I'm not sure but I think these are 18watters
2061
1974x (I think there are slight differences with 18watt TMB)
18watt TMB - i think there are schematics of this if you check reinhardt's 18watter
if you prefer 6v6's over el84s, check the other reinhardt 18watt model too ... MI 6 yata tawag doon
all 3 I think are el84s