In this video I quickly cover the electron tubes basics and show a little tube amp project, that uses the 1T4 (DF91). The 1T4 is a low voltage tube that can be operated from 45 (it actually works with 12V too) up to 90 VDC and a heater with only 1,5 V. It is also very cheap and can be as NOS for about 0,5 to 1€.
To make more bang I just put two tubes in parallel. In my configuration the whole set-up makes about 150 mW of sound power.
Hi, I just started a dream project: Building an oscilloscope from scratch. Originally I wanted to use a russian 13LO37I but it turend out to be too bulky so I went and scored a waaay smaller 3KP1 / DG 7-113 from ebay.
I’ll put up a high res Photo of the tubes weiring system at my website.
This is ust a very short overview about my old 400 MHz/64 Mb RAM Laptop computer, that I turned into a serial terminal after usb stopped working and the body-case broke open. Unfortunately I couldn’t find the original layout for the board anymore but it followed the usual max232 schematics anyway.