The description sounds the same as the crystal oven in a 5245L counter.
Part number for one I have is 5243A-69A. I suspect the operation may be
the same if you can find docs for the 5245 counter. The crystal is 1 MHz
and the oscillator circuit was external to the oven unit connected
through the 4 feed throughs. There is a thermistor bridge in the oven
and a heater resistor connected through the ribbon cable.
On 12/26/2011 12:19 PM, ed breya wrote:
While looking for something in my OCXO department I ran across this
old piece from the 1960s. I had saved it from an HP5110 synthesizer
carcass years ago, but only the crystal oven unit remained - no
oscillator or control circuits.
Just thought I'd ask here if anyone has info or a source of a 5110
manual that may have enough info to see what the rest of the circuitry
was, and if it's worth fixing or reusing. The part is HP 05110-6043. I
don't recall ever seeing anything about this oldie anywhere.
It's a cylindrical type, about 2.25" OD, and 5" long, with four teflon
feedthroughs on the side for the crystal circuit connections. Also out
the side runs a light gauge ribbon cable with six lines black, green,
orange, blue, gray, and red, presumably for the heater circuitry. On
the side near the far end is a small plug cap, presumably covering a
temperature adjustment pot or thermostat. The crystal itself is huge,
mounted inside a vacuum tube envelope. Judging by the size of the
crystal and the big mica caps with it, I'd guess it's 1 MHz.
Ed
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