1 Pedalhead 1 month ago I need help figuring this new amp. I bought 1964 bassman ebay number 224113311397 looks like great shape stamp late may1964 . Picture of chassis there seller says 6g6 b curcuit ? I not sure I have confused about rectifier . I know they stop using 1962? Is there a series diodes suppose to be on the curcuit? I can't tell if it's missing from the shot pics. There seem to be what looks like a baising pot? I will have the amp next week. I like to send it to someone that can add mod to be able to bias and if its missing the rectifier mod it. Also check fuse to hot make sure safe. Did setzer amp have these series of diodes? If u can explain what I need to do based on whaT u see on this board? If anyone knows some info wlwoild be appreciated. I added the ebay listing number . The amp looks beautiful and like it to be similar to what setzer uses 1963.. this one is 1964 but may I believe they changed over curcuit late August of the same year? Any info ?