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SA 1 Vacuum Tube Stereo Amplifier

The first of Mike McGary’s creations, the Stereo Amplifier One (SA1) is the culmination of over two years designing, testing, parts tweaking, patience and much persistence in creating a beautiful sounding tube amplifier. The design is simple, practical and refined. The SA1 uses a differential pair 6BQ7A (NOS GE JAN) input tube connected to a differential pair 6SN7GTB (NOS GE), which then drives the output tubes in a push-pull Class AB ultralinear configuration. Minimal global feedback is used to provide audio reproduction quality that is delicate and airy, powerful and punchy in both high and low frequency extension. The sound quality is everything one would desire for midrange liquidity and ambiance using vacuum tubes, and yet delivers the deep bass slam or impact heard in solid state amplifiers. Each SA1 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 low (9 dB) feedback.
  • Compatible with many tube types: 6L6GC, KT66, KT77, EL34, E34L, 6CA7, 6550, KT88 and KT90.
  • Capacitor multiplier circuit used for input and driver stages to minimize noise/hum.
  • 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 input connections located on front panel adjacent to input tubes to minimize noise.
  • American made 13-Gauge steel enclosure…powder coated throughout (mint green metallic base with satin black top plate is standard color scheme).
  • 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 KT77 (EL34 or 6CA7) matched quad Gold Lion output vacuum tubes. Other output tube types are available upon request.
  • 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 SA1 amplifier can be customized for an additional cost.


  • 30W rms (THD +N is less than 0.25%), 40W rms (THD +N is less than 2.5%) waveform clipping (8 ohms) using KT77 output tubes, 50W rms using KT90 tubes
  • 20Hz – 20kHz (+/-0.2dB) bandwidth
  • Input Impedance: >90K ohms
  • Sensitivity: 0.875V 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= 8.5”
  • Power consumption: ~300W (depends on output tube type used)
  • Fuse: 3.5A
  • Weight: 46 lbs
  • Power: 120V-60 Hz/240V-50Hz (electrically configurable, please inquire if purchasing product for use outside the USA)


$3,985.00 (Direct or Dealer Purchase)



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