When I was a young pup, I took an electronics course that culminated in the construction of a three tube amplifier. I think it had what was called a line voltage supply (no transformer) with potentially a hot chassis. Two of the tubes were 35w4 half-wave rectifier and the output was a 50c5. The the preamp was maybe a 12au7. The filaments were series wired off the line voltage. There must have been an output transformer but I don’t recall. I cut and bent the chassis on a metal brake and punched the socket holes. Using components from the tool crib and a schematic, I wired it together. I was hooked! I ended up making a nifty little intercom with it but it is very long gone.
I understand that this was a common basic project back in the day. Nostalgia has me wondering if anyone has any information on this little amplifier?
I understand that this was a common basic project back in the day. Nostalgia has me wondering if anyone has any information on this little amplifier?
There were lots of similar circuits, mostly in radios. An example:
https://www.angelfire.com/electronic/funwithtubes/AA5-5.html
https://en.wikipedia.org/wiki/All_American_Five
https://www.angelfire.com/electronic/funwithtubes/AA5-5.html
https://en.wikipedia.org/wiki/All_American_Five