For sale a Consonance Cyber 20B tube headphone amp. Uses one 12au7 tube and two EL84 tubes. Wonderful sound. Well reviewed. Retail price : $700The amp has a slight problem – there is a hum present through your headphones. The hum is slight when using high impedance cans like Sennheiser Hd600, but much louder with low impedance headphones. For this reason I do not recommend using low impedance headphones with this amp.
The hum is audible if music is paused, or during quieter passages in music. Otherwise its not bothersome with high impedance headphones. The hum is a common problem with this amp and has to do with the transformers supplied. You may wish to have the transformers upgraded or replaced, or consider re-routing the wiring inside the amp to help the problem. This thread has some info: http://www.head-fi.org/t/587096/advise-on-consonance-cyber-20-suitable-tubes Otherwise the amp works well and sounds great. Has two 1/4” outputs for headphones and a pair of RCA inputs. Here are the specs:
Control Functions: Volume, Gain (low/high) Switch, Power On/Off
Output Impedance: (low) 10-200 ohms , (high) 200-600 ohms
Output Power at 1 kHz: 1W x2 RMS
Bandwidth at -3dB: 20Hz - 40kHz (1W)
Signal / Noise: 90dB
Input Interfaces: 1 group (RCA)
Input Impedance: 50k
Input Sensitivity for Rated Output: 900mV
Output Interfaces: 2 groups (6.5mm Mic Jack)
Consumption: 26W
Vacuum Tube: EL84x2, ECC82x1
Dimension: 190 (L) x 145 (W) x 112(H) mm
Weight: 9kg (packed) The amp comes with a bunch of tubes for tube rollowing: RCA cleartop 12au7 and Sylvania 5814A, with a pair of Telam El84s and a pair of Russian 6n14n-EV (EL84 equivalent) Original box, with power cord provided. No manual. Ships via fedex ground. Buyer pays exact shipping. This is a 21 pound package. Shipping to the east coast from $15-$20 and to the west cost up to $45 depending on location. USA sales only.
I have 100% feedback on audiogon and ebay under 'vrao81'
| 
