I have an original John Broskie 12B4 Constant Current Draw Amplifier kit that I bought eons ago, but never got around to starting. It's now unobtanium.
Broskie's kits feature top quality parts, from the PCB to Nichicon and Panasonic electrolytic caps; WIMA metal films, etc. I also bought premium 600V RTI 1 MFD caps (those cost me $23!). Includes the 4 tubes, mounting hardware, etc. etc. Selling for under cost.
$159 + shipping
Broskie's kits feature top quality parts, from the PCB to Nichicon and Panasonic electrolytic caps; WIMA metal films, etc. I also bought premium 600V RTI 1 MFD caps (those cost me $23!). Includes the 4 tubes, mounting hardware, etc. etc. Selling for under cost.
$159 + shipping