Hi Stu, Yep built em myself. They're not to complicated as they are open baffle. Top tube amps are my old 50 style SE amps
and the woofers run of thew lower amps which a 3 x 45 tubes for a whopping 5 watts. The tweeters just have a cap first order
crossover and come in at about 13.5K. The mid/high are divided from the woofer with an active crossover at 100HZ.
The speakers are field coils with high sensitivity with the batteries to power the field coils. The whole thing just kicks arse
Will update shortly now have a valve active crossover and a pair of old sub woofers added.