Kriz Tan has posted a review of the BAT VKP6 phone stage at Hi-Fi Senses. His conclusions:
” However, on the vocal part of songs in Jazz and slow rock, tube amplification haunting tone keeps me hesitating to change my gears. The full tube combination has the virtual holographic sensation that solid-state amplification is hard to beat. But, with this VKP6, I would say the effect was very close!”
You can read the full review here.