[Electronic M]

Originally Posted by Fran604g

Thanks, I didn't know that. That's a simple solution, for sure - "capacitor coupling" the stages instead of a transformer? Is that the correct terminology for the circuit?

Like this?

Yes but the grid resistors need to be 1-2 Megaohms not kiloohms. Once it is passing audio you may want to experiment with caps between .47 and .01, plate resistors between 8k and 15k, etc to optimize volume and tone. Audio amplifiers of that time were spectacularly inexact devices and could opperate deceptively normally with component values far from design or optimum.
What I gave you should get it to pass audio.
You will need a high impedance speaker/headphones or an audio matching transformer and a low impedance speaker... the plate resistance of a 01A is 11k ohms so you want an audio transformer with a primary impedance between 9k and 13k, and a secondary impedance that matches your speaker. Any transformer rated over 5W is probably over kill.