With the temperature comp. in place I did a max sustainable power test into a 50Ω load.
55W is ok @ 20 Meters driven by 14.5Vcc with about a 4Vpp input signal. A higher than 4Vpp input overdrives the early gain blocks and adds more harmonics.
This is CW btw.
That's a 22% power boost for little cost. No doubt the EBAY sellers would love to advertise a 55W Amp for $14 . I wouldn't be surprised that they figure this out from this project and make the cheap mods to do it and sell more value for the same price. Wouldn't you buy a 55W temp. compensated module over a 45W module for the same $$?