Thanks. This is a useful data point. I knew I was hearing something going wrong. I would describe it
as a fuzzing out of the upper midrange area, but maybe everything is being fuzzed up and my hearing
happens to pick up the upper midrange first.
-- Tom Fine
----- Original Message -----
From: "Goran Finnberg [log in to unmask]" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, December 18, 2015 2:58 PM
Subject: [ARSCLIST] Audio detoriation caused by baking was Interesting sticky-shed data point
>My overall point is, I think there are still a lot of assumptions made about sticky-shed, which
>aren't proven and may not be true. The only thing that does seem to be true is that a sticky tape
>can be baked and it will playback in a mechanically successful manner.
>As I've said, my experience is that the audio deteriorates after a
>handful of bakes, but others disagree and I think we all
>admit we haven't done rigorous science on that.
I have done some testing, yes.
What happens after each baking cycle is that the AM distortion increases.
I use the Altair T2DSTape / Transport diagnostic system as designed by Dale Manquen to verify this.
This box can measure both scrape flutter wideband to 5 kHz, FM, and AM components too.
Also the increase of the AM distortion can be easily seen on the 12.5 kHz tone on the oscilloscope
directly where the AM increase on each heating/baking pass becomes more and more unstable making the
picture become very fuzzy indeed due to the AM modulation.
So no surprises here.
The Mastering Room AB
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