Is pre-out the same ?

Don't use cheapo patch cords to judge the tube amp!

You can use your pre out as the preamp, but I’d expect it to have an impact on the resulting sound, so you likely won’t get the full effect of the amp. Still worth a try. A pure tube chain is the best way to experience tubes IMO, but it’s also obviously more involved. Many who mix SS/tube go the route of a tube preamp and SS amp.

Check the specks in the owners manual for output impedance of pre-outs. In general, since your intg. is solid state, solid state outs are low impedance- you should be good to go.
 " I believe that it is a 1 to 10 ratio of impedance from
preamp to amp ." - general rule for tubed pre to solid state amp matching.

 There are some here, that have had good results from a solid state preamp matched with a tube amp. A good consideration would be a tubed-hybrid amplifier matched with a solid state preamp. I have this combo.

Phooey,

Get a good RCA and give it a shot. I use a SS Mac with pre out all the time.. If it sounds good it sounds good.. :-)
No bad matches so far, just some better than others..

Regards

Thanks Folks ;
   I do have an ' all tube system ' so...ya !
But this is an all-in-one box for streaming and I really
like the simplicity of this thing . It all works together and is quite easy
to operate . It is my most used system but not the one for critical listening . 

PMM - owners manual ? we don't get no owners manual !
            That spec is not listed and I have 2 emails out to the                             manufacturer . They seem to be quite busy ! ? 

You all be safe now