Here are the initial control settings for tune-up at 18.1 MHz:
Model
Bandswitch
Tune
Load
PA-76 (ALL)
21
25
75
PA-374A
21 MANUAL
25
75
PA-78
21 MANUAL
15
75
PA-77DX
12-18
195
55
The 10 MHz band has a 200 watt power limitation. Accordingly we recommend against using your ALPHA on this band.
The ALPHA PA-77, 77Dx/Sx, 78, 76, 76A, 374 and 374A should not be used on 12m. The plate choke will overheat and burn on that band.
N4UQ may offer mods for some of the above amps for 12m : http://www.n4uq.com
