“I have made a hybrid amp between PP-18 and P1800 into a very small old Dehay radio. Preamp section is PP18 and the power amp section is the P1800 with the four modes and VVR.
“The turret board has turrets and components on both top and bottom – mandatory to fit into this small enclosure. Three front knobs: Gain, Master, Tone. Two back knobs: P1800 selector, VVR. Sounds very good, no hum, headroom significantly increased with 12AT7 in phase inverter position.”