Good comments. Yes these sure use a minimum of parts and with One dollar 1625’s (modified tube bases) , or 6AG7’s for early low output SSB rigs; made home brew sense.
Think of that, an all 6AG7 rig, from Osc., followers, balanced Pair modulator, phase filters, drivers and finals for RF and a couple more for audio Amp section.
Get out ur soldering irons!
...And then along came 6LQ6’s and the like at these plate voltages.