What to do when a friend gifts you a bunch of outdated vacuum tubes? Apparently, it is possible to build a very nice low voltage tube preamp.
Car Valves is a project based on old outdated vacuum tubes. It is built around the ECH 83 which was originally designed to be used in old car radios. It has one amplifying stage [triode] and a stage that seems to be used within the radio receiving circuit [heptode]. In its original function, it has been powered by 12V car batteries. Compared to conventional high-voltage tubes, this property makes it an ideal and harmless object for experimentation. Join Ludwig Klöckner and build yours.
Features:
- High Impedance Audio-Input
- Symmetrical and Line-Output
- Controls: Gain, Bass, Treble, Volume
- On-/Off Switch