Search query: 300b tube amplifier

Product: Willsenton R8 KT88/EL34 x4 Tube Integrated AMP Power Amplifier Headphone (Silver)
Brand: Willsenton
Color: Silver
Relevance: Substitute
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 single-ended 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:
Frequency effect: 10Hz 40kHz (+/-0.5db)
Total harmonic distortion: 1% (1kHz)
Signal to noise ratio: 91dB
Input sensitivity: 380mv (when Integrated amp input) 820mv (when pure power amp input)
Input impedance: 100KΩ
Output impedance: 4Ω, 8Ω
Power supply voltage: 230V ± 5% (50Hz/60Hz) ~ 115V ± 5% (50Hz/60Hz)
Machine volume (400*200*390) (W*H*D) mm
Use vacuum tube: 6SN7*3.6SL7*2.KT88*4/6550EH*4/EL34*4
Power consumption: 310W
Net weight: 26kg
Rated output power:
25W+25W (RMS triode working state)
45W+45W (RMS ultra-linear working state) (KT88)
25W+25W (RMS triode working state)
40W+40W (RMS ultra-linear working state) (EL34)
One amplifier can used wiht tube EL34, KT88 or 6550, so, you can get 3 kinds of sound from different models tubes. The default matching tubes of this machine is KT88. If you need another 2 new sets of tube, please purchase in addition. There is a Red selection button on the Back of the amp to switch.
Pure hand-made, Point to point manual welding.
Willsenton R8 is an integrated Amplifier, it is a Power Amplifier too (there is a group Power amp input), it is a Headphones amp too.
Triode and ultra-linear selection are available which can be switched by the button on the amplifier. (When the indicator light is Green, it is triode working. When the indicator light is Red, it is ultra-linear working .)
With a remote control,Vacuum tube protective cover,Fuse and an English manual.