The "PA GRID" RCA phono jack on the top of my KWM-1 chassis is connected directly to the grids of the 6146s via a 50-uuf tubular coupling cap and a short length of miniature shielded cable. Vy 73, AI2Q, Alex Member: ARRL, FOC, RSGB, CWops, QRP-L, Antique Wireless Association, Wide Area Amateur Radio Network http://home.roadrunner.com/~alexmm