Parts and assembly of an old thermionic vacuum tube 24A - RF screen-grid tetrode from 1929.

A marvellous device

The radio tube is a marvellous device. Although it appears to be a fragile affair constructed of metal and glass, in reality it is a rugged instrument that makes possible the performing of operations, amazing in conception, with a precision and a certainty that are astounding.

3W Single Ended Class-A Stereo Tube Amplifier

Small Tube Amp for Home

3W Stereo Quality Tube Amplifier. Based on August 1955 UK Mullard 3-3 circuit design using EL84, EF86 and EZ81 vacuum tubes.

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