[time-nuts] Anyone heard of a Rubidium Standard called a Varian X-4700A?

2013-08-13 Thread cdelect
Jerry, The 4700A was one of the very first Rubidium standards made. The V-4700A came first and had the distinction of having a lamp discharge oscillator that used two submini vacuum tubes in a flip plop configuration! It was rated at 10,000 hours. The X-4700A had the more familiar transistor dis

Re: [time-nuts] Anyone heard of a Rubidium Standard called a Varian X-4700A?

2013-08-12 Thread paul swed
Jerry would love to see some pictures. Quite likely it will work. Way back when they used to put a fair amount of RB in so pretty good chances. Sure you could have various issues like how they ignite the bulb. But those aren't really that bad to deal with usually. Regards Paul WB8TSL On Mon, Aug

[time-nuts] Anyone heard of a Rubidium Standard called a Varian X-4700A?

2013-08-12 Thread gchafee
Hi all, A number of years ago when I lived in Denver, I knew George Kamas of whom worked in the (then NBS) Time and frequency Labs. He was able to purchase a lot of the equipment that they disposed of and I wound up with one piece that I only had running for a short time. It is a Varian X-4700A