During the summer months and with terrible AC here, i switched (for now) to a Musical Fidelity X-Al integrated amp. All the electrolytic caps  were replaced with Nichicon Muse series caps and all the caps were bypassed with Vishay bypass caps .

My tube integrated amp I used a powered sub woofer with extra cables coming off the amp and it works great.

With the SS amp p i do NOT need the sub-woofer. I keep the SS amp on 24-7, it uses an external transformer (toroidal).

The bass quality is amazing for such a small cabinet and highly musical. At 50pc at 8 Ohms, I have the keep the volume control down yet the musicality is great.