Hi I mostly use kit 300B SE monoblocks with my VOTTs (1505 horn). The 300b kits are DIY HifiSupply LD19 which are built on a modified WE91 circuit. Im quite happy with the result using Werner Jagusch autoformer Crossovers.

I also have Altec 604-8Gs in DIY 620 Cabs. Im using Werner Jagusch autoformer crossovers for the 604s as well. For the 604s I prefer the added control my PP Quicksilver KT88 and Mid Mono (6l6, EL34) monoblocks provide. I will also use Hypex Ncore 400 monoblocks on the 604s when using them for movies.

The VOTTs will also benefit from the more power and control of the Quicksilver PP amps when used for movies. The Hypex Ncore 400 are however not a good match with the VOTTs with my current passive Slagle autoformer pre and in my near field listening position. That may change if I assemble an active Valve pre. I have been thinking of the Trancendent sound 300B preamp.

I would like to try a good 20-50w class A transistor amp at some point with my Altecs. For eksample one of the First watt/Nelson pass designs.