[78-L] question on tape baking

[Robert M. Bratcher Jr.]

At 10:08 PM 9/16/2009, you wrote:
>Actually, you can expect to have problems with virtually all Shamrock tape
>except brown oxide 1.5 mil (smooth back)..most of the black oxide 
>smooth-backed
>tape won't respond to baking but might have to be cold-played (see below). It
>may be the same as Ampex 291, which was sold as for educational use.

I don't think I've ever seen Ampex 291. Was that another reject tape 
sold cheaply?

>Shamrock was known by other names including Emerald (similar green boxes) and
>Brentwood (black boxes, sold by Woolco). And Radio Shack sold a lot of it in
>the early 80s as Concertape.

I have a few reels of Concertape that still play fine to this day. 
It's either brown or black oxide (I don't remember) bought in the 
early 80's. Played one of those reels 2 weeks ago with no sticky shed squeal.

Oh & did you know that cassettes from the 80's squeal on playback? 
I've thrown several sermon tapes away because they started squealing.....