This Module is currently available.
Tube headphone Amp
Very simple but effective stereo headphone tube amplifier, with balanced output. Input right is normal to left input so it can be used to monitor mono or stereo channels. Balanced output with very low impedance. Compatible with 6j1P, 5654, 6AK5, EF95 tubes. Built with High Performance Audio Operational Amplifiers OPA2134 and NOS OTK Russian Tubes.
+5v power consumption can be switched to be taken from +12v bus.
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These merchants probably sell this module. Huh?
Touell Skouarn Amplaer Red Elektrek