ECH83 Tube Preamp
this Projekt started with a box full of old tubes that i got from a friend. I did some research on the most interesting ones, finding out that it is possible to build a very nice low voltage tube preamp.
The ECH 83 was originally designed to be used in old car radios. It has one amplifing stage [triode] and a stage that seemst to be used to built the radio recieving circuit [heptode].
I did some experimentation on breadboard to build the circuits that are already commonly used with this tube. For me best worked a combination of preamp stage, tone controls and master volume combined with a handy symmetrical output to use it as a preamp for my bass-guitar.