The JCM-SL3 January 3, 2016 admin 6F4P/6F3P/6N6P/6P1P Amps, Low Watt, Marshall Influenced Build 0 JCM800 preamp, split load phase inverter and just 3 tubes (maybe 3 watts…). It’s a little amp the whole family can tolerate. There’s a write up here along with a schematic and a bunch of clips. 6F4P Tubelow wattMarshall