I have a 7704A mainframe that is in need of repair...
Also I am in need of a horizontal sweep module.
For mostly audio frequencies a 7B53(A) would be the right choice for
the time base plug in.
The 7B53/7B53A is not recommended for use in the 7704/7704A. I don't
remember why, but I think it was a good reason. The original poster needs
to find a 7B70+7B71, 7B80+7B85, or 7B92/7B92A.
