Hi Paul,

Vague memory but afair it is a UHF (lower UHF) power transistor, maybe
20 watts or so, 24V or 28V (not a 12V type). Could be ok for the 70cm
ham band but that might already be a stretch, probably better for 2m.

Amps with devices like these didn't have a whole lot of gain when used
at their upper frequency limits, certainly less than 10dB so you'd need
something of about a quarter of the power you want as output to drive it.

Again, this is from memory so I am not 100% sure. My hunch is that you
probably can buy 12V versions in a similar power range for little money
these days.

Regards, Joerg

http://www.analogconsultants.com