Very similar to the 6T9 transmitter seen in some ARRL publications in the 1970s. I have built one and get it on the air periodically. Nice little cw transmitter. What would you modulate it with? A single 12AU7? PP 6AQ5s? Maybe screen or grid modulation would be better.
As a Johnny Novice back in 1972, I built one of these on an Olsen Electronics radio chassis. Instead of a Compactron 6T9, I used a 6AW8 from an old TV set. I stole filament power and B+ from my Hallicrafters S40B receiver. Later on I used one channel of a stereo tube amp to Heising modulate the pentode of the 6AW8. As I recall, the audio amp had two single ended 6BQ5 audio output tubes.
For CW, I actually used this setup on 80/40 and 15m. Good for a few watts!
Jim
Wd5JKO