I unplugged the cable that connected the F-50 circuitry to the speaker (it was connected in an 8ohm plug, and I connected a cable from that 8ohm out to one of the 8ohm out in my Einstein.
Errrrrrrrrrrrrrrrrrr, you need to unplug the speaker cable from the F-50 and plug it directly into the equivalent port on the Einstein... This will run the speaker in the combo with the Einstein. Do not power the F-50 on.
the black shadow may also be broken in a bit more as well. Plus the cab geometry is much different if im not mistaken. This makes a large impact, as well as the most important closed vs open configuration.
that was no worse than me asking about the connectors for a 2 button footswitch. I lost my brain for a few minutes there and it was fine after. You'll heal!
Glad to hear it sounds nicer! I'm gathering you may change those V-30s out of your cab eventually?