It's time to bring out those boat anchors and hybrids and join in the fun. The 3938 tube net is held on the last Monday of each month at 8:00 pm Eastern time (3938 Mhz). The next net is scheduled for tomorrow evening, Monday, April 28th. The purpose of the net is to operate vintage transmitters/transceivers on the air, that include three or more tubes in the radio. You must have at least three or more tubes in your transmitter/transceiver to check in (tubes in your linear amplifier do not count). Hope to hear you there.
If this isn't a microwave net (3938 MHz), then I think you missed a decimal point. Either that or you meant 3938 KHz.
Best of luck, and have fun with the net!
73 de N8AUC