Reference-X 211SE Stereo Power Amplifier

Audio Experience Reference-X 211SE is a SE 27W x 2 Stereo Valve Tube Power Amplifier.

The power amplifier use one 211 power tubes work at Class A Single Ended Triode no negative feedback configuration status to provide 27W adequate output . Moreover, It use the high quality output transformer ( Hasimoto . made in Japan).

The input stage is 5687WB tube use AudioCap Theta coupling cap to 5687WB driver tube, The driver tube use Cardas coupling cap to 6189A cathode follow driver stage, The cathode follow stage is direct coupling to 211 tube work at SET Single Ended Triode mode to driver Hasimoto special grade high quality output transformer , The Hasimoto CUT CORE orient high B output transformer has very low Insertion Loss 0.3dB only. ( Many SET tube power amplifier in Hi-End audio market , Their have the output transformers is over 2dB Insertion Loss . only about 10% very high price tube amplifier use under 1dB Insertion Loss of output transformer ) . The output transformer has low insertion loss is very important , the best of the best is 0 dB Insertion Loss , The output transformers for High End tube amplifier need under 1dB Insertion Loss . The Insertion Loss over 1.5dB output transformer will lost many low level music.

The power supply with two separately HVB+ power supply for power output stage and input driver stage:
One Hasimoto power transformer with Hasimoto C-core choke and 4 pcs GZ34 rectifier tubes for power output stage..
Other One Hasimoto power transformer for input and driver stage

This power amplifier case structure and parts arrangement are perfect, the signal path is directly and shortly connected. Great heat dissipation, an anti-shock and anti-RF function to guarantee it works at a very stable status. For sure, this machine is produced by point-to-point methodology.

Features

Class A Single Ended Triode no negative feedback
The two power transformer are Hasimoto transformer , made in Japan.
The output transformer is Hasimoto H-40-10S CUT CORE orient high B output transformer , made in Japan
The Choke is Hasimoto C-10-200W CUT CORE orient high B.
The power supply with two separately HVB+ power supply for power output stage and input driver stage.
The power supply of power stage with 4pcs GZ34 rectifier tubes
Coupling caps use Jupiter Copper foil (wax paper and Polypropylene film) and MultiCap RTX
The speaker connections is Star(Germany)
The inside wire have uses IN-AKUSTIK , Sommer cable.

The speaker connections are Star(Germany)

Coupling caps use Jupiter Copper foil (wax paper and Polypropylene film) and MultiCap RTX

Hasimoto H-40-10S CUT CORE orient high B Output Transformer

Specifications

Output and T.H.D :
1W per channel , 1kHz total harmonic distortion typically 0.5% (1% at 30Hz , 0.5% at 20KHz)
27W per channel , 1kHz total harmonic distortion typically 5% (rated output)

Input : RCA one pair

Input Impedance : 100K ohm.

Frequency Response:

Test at 1W 20Hz ~ 63kHz (20Hz -1.5dB, 20kHz -0.1dB, 63KHz -3dB)
Test at 27W 20Hz ~ 60kHz (20Hz -2.5dB, 20kHz -0.1dB, 60KHz -3dB)

Input Sensitivity : 0.95V / 27W (rated output) 24.5dB Gain (test at 8ohm.)

Output impedance : 4 ohm, 8ohm , 16ohm

Noise: Less than 1mV

Phase Mode : Normal

Construction: Copper and High quality aluminum

Tubes Required: 5687WA x2 ,6189A x2, 211 x 2, 5AR4(GZ34) x 4.

Dimension: 430mm x 410mm x 300mm (W x D x H)

Total Weight: 33kg

Power Source: 110-117 or 220-240V,50/60Hz

Actual Price: HK$41300

The output transformer from Hashimoto H-40-10S upgrade to Hashimoto special grade add extra cost HK$4500.

Hashimoto special grade Output Transformer have better low frequency response than H-40-10S.
Test at 1W 20Hz ~ 63kHz (20Hz -1dB, 20kHz -0.1dB, 63KHz -3dB)
Test at 27W 20Hz ~ 60kHz (20Hz -1.5dB, 20kHz -0.1dB, 60KHz -3dB)

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