In need of Crate schematic. Any amp with Flexwave (preferably Flexwave 5) circuitry.GTX VTX or equivalent. GT 3500 schematic would be nice.
Has anybody got any information about how the Flexwave circuits have evolved through different versions.Timeline of changes would be usefull.
Any mod suggestions? Shoddy workmanship,low quality parts,not enough solder in printed circuit traces, what else could be improved? :loco

Randall has something called Valve Dynamic in their G3 series amps (possibly designed by Bruce Egnater).12 AT7 driver(?) tube before MOSFET power section.What is the verdict? is it just a fancy pilot light(ala behringer tube pre-amp), or does it serve a purpose?Does anyone know the operating voltage and the real!! function of that tube? Teemu K, is this valve dynamic in the vain of vox design ,which according to your investigations,i believe, was a "scam". With right speakers the amps sound great(they are intented to be used in metal music)but am i blinded by marketing departments "fairy dust" or fake glow of a makebelieve tube?

What about that book you wrote. Is  it allready available somewhere? Pdf file?...to be found where?Lookin forward to that.
Is it possible that you would share some thoughts about Pritchards designs (i Know that they are beyond the scope of DIY Forum-if this is such) but the Amps sound great and the circuitry is interesting so ...please share some of that expertise.Any insight of that 12AX7 pre-amp tube emulator with two IC's.