I think Ten-Tec will still repair VFO's for the 540/544 (Triton series). Nice CW rig but even with the 262G PS and the outboard VOX it left something to be desired on SSB. VOmax processor really helped though. Dave K4JRB Triton IV owner (with 262G, Outboard VFO, and Digital dial) from late 70's to 1984.