[Amps] Help Alpha 77-DX

[w6ru at bak.rr.com (Terry Gaiser)]

Guys,
I am repairing / rebuilding a 77DX amplifier. The "A" & "B" band positions
are both for 160 meters ... the manual says that on "B" position additional
loading is provided ... was this a after the fact mod ? Schematic shows
nothing on band switch for a second 160 meter position and this 77DX is
earlier serial number and did/does not have but the one 500 pf load cap
switched in on 160 meters. What am I missing ?
Thanks,
Terry W6RU