Hello Time-Nuts, One of my long-running experiments needs a new home. RUFUS (RUbidium Frequency Ultra Stable) has lived under the basement stairs for almost six years now, however, we are undertaking a major home remodel (including moving the basement stairs) and he has been shutdown. After the remodel the stair location will be unavailable, so I'm thinking that if there is another time-nut that wants to play with electronics in a vacuum chamber this would be the ideal opportunity to pass it on. As RUFUS stands today there is a 23" OD by 17" high (24" with fixtures) vacuum chamber that contains a Datum LPRO-1010 Rb frequency source. The chamber has LOTS of ports that have been sealed off (it was originally a cryogenic test chamber for an aerospace company) as well as shortened (the cryogenic section has been removed). The LPRO is mounted to the top cover. There are six 61-pin electrical feed-thru connectors on the top. Kapton heater patches have been added to the side of the chamber for temperature control. There is also a mechanical vacuum gauge that measures 0-100mm Hg. The chamber sits in an insulated box on top of a 33" high rolling equipment rack with 12U of rack space front and back. The back has power strip, constant voltage transformer (pretty noisy), and a modified Trimble Thunderbolt that uses the LPRO instead of the original 10MHz oscillator. The front of the rack has a panel with a temperature controller that drives the heaters around the vacuum chamber. There is another panel with a modified Acopian Gold Box power supply that has a 10-turn pot to adjust from 18-30 volts (the LPRO input spec, nominal is 24v) and a 4-1/2 digit meter to monitor supply voltage, supply current, EFC voltage, lamp voltage, and VCO voltage. I also have a Chinese two-stage vacuum pump to pump the chamber down. I have found that by adjusting pressure and/or voltage very low aging rates can be achieved. My first choice would be to pass it on to someone that wants to play with it in close to its current configuration. My second choice would be to part it out. Pick up would be in Denver, CO and I am very flexible on time frame. I'm not looking to get rich, but the TB, vacuum chamber, and pump have some nominal value. Sorry for the extremely long post. I have attached two pictures as teasers. I have more upon request, just email me. If you want to know more I would be happy to give you a call, just email me your phone number. Thanks, Skip Withrow