"Sounds to me like he's perfectly willing to let us suggest certain lines of endeavor; he may decide that they look good enough to have the Terran Electric labs try themselves," said Channing. Wes Farrell looked uncomfortable. "I have half a notion to toss him out," Channing told Farrell. "I also have half a notion to make miniatures of this tube and go ahead and work regardless of Kingman or Terran Electric. O.K., Wes, we won't do anything illegal. We'll begin by making our list." "What is your intention?" asked Wes. "We hope that these tubes will enable us to detect driver radiation, which will ultimately permit us to open ship-to-ship two-way communication." "May I ask how you hope to do this?" "Sure. We're going to cut and try. No one knows a thing about the level of driver-energy; we've selected a name for it: Subelectronics. The driver tube is akin to this transmission tube, if what I've been able to collect on the subject is authentic. By using the transmission tube--" "Your belief is interesting. I've failed to see any connection between our tube and the driver tube." "Oh, sure," said Channing expansively. "I'll admit that the similarity is of the same order as the similarity between an incandescent lamp and a ten dynode electron-multiplier such as we use in our final beam stages. But recall this business of the cathode-dynode. In both, the emitting surface is bombarded by electrons from electron guns. They both require changing." "I know that, but the driver cathode disintegrates at a rate of loss that is terrific compared to the loss of emitting surface in the transmission tube." "The driver cathode is worth about two hundred G-hours. But remember, there is no input to the driver such as you have in the transmission tube. The power from the driver comes from the disintegration of the cathode surface--there isn't a ten-thousandth of an inch of plating on the inside of the tube to show where it went. But the transmission tube has an input and the tube itself merely transduces this power to some level of radiation for transmission. It is re-transduced again for use. But the thing is this: your tube is the only thing that we know of that will accept sub-electronic energy and use it. If the driver and the transmission tubes are similar in operational spectrum, we may be able to detect driver radiation by some modification." "That sounds interesting," said Wes. "I'll be darned glad to give you a lift." "Isn't that beyond your job?" asked Channing. "Yeah," drawled Farrell, "but could you stand by and watch me work on a beam transmitter?" "No--" "Then don't expect me to watch without getting my fingers dirty," said Farrell cheerfully. "Sitting around in a place like this would drive me nuts without something to do." "O.K., then," smiled Don. "We'll start off by building about a dozen miniatures. We'll make 'em about six inches long--we're not going to handle much power, you know. That's first."