What letter model do you have? TM 11-2524 says the I-151-A is an Espey 101. In a message dated 2011-07-18 17:30:51 PM Central Daylight Time, telegrapher at q.com writes: > Does anyone out there in radio land have one of these Hickok Adio > oscillators? Looking for some data on it. > > Larry > W0OGH Robert Downs - Houston wa5cab dot com (Web Store) MVPA 9480