The speaker I am using is a R46b with a matching trans former.(I've tried both 5000 ohm to 3.2 and 500/600 ohm to 3.2)All pots, switches, tube sockets and anything else has been cleaned with DeOxit to no avail. I even tried another matching trans 500 to 3.2 but same thing. Thanks again in advance, Niles Subic nmsubic at earthlink.net