Where have all the VHF prescalers gone?

A project I am designing worked with the MB501 (SA701 / MC12022 / SP8704),
but it is now obsolete.
I managed to find a few MB506 chips so board was modified to suite. Now the
source has dried up.

I have searched the web, visited 1000s of sites, all without success.

Anyone have any suggestions for a DIL or SIL VHF prescaler chip that will
operate to 146 / 150MHz?

Perhaps I can use a n SMD (1.27mm pins) on a little PCB that plugs into the
MB506 socket? Any ideas?

The project is for education, so I don't want to stuff the complete synth in
a single chip. The object is that all stages of the synth are accessible
with a scope, or SA, for demonstration.

BR Harry Lythall (alias Lippitz)

+46 73 629 5002

(Quite warm = hot. Post = mail. Make changes as necessary.)