No but thanks for the reply.
I mean that goo coating the bands inside the unit to help them grip and transfer motion.
You tend to find it in the old valve units.
Or, on the brake bands?
I've seen that once or twice - in the recorders I looked at it was the adhesive that was used to glue the friction material that had bled through it. The fix was to replace the friction material and use a glue that doesm't bleed such as silicon adhesive.
That's not what I mean.
The stuffs completely intentional.
Its a thick black goo (really sticky and a pain to clean out of the carpet)
VERY similar to cheap thermal paste but thicker.
I had an old Phillips unit once.
It ha 2 perfectly spherical "gears".
They where covered in the goo.
When you pressed play the
mechanism pushed them closer
together. They did not make
contact but the goo between did
and as the reel filled up and span
slower, the goo transferred a certain
force meaning that the band would
not have to slip to match the various
speeds and therefor prolong the life
of the band as well as keeping it moist.
The goo is not a biproduct.
It is a significant part of the machine.
The question is:
What is that goo?
So the goo ends up on tape? Messing the contact with the heads? Possible dissolving the tape magnetic layer in time, while being stored?
No, I never saw that... probably it was something experimental in beginning, before they had Teflon coatings.