I recently bought this instrument on Ebay - it's quite an old design and if you fancy one the 3325B might be a better bet since it has a much more modern processor and a few extra functions (but will cost more).
It was first released in 1979, at $3000 (roughly $13k at today's prices). Like most HP instruments of that era it has full HPIB remote control.
I'm not going to describe it in detail because that is done so much better than I could in Giovanni Beccattini's beautiful (and free) book "The Great Hewlett Packard" , download (2GB) at www.k100.biz
My 3325A was advertised (and marked on the back) as fitted with option 2 (the high voltage output amplifier) but had been modified at some time and fitted with the High Stability Oscillator instead - so I'll be building a high voltage output amplifier of my own some time.
The fancy oscillator works OK - I'm not sure exactly when my 3325A was built or last calibrated - but with the output set to 10MHz the frequency is within 12ppb (ref a Racal counter using a GPS disciplined clock (Leo Bodinar miniGPS))
I haven't found anything that doesn't work yet but at £200 I expect most people would prefer something smaller and with the greater flexibility of a DDS generator. But you won't get a service manual with a modern instrument !
(apologies for the croc to BNC bodge, I need a long lead to reach the counter !)
MK
