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SA 2 Vacuum Tube Stereo Amplifier

The Stereo Amplifier Two (SA2) is the follow-on to the spectacular SA1 amplifier. Much refinement, testing, and tweaking occurred in creating this more powerful and beautiful sounding tube amplifier. The design is an extension of ‘keep it simple’, but with more power output and user features such as: triode or ultralinear operation, stereo or monoblock configuration, adjustable global feedback control and the magic eye tube output level meters with selectable brightness control.
The SA2 uses a differential pair 6BQ7A (NOS GE JAN) input tube connected to a differential pair 6SN7GTB (NOS GE), which then drives the KT88/KT90/KT120 output tubes in a push-pull Class AB ultralinear configuration. Adjustable global feedback can be tailored to provide audio reproduction qualities having more powerful and punchy low frequency extension, or add more ambiance to the midrange with slightly more warmth. The sound quality is everything one would desire in liquidity and ambiance using vacuum tubes, and still delivers the bass slam or impact heard in solid state amplifiers. With a flip of a switch, triode mode can be selected adding the warmth only triodes can deliver. However, if it is preferred to have less warmth, then switch to ultralinear for clean, articulate music reproduction. Lastly, if more power output is required, there is a monoblock switch to convert the stereo amplifier to a monoblock amplifier.

Each SA2 is hand built by Mike McGary using point-to-point wiring with tag construction, quality components throughout, and thoroughly tested before it goes to the consumer with a lifetime warranty.

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  • Class AB Ultralinear Output Stage tube amplifier with adjustable (1.5-9 dB) feedback.
  • Compatible with tube types: KT88, KT90 and KT120.
  • Capacitor multiplier circuit used for input and driver stages to minimize noise/hum.
  • Magic eyes tubes used for left and right output levels.
  • American made custom power and output transformers.
  • 4, 8, and 16 ohm output taps utilizing custom made McGary Audio gold plated binding posts.
  • Gold plated RCA unbalanced input connections located on front panel adjacent to input tubes to minimize noise, using magnetic cover to conceal if not used.
  • Neutrik XLR balanced connections on rear panel of amplifier.
  • Switchable (XLR) balanced or (RCA) unbalanced input connections.
  • Switchable Triode or Ultralinear output operation.
  • American made 13-Gauge steel enclosure…powder coated throughout (red lollypop base with satin black top plate is standard color scheme), with CNC machined aluminum decorative face and top panel plates. 
  • Russian made ceramic tube sockets with silver plated terminals (attached directly to the chassis).
  • Point-to-point and tagboard hand wired construction with 16-gauge Teflon insulated silver plated copper wire, Cardas silver solder for all electrical connections, Mundorf and Nichicon muse capacitors, and Vishay metal film resistors.
  • Detachable IEC power cord supplied.
  • Standard tube complement: (2) NOS JAN General Electric (6BQ7A) input and (2) NOS General Electric (6SN7GTB) driver vacuum tubes, (4) Russian KT88 matched quad Gold Lion output vacuum tubes. Other output tube types are available upon request. Magic eye tubes are Russian 6E3P.
  • Self-bias output tubes require no bias adjustments. 
  • Electrical Engineer designed and hand built in Gainesville, Virginia 
  • Lifetime warranty (excluding the vacuum tubes- 90 day warranty from date of purchase)
  • Color options for the SA2 amplifier can be customized for an additional cost.

SPECIFICATIONS

  • 80W rms (onset of clipping; THD +N is less than 4%), 40W rms (THD +N is less than .25%)  with 8 ohm load using KT88 output tubes
  • 20Hz – 20kHz (+/-0.25dB) bandwidth
  • Input Impedance: >90K ohms unbalanced; >20K ohms balanced
  • Sensitivity: 0.75V-1.8V rms (depending on feedback setting) rms for rated output power
  • SNR: > 85 dB unweighted/unfiltered & referenced to full rated output power at 1kHz into 8 ohms
  • Phase: Non-inverting
  • Dimensions: D= 13”, W= 17” and H= 9.25”
  • Power consumption: ~350W (depends on output tube type used)
  • Fuse: 5.0A
  • Weight: 62 lbs
  • Power: 120V-60 Hz/240V-50Hz (electrically configurable, please inquire if purchasing product for use outside the USA)

MSRP

$7,985.00 (Direct or Dealer Purchase)

$7,985.00

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