To tell you the truth I’d be a little leery about putting a tubed amp with those speakers because both pair present a pretty tough load. IIRC, the Dynaudios are something like 84dB and 6ohms? Something like a Hegel ss integrated, I think, would be a better choice; it can handle both sets of speakers well. And it has the added bonus of a very good DAC inside!
https://www.audiogon.com/listings/solid-state-hegel-h-360-latest-2016-12-20-integrateds-06830-byram-...
https://www.audiogon.com/listings/solid-state-hegel-h-360-latest-2016-12-20-integrateds-06830-byram-...