I also added a Lar/Mar PPIMV that replaced a variable NFB pot (which was of limited use).
This amp came ALIVE !!!
--- even with an "initial test" preamp tube set (Sovteks and a JJ) this one is producing tone similar to clips i've heard of higher wattage versions---- it doesn't have the chest thump of a 100 watter, of course, but it's a lot of fun to play.Some differences in this amp are .015uF coupling caps on V1A&B---- V1 plate load resistors are 82k--- and the treble peaking and bright caps are removed---- the 470k/470k voltage divider is now 330k (series)/470k (ground)---- these changes were already in the amp before i did the #34 mods, no real reason to change now considering how the amp sounds.
I built a quick 50 watt turret board version of the four preamp tube AFD-type amp out of a gutted Laney AOR 50----- it also works well---i'll have to A/B these two after i get a better preamp tube set in the 25 watt #34 and do any tweaks as needed----now it's bright, a little naselly, and has great controllable feedback. And Big Balls for a 25 watter.
Just got a new pre-punched steel JCM 800 2204-type chassis in from Watts---i wanted the aluminum blank JCM 800 chassis but they sent this one by mistake---- it's such a well-made chassis that i'll keep it and order another blank aluminum chassis for the build i was planning for it (150 watt channel switcher)------ the pre-punched steel chassis would make a great base to build a KT88x2 #34 into.
Would a #34-type amp with only two big bottles be a #17 ? If so, my 25 watter would be a #8.5................gldtp99
Another player was over and witnessed all this and he liked the two 50 watters the best---- but he listened only because he didn't bring a righthanded guitar to play---- i'm a lefty and i offered him any of my guitars to play, but he declined.