[BrendaAnnD]

That parts list has at least one error in it. Capacitor 4 would NOT be 100uf. As you can see, it's in the antenna section of the bandswitch circuit, and connects the antenna directly to the input of the mixer tube, bypassing the RF amp. Can't tell for sure from the schematic, but this is probably for the AMBCB, and was a common practice in communications receivers, as they wanted to optimize SW reception but felt no need to further amplify strong BCB signals. That cap would then be a 100 uuf (pf)