Not sure but other than the power supply (which isn't on the board anyway) the diff between a 68 and a 73 is about $10 in parts.The 1968 kit is what I have my eye on,but the only boards they have for sale are for the 1973's on up
For the 1968, you have to get the chassis with it and can only subtract the head cab & tubes
Is the ceriatone modeled after a '68?
that's getting pricey.Both are great, Ceriatone has a price advantage but you can get Mercury Magnetics trannies as options from Metro which IMHO make a huge difference especially the OT. If it were me I'd either get the Ceriatone minus the trannies and go to S2Amps for a deal on some MM iron OR get the Metro kit with the MM and Sozo upgrades. Then regardless of what option I took I'd send the finished product to Val King to get Power Scaling installed. Just my two cents......
Edit - I just realized you may be talking about finished amps not kits. If that's the case look at Soultone as well. The ability to go between JTM and Plexi modes along with Power Scaling have made that my #1 amp.
that's getting pricey.
I've had a all Mercury Trani 1987xl Plexi with sozo's etc and a Ceriatone 1986x bass plexi...both had/have NOS Mullards etc..
I will say that they we're very very close- a slight edge more on the 87x but it has more treble anyway. Great tubes and fingers go a long long way. I'm not saying that a Mercury upgrade (especially a OT) wouldn't add some magic on the harmonic end...it would...its all about how much $$$ you want to spend!