Audio Space Acoustic Laboratory AS-2.8i Tube Intergrated Headphone Amplifier (4 x 6V6, 2 x 12AU7, 1 x12AX7)

Teaser Pics Now, Details Later

Vacuum Tube Integrated Headphone Amplifier
Model No. : AS-2.8i
(275 x 266 x 160) mm Weight: N.W. 7.8kg/ch / G.W. 8.9kg/ch
Input Impedance:
Output Impedance: 4-16 Ohm
Output Power: 10W x 2 Class AB1 P-P(Ultralinear), 15W x 2 Max.
Power Consumption:
Damping Factor: > 3
Frequency Response: 20Hz - 30KHz / -1dB
T.H.D.: <1% 20Hz - 20kHz(Ref. Output)>
Total Gain: 30dB
Input Sensitivity: 300mV - 600mV
S/N Ratio: 89dB
Channel Balance: /- <1dB 20Hz - 20KHz (Max. Volume)>
Channel Separation: > 60 dB (1KHz - 3.3KHz)

Tubes: 6V6 x 4, 12AX7 x 1, 12AU7 x 2
Hum Noise: less then 3mV

Present tube Rolling:

I have left the present stock Sino black glass 6V6 tubes in place since I have not decided on tube rolling types. However have rolled the following:

12AX7 changed to Telefunken Smooth Plate 12AX7 (ECC83) -


2 x 12AU7 changed to NOS Matched Pair Tungsram 12AU7 (ECC82)-