I am about to purchase a Code 100 Head , all I have is a 4ohm 212 Cab. Is this okay to do. I know offically it is not, but for tube amps I've heard this is fine to do.
Never run a cabinet lower than the ohms output of your amp head. If you have an 8 ohm head match it or run a 16 ohm cabinet.
Thank you for your message, you will need the Cab to match the impedance of the Amp, The Code series is 8Ohms so this will need to be the same.