easy to make and a pretty good method, assuming 1 doesn't have scopes etc.
I'm going to have to try it again to see if the time that I got hum perhaps was something else causing it.
I any case, this is simple and easy to make and a pretty good method, assuming 1 doesn't have scopes etc.
Here is another method for checking azimuth and why sum to inversed mono may not be best method.
https://www.sound-smith.com/faq/how-do-i-set-azimuth-adjustment-my-cartridge
https://www.sound-smith.com/faq/how-do-i-set-azimuth-adjustment-my-cartridge
The thing that struck me about the work that Uwe Beis did is that there's so much variation. Playing the same track again or just lifting and replacing the record gives different results.
I'm not skilled enough to know how much of this was his approach/hardware or inherent in measuring crosstalk but it makes me wonder just how much point there is in spending hours in trying to set it precisely...
