The newest solid-state device to come down the electronics turnpike offers some interesting circuit possibilities with existing vacuum-tube equipment. Al- though the new Teledyne junction-fet Fetron is not a new device so much as it is a new application of old principles, it offers a simple solid-state plug-in replace- ment for many vacuum tubes. At the present time there are only two types of Fetrons available, a triode, the TS12AT7, and a pentode, the TS6AK5. These Fetrons are designed to replace, respectively, the 12AT7 and 6AK5. Both of these tubes are members of large families of similar types, so the two available Fetrons are usable in many different circuits. The secret to Fetron operation lies in the development of high-voltage junction fets which will operate without breaking down with the high-voltage power sup- plies found in most vacuum-tube equip- ment. Most Fetron circuits are built with two fets in a cascode arrangement to obtain high gain; the basic circuit was described earlier in ham radio. * The Miller-effect capacitance is mini- mized in the Fetron by using an ultra-low-capacitance, high-gain transistor such as the 2N3823 in the input, with a high-voltage fet such as the 2N4881 at thk output. The complete circuit goes into a metal can that has the same pin configuration as the tube it replaces.
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