Audio SpaceRef 3.1 300BnewAudio Space Ref 3.1 300B Superb 300B Int amp w/phono stageAsk us about 6 months NO INTEREST & NO PAYMENTS thru PayPal Call us at 770-667-5633 with questions. Call to discuss this superb amp as well as our low current pricing.The Audio Space Referen...4290.00

Sorry, this listing has ended.

You may like one of these similar items:

Audio Space Ref 3.1 300B Superb 300B Int amp w/phono stage [Expired]

no longer for sale

Ask us about 6 months NO INTEREST & NO PAYMENTS thru PayPal

Call us at 770-667-5633 with questions. Call to discuss this superb amp as well as our low current pricing.

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 in August 2009. 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 13,000 points of AudiogoN #1 rated feedback and call to discuss this superb amplifier.

We accept PayPal, AMEX, Visa, Discover, MasterCard, Bank Wires & money orders.
No charge for charge cards. 
GA and & HI residents add sales tax.

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, April Music, Audio Space tube electronics, Audeze headphones, Auralic music streamers & DAC's, Bob Carver tube amps and loudspeakers, Burson Audio, Creek, DSPeaker room correction, EAT Turntables, ELAC speakers, Emerald Physics speakers, amplifiers & DSP crossovers, Epos, Focal headphones, Gallo speakers, Graham Slee, Iso-Acoustics, Jolida tube electronics, LSA speakers, Lehmann phono stages, Marantz Reference, Micromega, MOFI Turntables, MrSpeakers headphones, Musical Fidelity, Music Hall turntables, Ortofon cartridges, Outlaw Audio, Peachtree Audio, Project turntables, PS Audio, Quad, Scansonic speakers, Silverline Audio speakers, Spread Spectrum Ampzilla amps & preamps, Sumiko cartridges, Sweet Vinyl click & pop filters, Syzygy wireless subs w/room correction, TriangleART turntables, Wireworld & Wywires cables

Sales policies on the Underwood Hifi Inc. website at

underwoodwally member since July 2000

Underwood Hifi, Inc.  Verified Dealer
Last 12 months
Items from this seller