Hi Shai,

I would consider baking the blue reel tapes. Although I save baking as a 
last resort, layer-to-layer adhesion usually requires careful baking. 
You may want to lubricate the red & green reels if you have any kind of 
oxide issues at all, including having to clean the transport more than 
usual.

Although you are a professional & plenty qualified, you may find some 
useful information in two articles that I wrote:

http://www.baileyzone.net/BAKING%20ANALOG%20AND%20DIGITAL%20AUDIO%20TAPE.htm

http://www.baileyzone.net/LUBRICATING%20POLYESTER%20AUDIO%20TAPE.htm

Be safe,

~CB

Corey Bailey Audio Engineering
www.baileyzone.net

On 11/2/2020 4:17 AM, Shai Drori wrote:
> Hoping to find some answers from the group about a problem I am facing. I'm
> digitizing a few hundred Nagra SN tapes. These are reel to reel tapes in
> the width of a cassette. There are three lengths, red, green, and blue
> reels, with blue being the thinnest and longest tape
>
> the red and green tapes play fine but the blue tapes are stuck so each
> layer is glued to the layer before it. When I try to play the tapes they
> squeal and the magnetic particles sometimes are removed from the base and
> stay stuck to the back of the layer before. These tapes are not
> black-coated and resemble really thin c-120 cassette material.
>
> Any suggestions are welcome.
>
> Cheers
> Shai Drori
> Expert digitization services for Audio Video
> 3K scanning for film 8mm-35mm
> Timeless Recordings Music Label
> www.audiovideofilm.com
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