Roger Basford wrote: > Hi, > > Can anyone point me to info on the above aircraft Tx of 1939 vintage? Re: CBY 47141 A CBY-47xxx would be an RF transformer or choke. A CBY-52xxx would be a transmitter. A CBY-46xxx would be a receiver or receiver mount. Accessories would be CBY-2xxxxx. Do you have any more information from the data plate?