This item is an old-school crystal oven, apparently manufactured in 1962 for the Federal Aviation Administration by Bliley. Part # TCO-11C is approximately 1.9" wide, 1.45" deep and 4" tall, and fits in an octal tube socket. We have several frequencies, with 1 or 2 units of each frequency. The frequencies (in Mhz) are: 9.033333, 9.083333, 9.100000, 9.116666, 9.150000, 9.166666, 9.216666, 9.341666, 9.358333, 9.375000, 9.383333, 9.466666, 9.475000, 9.533333, 9.541666, 9.550000, 9.608333, 9.658333, 9.758333, and 9.791666. If the frequency is important to you, just indicate your preference in the comments section at checkout. These items are unused, and most are in their original packaging.
