[TTech]

Once again appreciate the much needed info. Won't be able to digest all the info quickly due to several other large projects in the queue. Thinking of lowering the grid resistor values. Have many A.M. stations in the area but they are all fairly small output stations, one-K to 5-K outputs. average distance from home, twenty to thirty miles. I'll need all the help I can get. Some drop to 10 watts at night.

Since I read your last reply have found several video's on re-magnetizing the permamagnet. But all leave out the info I'm in need of. Guess it's common knowledge that I slept through during a long ago class. Does {north equal +} and {south equal -}.
This speaker has sharp pins at the ends of the wires. Looks like the + wire connects to the radios 90 volt B+ and the negative speaker lead to the last amplifier tubes plate ?

I know this is very basic. The radios I've worked on from the 40's and 50's though similar to the solid state then digital radios I've worked on, are worlds apart in components and how those components function. This radio and speaker takes me back even further, once again similar but a bit of a different world again.  Just trying to avoid a little mistake that causes catastrophic damage. Thats a cause and effect that covers everything.