I should most likely clarify. It's a mono but dual-mono on half-track. I
have also tested my deck and it is calibrated. The azimuth is correctly
set so it's not off by 1/2 a cycle. I have tested my signal path and it's
ok. The cables match: hot, cold and ground are correctly wired.
The majority of the tapes are fine but it's just a select few dual-mono
half track tapes that are 180 degrees out of phase with left and right
It's really easy to "fix" by inverting the phase on the digital file of
one channel but I'm trying to figure out how a recording got this way. My
current guess is that since this is an amateur recording, someone had
wired their deck incorrectly on one of their cables but I was wondering if
anybody else had any other possible more likely culprits and if this is a
common problem that I've just not seen before.
Broadcast Media Digitization Librarian
University of Maryland
B0221D McKeldin Library
College Park, MD 20742
On 2/6/13 10:23 AM, "Shai Drori" <[log in to unmask]> wrote:
>I can think of a few answers. It could be a reversed canon connector
>somewhere from the console to the tape deck. If a head was replaced, the
>wires could have been soldered backwards on one of the channels. I am
>assuming your setup hasn't changed and you are sure your chain is in
>phase. Is it possible that you pressed a reverse phase switch somewhere
>Luckily the fix is easy, just flip one of the channels. The audiophooles
>would probably tell you to make sure you are flipping the correct
>channel or else you will end up with to channels flipped and that will
>totally destroy the soundstage and breath in your recordings (actually
>had one say this to me during a session).
>?????? 06/02/13 4:55 PM, ????? Henry Borchers:
>> Hi all,
>> I've got a question for you that has been a real head scratcher for me
>>and I hope there is someone here who might be able to shed some light on
>> I've been digitizing a number of amateur recordings from a student
>>radio station from the 1970s recorded on 1/4" reel tape and a number of
>>these recordings from this collection seems to be mono and have no
>>stereo field but the left and right channels have opposing polarity. It
>>is easy to just digitize both channels and play them on stereo
>>headphones but since they are 180 degrees out of phase, they cancel each
>>other out when summed together with a mono speaker.
>> I understand the physics of canceling waves (and I know how deal with
>>this) but my question is this. Does anybody know how an amateur
>>reel-to-reel recording could have gotten this way?
>> Henry Borchers
>> Broadcast Media Digitization Librarian
>> University of Maryland
>> B0221D McKeldin Library
>> College Park, MD 20742
>> (301) 405-0725
>????? ?????? ????? ?? ????? ????? ?????? 8-35 ??.