06-10-2021, 12:37 PM
That seller also has ЭМ-7 and ЭМ-8, but they may be just miniature triodes? 18mA @ 1V
Also has a nice selection of real barretters (Series current regulators using iron filaments in a hydrogen atmosphere). A regular thermistor may be needed in series to limit inrush current.
There is also a UHF acorn valve, 6D4J 6D4ZH 6Д4Ж. However it's just a diode. https://www.radiomuseum.org/tubes/tube_6d4j.html
They were invented in the 1930s but very difficult to make so the B7G base replaced the package. https://www.ebay.com/itm/323390878978
Also has a nice selection of real barretters (Series current regulators using iron filaments in a hydrogen atmosphere). A regular thermistor may be needed in series to limit inrush current.
There is also a UHF acorn valve, 6D4J 6D4ZH 6Д4Ж. However it's just a diode. https://www.radiomuseum.org/tubes/tube_6d4j.html
They were invented in the 1930s but very difficult to make so the B7G base replaced the package. https://www.ebay.com/itm/323390878978
