Viewing the photos posted above reminds me why I really didn't like that amp (and haven't had one in many years, like 30+). Grids should be directly grounded. Filament transformer should be center tapped with positive bias from a simple zener applied to the center tap to bias the tubes, and large resistance switched in series with that to completely cut them off in standby; relay power should be relay power and serve no other purpose; and those round doorknob-looking caps should be real RF rated capacitors and not stuff from old TV sets (which is what Yaesu used in the ones I've seen). I completely reworked WA6NCN's FL-2100 back in about 1989 and this resulted in a more stable amplifier and higher output power on 10m, which was a good band at the time. Some really like that amp, but I never did.