Hello Andy,
Don't think we have any TR-600A manuals here, but I'll have a look.
We're into working TR70B and also have a lot of Ampex machines waiting their turn!
There's a lot of brand new TR70B spares to hand too.
It does indeed look like a very clean machine - so much ex-broadcast kit is so filthy!
I'll have a look through the RCA documentation.
Best regards,
Paul Marshall
Chairman
Broadcast Engineering Conservation Group
www.becg.tv