Phasemation MA-3000 - monoblock power amplifiers (pair)
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Phasemation MA-3000 - monoblock power amplifiers (pair)
Product details
Phasemation MA-3000
Class A 300B triode monoblock power amplifiers
With the MA-3000, Phasemation carries forward key developments from its flagship MA-5000 monoblocks: a driver stage designed as a power amplifier in its own right, transformer coupling, and careful attention to vibration and magnetic interference.
At Ana Mighty Sound, this lineage is what interests us. The MA-3000 shares the MA-2000’s chassis format, but its internal design draws on the MA-5000. Understanding this new amplifier therefore means looking beyond its 300B output tubes.
Two 300Bs per channel, 25 watts in parallel single-ended operation
Each monoblock uses two 300B triodes in a parallel single-ended, or PSE, configuration. Both tubes operate in parallel within a pure Class A output stage, without negative feedback.
Maximum rated output is 25 watts per channel. This allows Phasemation to retain a single-ended triode architecture while providing more power than a single 300B.
For Zen Saito, the designer behind Phasemation’s amplifiers, vacuum tubes remain relevant today. His work focuses on conveying the energy and individuality of a performance, with particular attention to the speed of signal transmission.
What happens before the 300Bs
The driver stage is one of the MA-3000’s most interesting features. A triode-connected PSVANE EL34 drives the output tubes through an interstage transformer developed by Phasemation.
This stage itself provides power amplification, following the approach established in the MA-5000. The aim is to lower the impedance driving the 300Bs and preserve signal linearity.
A new toroidal power transformer was developed to meet the requirements of this architecture. The output transformers are supplied by Lundahl, whose products Phasemation has used since 2013.
Transformers: electrical function and mechanical behaviour
The work on the transformers extends to their mounting. The MA-3000 adopts the vibration-isolation structure developed for the MA-5000: a floating mount using a specially selected damping material to limit vibration transmission to the circuits, chassis and tubes.
TAOC high-carbon cast-iron feet complement this approach. Shielding around the transformers and choke coils also helps reduce the influence of stray magnetic fields on sensitive circuits.
A tube cover that forms part of the design
The tube cover deserves a specific mention: Phasemation designed and tuned the MA-3000 to operate with it in place. A silicon-steel plate incorporated into the rear of the cover contributes to magnetic shielding.
The ventilation openings feature traditional Japanese patterns. A glass front reveals the tubes, while the thick, slanted front panel retains Phasemation’s distinctive appearance.
Practical adjustments
Each monoblock provides an RCA input and an XLR input. A rear-panel switch offers three settings: 0 dB, −6 dB and MUTE. The −6 dB attenuation provides a more usable volume-control range when paired with a high-gain preamplifier.
Separate 4 Ω and 8 Ω speaker connections are provided. The rhodium-plated copper Furutech binding posts incorporate a torque limiter to prevent overtightening.
Technical specifications
| Specification | Phasemation MA-3000 |
|---|---|
| Type | Vacuum-tube monoblock power amplifier |
| Operation | Pure Class A, without negative feedback |
| Output stage | Two 300B triodes in parallel single-ended configuration |
| Driver stage | Triode-connected PSVANE EL34 |
| Interstage coupling | Phasemation interstage transformer |
| Power transformer | Toroidal, developed for the MA-3000 |
| Output transformer | Lundahl |
| Maximum rated output | 25 W per monoblock at 5% THD |
| Input impedance | 47 kΩ |
| Gain | 30 dB |
| Frequency response | 10 Hz–40 kHz, +0/−3 dB |
| Residual noise | < 200 µV, A-weighted |
| Inputs | RCA and XLR |
| Attenuator | 0 dB / −6 dB / MUTE |
| Speaker output taps | 4 Ω and 8 Ω |
| Rated power consumption | 140 W per monoblock, 100 V version |
| Dimensions per monoblock | 310 × 255 × 480 mm — W × H × D |
| Weight per monoblock | 19 kg |
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