I am perplexed. (Sorry for cross posting.)

We have been talking about the need for extended baking times, but over 
the last six months or so, I'm noticing less effective remediation in my 
NESCO (American Harvest) FD-60 vs my FD-1010.

Yes, the FD-1010 is a 1,000 W unit and the FD-60 is a 500 W unit, but 
I'm not running near maximum loads (the FD-1010 can go to 30 trays and I 
have only four, and typically four trays for the FD-60 (maximum 12). 
I've noticed this most recently with only three reels in the FD-60.

THE BAKING TEMPERATURE is about 51 °C and stays within a 2-3 °C window 
in both. I noticed no substantial temperature difference between the two.

What happens is it seems that tapes run in the FD-60 exhibit less 
remediation than tapes baked in the FD-1010 for the ssame period of time.

I disassembled the FD-60 thinking that there might be a dust buildup 
blocking the airflow, but that doesn't seem to be the case.

Any thoughts?

The only thing I can come up with is the greater airflow of the FD-1010 
is more effectively remediating the tapes.

I'm probably going to switch to the FD-1010, though I'm tempted to use 
my outdoor/mold dehydrator which is an FD-61 first as I haven't used it 
for quite a while for mold and I don't think it ever got seriously 
contaminated. I think I've used it much less as what we used to think 
was mold is often exudate from the degrading tape.



Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada                             647 479 2800
Track Format - Speed - Equalization - Azimuth - Noise Reduction
Quality tape transfers -- even from hard-to-play tapes.