Some history in the link below. It seems as though the company only lasted four or five years at most. Don't know what the downfall was, but there was a lot of competition in the UK making tube amps, at this time in history (Selmer, WEM, Carlsbro, Impact, Sound City, HiWatt, Marshall, VAmp, and probably some others I don't know about) :
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Schematics of the 100 watt models:
Guitar Tube Amp Schematics
YouTube Demo of the AP 200 (although this guy is not cranking it up anywhere near its limit, so it seems tamer than it is in person...the mic on his video camera would have been overwhelmed anyway):
Simms watts AP200 amp demo - YouTube
Mine works perfect with no hum or hiss..very low noise floor and no cooling fan. It is unbelievably loud and stays clean long before breakup. I put NOS GE 5751 tubes in the V1 sockets of both channels because the gain was so intense with the NOS Phillips JAN 12AX7A tubes I originally tried out. It takes effects pedals very well into its input. There is no effects loop. 7.5 and 15 Ohm output taps only (close enough to 8 and 16 to be of no concern, and easy to use with a series connection box for a pair of 8 Ohm cabs) Big head case at 29" across, and it weighs around 75 pounds:
I would love to do a comparison between this amp and other 4xKT88 amps, like HiWatt 200s, Marshall Major, Trace V4 and Hexavalve, Sound City 200, Sunn 2000S, Orange 200s, and old Matamps, Webers, Reeves 225, Meat Smoke, Electric amps, or a Traynor YBA-3A Super Custom Special, but
where, when and how will I ever find even two of these amps side by side? I would be shocked if there exists a louder, 4xKT88 amp ever made than this amp with its ultra-linear output configuration and really giant transformers (notably larger than those in my SVT-II non-pro). I drive a Bag End 410 with it, which is an efficient cab even though it can take 800+ watts. LOUD and CLEAR but still distinctively power tube sound. It has jumpers at the mains transformer that can be easily reconfigured for Voltages/Frequencies in the US or Europe. Made to be used around the world.
These amps are so rare, that there is only one other TB member (Bassmec, who posted above) who has one, and he is in England. The close-up picture he shows of the power valves is actually my own picture of my amp, but so what? He knows a lot more about them, and about electronics in general, as he is an audio engineer with his own pro studio. His is a slightly older version that says "Super" where mine says "Pow!" on the plexi front faceplate. I think they are schematically the same as each other. I wonder who else in the US might have one of these? Seems like there are more of the 100 watt versions (4xEL34 power tubes) around, compared with the 200 watt beasts.
