Amazon.com: Dayton Audio HTA200 Integrated Stereo Hybrid Hi-Fi Vacuum Tube Class A/B Amplifier 200 Watts RMS with Subwoofer Output, Headphone Output, Bluetooth 5.0, with Record Player Phono Preamp and USB DAC :
The 8 best budget valve amplifiers and how to avoid getting ripped off
Best Headphone Amplifier of 2023 - Ultimate List — Audiophile ON
Sophia Electric 91-05 300B Dual-Mono Stereo Tube Amplifier