"Synergy" has become an abused term, more often reflecting preference and taste than electrical compatabilty. It's actually easier to mix and match with the older gear because there used to be almost a pseudo-standard for impedance, gain and sensitivity although DC coupling could be an issue. With stuff that old, decomposition is more of an issue.
I think you have the better combination already but vintage means many things.
I think you have the better combination already but vintage means many things.