I obtained an SB-1000 amp that works on every band but 40 meters. I found the problem but can't figure out how to fix it. The band switch wafer SW2C is supposed to switch in C26 (170pf) on 160 only, mine switches it in on 40. I have a carcass from a parts amp that is wired correctly. It looks like the wiper is off by several degrees. I took it apart far enough to move the wiper to the correct position but when I do that the wiper will not go on he shaft. The only way it fits is when it is in the 40m. position. I can't figure out how to fix it. Looks like the wafer was manufactured wrong. If there was an easy way to move the entire tank circuit from the parts amp to the good one I'd do that. It would be easy if the band switch could be removed in tact but it doesn't look like that is possible. The 160 meter input coil is burned badly on the donor amp.