Thanks for  the various comments.

 Another test this morning, this time a cruel one  to test my humble

Capture exactly the same disc side not once but twice. Compare time
accuracy of the two captures. To time align precisely, use as
reference a short identical click on both captures, then flip phase on
one capture to test null ability. Hopeless. Full cancellation only for
less than maybe 100 mS. Oh well, back to the drawing board. It would
be great to get to the point of luxury  where issues like off centre
or buckled discs were the bottleneck.


----- Original Message -----
From: "Association for Recorded Sound Discussion List"
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To:<[log in to unmask]>
Sent:Sun, 20 Dec 2020 16:51:53 -0800
Subject:Re: [ARSCLIST] Noise reduction on mono records using two
separate coherent sources

 I had some experience with the Stephens 2", 40 track. The specs were 
 horrible because you can't cheat Mother Nature. The 2", 32 track 
 introduced by Telefunken wasn't bad, although it was used with Telcom

 noise reduction. A version of 3" audio tape was introduced in the
 for a hot minute, that allowed for more tracks, but I don't think it 
 made it to the production line. John Windt had a mod for a 24tr. that

 worked well. Basically, it was an add-on daughter board that took the

 inner-channel crosstalk, flipped the polarity, & reintroduced it. The

 device didn't get all of the crosstalk & other problems but, it did 
 noticeably improve things. The gain was adjustable so, it took longer
 align the machine.

 My $0.02


 Corey Bailey Audio Engineering

 On 12/20/2020 3:31 PM, Jamie Howarth wrote:
 > The late Roger Nichols talked about a zillion track multitrack head
for mono or stereo whereby the correlated audio could be made distinct
from each track's noise and AM distortion and that probably could
work, but it's not as easy as it looks because the tape isn't
dimensionally that stable, dynamically - local momentary stretching

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