[Test-Equipment] Interest in Replacement Amps for HP8640B?

[Larry Phipps]

I don't know what you're planning on using, but the Gali-84 or GVA-84 
from Mini-Circuits is flat as a pancake from DC-1 GHz, has an  output of 
 > +20 dBm, requires only three parts (two blocking caps and a 
resistor), has >25 dB input and output RL and is unconditionally stable 
and easy to use. I have used the Gali series MMICs on a number of 
projects and they are great (and cheap... around $2). They are 50 ohm 
devices, so I don't know if that works on the input side with the 
HP8640B... but the input would probably need to be padded anyway (25 dB 
gain), so a matching pad would be OK.

Larry N8LP



Steve Harrison wrote:
> Is there any interest among this group for replacement driver or final
> amplifier modules for the venerable HP8640B? If so, what price range for
> either module might you be willing to pay? Would you accept compromises on
> the performance relative to the original HP amplifiers, such as reduced low
> frequency output power (say, +10 dBm instead of +18+ dBm up to, say, 10
> MHz); or reduced output power across the whole frequency range; for
> example, +14 to +16 dBm instead of the original +18+ dBm?
>
> The modules I'm thinking of would be plug-in, bolt-in replacement PC
> boards, perhaps with a top cover to keep the original wire screen shield
> from shorting the new board. You would unbolt your original amplifier
> modules and plug these boards in their place. At this time, no other
> changes are anticipated to have to be made to the instrument, such as to
> accomodate the original +44.6 volt amplifier power supply (i.e.: the new
> replacement amps will operate from the original power supply).
>
> Thanks,
> Steve, K0XP
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