Speaking of tubes, I remember building several kit radios in high school: Filmore compact 5 tube AM superheterodyne table radio, Graymark 3 tube AM broadcast and 80 meter to 15 meter short wave regenerative radio used 5 different hand wired plug in octal socket coils to change bands and long wire antenna. Still remember the tubes, the 3 were 35W4 rectifier in the power supply circuit, 12AU7 medium mu twin triode preamp, 50C5 pentode final amp to output transformer and 4" speaker. Building and getting them to work was a lot of fun. Last was a 5 tube Graymark superheterodyne AM and short wave receiver. Also helped my father assemble a kit tube tester for the high school shop, he was the electric shop teacher. All point-to-point hand wired, there was oodles of wires in puppy.
I'd hate to think what airport homeland security would think these days if my carry bag had a home made 2 transistor radio in a home made case in my carry bag.
Last edited by GallopingGhostler; 09-28-2016 at 08:29 PM.