Perhaps it was a bit pre-mature to close this issue. The OP posted an image with 10mV peak-to-peak output signal. This is a bit low for a 100W amplifier. Indeed it is not a circuit issue, but an ‘altenate node’ issue, i.e. KiCad/Eeschema specific.
The node sequence for the EL34 tubes is wrong. There is an alternate node sequence set. This sequence however, does not belong to the EL34 subcircuit, but to the A_EL34 subcircuit. So selecting the subcircuit A_EL34, while attaching the model, for each of the EL34 will yield some reasonable output, still distorted and too low (14 V peak to peak). But now circuit optimization may take place.