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.
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.