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The Audio Space Reference 3.1 300B is a beautiful world Class 300B based integrated amplifier. It also offers an internal tube based phono stage.
The amp uses four 300B's, two 6SN7's and four 12AX7's. Transformers are all custom made for Audio Space. The Ref 3.1 produces 21 Class A watts and sounds a good bit louder than that is the real world. Wiring is point to point by hand and the amp runs Class-A Triode Push-Pull. It allows switching between different negative feedback levels to optimally match different systems. It can even be run as a separate power amp.
The amp received a full review in the Absolute Sound by Dick Olsher. Dick summed up with:
"It should be obvious by now that I'm wildly enthusiastic about this integrated amp. The Audio Space Reference 3.1 (300B) offers a path toward enlightenment of being one with the music. Outfitted with a vintage pair of 6SN7 or even inexpensive 7N7 triodes, its musical pleasures would be captivating at any price point. Considering its asking price, it earns my nomination for a Product of the Year award."
Read the entire review at:
The Ref 3.1 is a wonderful amp that is the class of its price range and this type of amplifier.
Rugged stainless steel chassis
High quality EI transformers and components
Switching between direct and line input
Switching between high and low negative feedback
Tube moving magnet phono stage
Innovative tube circuitry with choke coil
Point to point soldering
Read our over 13,300 points of AudiogoN #1 rated feedback and call to discuss this superb amplifier.
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Input Impedance: >56K ohm (RCA/Direct In)
Output Impedance: 4, 8, 16 ohm
Output Power: 21W/ch (Class-A push-pull)
T.H.D.: 200mV, 3-5mV (mm phono in)
S/N Ratio: greater than 80dB (hum noise under 3mV)
Tubes: 4 x 300B, , 2 x 6SN7, 4 x 12AX7 (ECC83)
Dimension: 18.5"d x 16"w x 8"h
Weight: 65 lbs
Brands carried: Acoustic Zen, Ampsandsound tube electronics, Audio Space tube electronics, Audio Alchemy, Black Ice Audio, Bob Carver tube amps and loudspeakers, Burson Audio, Core Power Technologies A/V, DSPeaker room correction, EAT Turntables, ELAC speakers, Emerald Physics speakers & amplifiers, Focal headphones, Gallo speakers, Iso-Acoustics, LSA speakers, amplifiers, headphones and turntables, Marantz Reference, Melco servers, MOFI Turntables, MrSpeakers headphones, Musical Fidelity, Music Hall turntables, Ortofon cartridges, Outlaw Audio, Peachtree Audio, Project turntables, Pure Audio Labs DAC's, Quad, RAAL headphones, Rethm speakers, Scansonic speakers, Silverline Audio speakers, SoundSmith cartridges, Spread Spectrum Ampzilla amps & preamps, Sumiko cartridges, Sweet Vinyl click & pop filters, Syzygy wireless subs w/room correction, Wireworld & Wywires cables, Wyred 4 Sound, Zesto Audio tube electronics
Sales policies on the Underwood Hifi Inc. website at www.underwoodhifi.com