vacuum tube

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    Type 807 Tube RF amplifier with transistor a pre amp

    Hi all, I have a 807 vacuum tube and I want to make a CW RF amplifier with it. I am thinking of using transistors in pre amplifier and 807 as final power amp. I have only one tube so I cannot make push pull amp. First of all I need to know if it will be possible to make such RF amplifier. If...
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    Identification of components in old radio

    Hi. I have recently gotten my hands on what I think is a very old radio: I am interested in how this device works. Inside the case is, among other things, a black cylinder containing some circuitry and on its side is a schematic: I have tried making a hand drawn copy: I am having a hard time...