Hi Roger,
Thanks for the speedy reply!
On closer examination, the original owner has done the ceramic resonator BFO mod and located the BFO on the underside chassis in it's own little shielded box, complete with feedthrough caps etc.? Really nice job, actually, though a lot of the original PCB trackwork around the BFO has been scratched off, which is a bit of a shame.
Had me wondering there for a minute!
Thanks,
Jason
Jason VK7ZJA