If you are looking for a warm sound you should try to find an amp that uses EL34 type tubes. This Primaluna Prologue should fit the bill!
https://www.upscaleaudio.com/collections/primaluna/products/primaluna-prologue-premium-integrated-am...
https://www.upscaleaudio.com/collections/primaluna/products/primaluna-prologue-premium-integrated-am...