Hi Bill, You could also use tetrodes connected in high=B5 configuration: 4-250 with less power 4-400 RS1002 QB3.5/750 with less power QB4/1100 Strap control-grid with screen and you are ready, gain will be=20 a bit lower but you will expect about 10-12db depending on HT value 73=20 Peter --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html ---