Tube AMP or SS

Not quite sure about what you are looking to do...

The best, and cheapest way for you to enjoy music with a tubes is to get an integrated amp for music, then switch to the receiver for movies/TV. Your speakers are fairly easy to drive at 89dB/6 ohm.

Look for used Jolida in the 60-100wpc range. There's a 60wpc Jolida 502brc. Or, for more power, the 100wpc Jolida JD1000RC. Also the Jolida JD505

The 40wpc Primaluna Prologue Two has a little lower power, but might be a step up in sonic quality

Try one out, see if you like the sound with your speakers. There are better integrateds out there for more money, but for the price you can check it out and resell them with little or no loss.

I would go with Music Reference RM-9

I agree you should think about getting a good integrated amp with HT bypass and use the yammy for HT only. Adding a power amp isn't going to help the less than stellar pre-amp section of the HT receiver. Clarity and soundstage is more likely to come from a good pre-amp section.

Whether you choose tubes or not is another issue. At your price point you are looking at lower powered but integrates as noted by others. Pretty much any good integrated at $1k used will seriously outperform the yammy for music.