R8 KT88 x4 Tube Amplifier Hi-Fi Integrated Vacuum Tube Amp with Headphone Output KT88，EL34 Replaceable (Black)
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The model currently on sale is the New Model upgraded in December 2023.
Features
Pure hand-made, the whole machine is welded with scaffolding.
Use a square power transformer specially developed for this machine.
The output transformer uses two high quality wideband EI output transformers.
The voltage amplification and boost stage uses a 6SN7 for power supply filtering.
The voltage amplification stage and the push stage use two pairs of 6SL7 and 6SN7 tubes, respectively.
The rear stage uses four KT88/6550/EL34 tubes for class AB push-pull power amplification.
Triode and ultra-linear selection are available.
External independent BIAS-ADJ current display header.
External EL34/KT88 tube selection function, easy to replace different types of tubes, adding endless fun.
Infrared full-featured remote control.
Use thick silver plated signal leads.
With pure post-level function, it can be connected to independent preamplifier signal input.
Power on mute delay function (about 30 seconds).
Select Japanese ALPS high-end motor potentiometer.
Easy-to-install plug-in tube shield.
Product parameters:
FTC Power Output Rating: 16W + 16W (KT88 Triode) (8ohms,20HZ-20KHZ,THD 1%)
FTC Power Output Rating: 30W + 30W (KT88 Ultra-Linear) (8ohms,20HZ-20KHZ,THD 1%)
Output Power rating (not tested under the FTC standard): 23W+23W (RMS KT88 Triode)
Output Power rating (not tested under the FTC standard): 45W+45W (RMS KT88 Ultra-Linear)
Whole machine frequency response: 12Hz-40KHz (± 1.5dB)
Harmonic distortion: 0.2% (1W/1kHz, rated output power less than 5%)
Signal to noise ratio: 89Db (weighted by A)
Input sensitivity: 320Mv (merged), 700Mv (Power stage)
Input impedance: 100k Ω
Input terminals: CD, AUX1, AUX2, PRE-IN
Output impedance: 4 ohms, 8 ohms
Headphone output impedance: 30 ohms to 300 ohms
Power supply voltage:~120V ± 5% (50Hz)
Whole machine volume: 400x390x200mm (WxDxH)
Use vacuum tubes: 6SL7x2, 6SN7x3, KT88x4
Net weight: 26kg
Power consumption of the whole machine: 280W
