Fosi Audio T20 Bluetooth Tube Amplifier Unboxing, Review and Teardown

Unboxing, review and basic teardown of the Fosi Audio T20 Bluetooth Tube Amplifier.
It really does sound amazing and sounds better with the GE Jan 5654W tubes, I've now ordered some Mullard M8100 NOS tubes.
It drives my 86db Tibo Harmony 2 and 89db Polk S50e speakers really well, it can play very loud without distortion.

This amp uses the tubes for the pre-amp buffering, the tubes do run at 100vdc, the TI TPA3116 is used for the Class D amplification.

Speaker Start Delay Project:
https://youtu.be/oUH6x4hy9Ck

Specs:
CSR64215 Bluetooth 4.2 core support aptX low latency
50W RMS X 2 (4 ohms, 20 Hz - 20 kHz, 0.04% THD)
6J4 tubes, tubes can be replaced by 6K4, 6J1, GE5654, 6AK5, 6ж1П, 6BC5, 403A/B, EF40, EF95
Headphones output: 16-64ohm
Amplifier Chip: TI TPA3116
Audio input: RCA input + Bluetooth input
Audio output: 1 set of Banana Speaker Jacks
Frequency: 20Hz-20KHz
Class D power amp
Tube pre-amp

Purchased from: https://www.amazon.co.uk/Bluetooth-Amplifier-Receiver-Integrated-Headphone-Black/dp/B07Q26T5N7
Fosi Site: https://fosiaudio.com/collections/frontpage/products/t20-bluetooth-tube-amplifier-stereo-receiver-2-channel-class-d-digital-mini-hi-fi-power-amp-preamp-compact-integrated-headphone-amplifier-for-home-passive-speakers-with-6j4-vacuum-tubes-power-supply-by-fosi-audio
GE Jan 5654W Tubes: https://www.watfordvalves.com/product_detail.asp?id=3641

Aiyima version:
https://www.aliexpress.com/item/32990828214.html?spm=a2g0s.9042311.0.0.b1ce4c4dzQ2vq6

Music: https://www.bensound.com

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