Minotaur Direct-Coupled Hybrid Integrated Amplifier

$ 3,290.00

The Minotaur is temporarily sold out, but we are building more continuously. Please contact us to add your name to the wait list (info@tavishdesign.com). And, please read Steve Guttenberg's recent review on CNET and also the review by Ron Nagle in EnjoyTheMusic. Thanks!

Product Brochure         Owner's Manual         Front Photo         Top Photo

Features

  • Vacuum-tube signal path with a transistor output stage
  • 7-tube direct-coupled design, from input stage to output
  • High-bias class-AB output stage delivers first critical watts (up to 5W/ch, user selectable) in pure class A
  • 140 W/ch 8 ohms | 220 W/ch 4 ohms
  • Classic ALPS "blue-velvet" motorized potentiometer and 5 relay-selected inputs with C&K LED pushbutton switches
  • Balanced XLR inputs offer true balanced operation with >120 dB common-mode rejection at 60Hz
  • Cool wireless remote control; no need to point, works anywhere in the house
  • Tempered Glass Window
  • Massive linear (non-switching) power supplies with 108,000 uF filter capacitance and low-noise, US-made toroidal transformers
  • 30 Amp peak output current capability
  • 320 Volt regulated high voltage supplies operate the tubes in their most linear region
  • Designed and made by hand in USA
  • 6 year limited warranty

Most other hybrid amplifiers are really just transistor amplifiers with a couple of tubes added in front as a preamp. The Minotaur is something different.

The Minotaur is a predominantly-vacuum-tube amplifier, direct-coupled to a transistor output stage. The design uses 7 vacuum tubes to handle the input, voltage gain, and driver stages of the amplifier. The high-bias class-AB (linear, non-switching) output stage uses the well-regarded MJL3281 and MJL1302 devices in a modified Sziklai configuration for outstanding linearity, and it operates in pure class-A up to either 1W or 5 W per channel (user selectable).

In developing the Minotaur, particular attention was paid both to achieving very low distortion, and also to the character of whatever small distortion was produced; at normal levels, the distortion spectrum is dominated by the single-ended 12BH7 vacuum tube driver stage and is predominantly second harmonic, like that of many musical instruments.

The Minotaur is configured as a stereo integrated amplifier with five line-level analog inputs. It has 2 pairs of balanced (XLR) input connectors and 3 pairs of unbalanced (RCA) input connectors.The XLR inputs offer true balanced operation with more than 120 dB of common-mode rejection at 60 Hz. The balanced inputs can help prevent ground-loops between interconnected equipment; they can also reject common-mode digital noise from digital sources such as disk players and DACs.

The Minotaur features instrument-like construction with high-quality components and connectors throughout. The vacuum tubes are powered from regulated high voltage and heater supplies to achieve minimum noise and operating drift. For user convenience, it has a wireless remote control (no need to point, works anywhere in the house), using a classic ALPS motorized potentiometer for volume control and OMRON low-signal relays for source selection. A system microcontroller monitors temperature, offset, and bias conditions to maintain optimal performance. Although the Minotaur includes a cooling fan, it should never come on in normal operation, so fan noise is not an issue. The cooling fan is included primarily to allow sustained operation at full power during testing and burn in. See the owner’s manual for more information.

The Minotaur takes advantage of both the linear, high-voltage-swing capability of vacuum tubes and the high-current-delivery capability of transistors, allowing the tubes and transistors to do what each does best. And, the Minotaur is direct-coupled from the input stage to the output, avoiding the use of coupling capacitors at high-signal levels, where they can cause slow recovery from overload transients (a single coupling capacitor is used at the amplifier input, to prevent a DC offset from the signal source from being applied to the amplifier). The Minotaur is one of very few hybrids on the market to directly couple the tubes to the transistors.

Each Minotaur is individually burned in and re-measured prior to shipment, and individual measurement results are included in your owner’s manual. To learn more, download a product brochure or the owner's manual, or contact us at Tavish Design (info@tavishdesign.com).

 

Parameter

Specification

Rated Power Output

140 W per channel continuous, both channels driven into 8Ω

Power Output vs. Load Impedance

190 W per channel into 5Ω

220 W per channel into 4Ω

240 W per channel into 3Ω

Output Noise

< 110 uV RMS (C-weighted 30Hz - 8kHz)

>108 dB below rated power

 

Input Sensitivity and Gain

+0 dBu (0.78 V RMS) for full output, 32 dB gain

Total Harmonic Distortion

Typically <0.08% at any frequency between 20 Hz and 20 kHz and any power level up to 120 W, 8Ω load.

<1.0% at full rated power

Input Impedance

≥50 kΩ

Output Impedance (Damping Factor)

40 mΩ at 1 kHz (equivalent to a damping factor of 200)

Bandwidth

3 Hz – 150 kHz (-3 dB, ref. 1 W @ 1 kHz) unbalanced inputs

3 Hz – 80 kHz (-3 dB, ref. 1 W @ 1 kHz) balanced inputs

Size

17.2” wide, 17” deep, 6” high

Weight

34 lbs. (42 lbs. shipping weight)

Power Consumption (120 V, 60 Hz)

70 - 160 W typical, 600 W maximum, less than 1W standby

Tube Complement

5751 (or 12AX7) x2, 12AT7 x4, 12BH7   x1

Output Transistors

MJL3281A x4, MJL1302A x4

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