Mini Circuits still make the SBL-1+. Anzac were taken over many moons
ago by M/Acom, who in turn were taken over by Tyco. They did keep the
MD-108 going for a while but it finally vanished some years ago.
I bought a couple of SBLs back in the Early 80s - from Cirkit in fact.
I used one in a new mixer stage I built for a much modified HW-7 - it
did a fantastic job on the microphonics that tcvr was prone to.
The other one is still in its original packing and I'm sure I'll get
around to using it one day ... even if I haven't in the last 25+
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