Canary Audio M350 Monoblock Amplifiers

Canary Audio M350 Monoblock Amplifiers

50 Watts of Pure Class A 300B Triode Power. True Jensen Transformer-Balanced Input. Handcrafted in California, USA.

The Canary Audio M350 Monoblock Amplifiers combine the musical heritage of directly heated 300B triodes with a powerful Class A push-pull output stage. Designed for discerning audiophiles, each monoblock produces 50 watts RMS from four 300B output tubes, supported by two 6SN7 signal and driver tubes.

Unlike conventional low-powered single-ended 300B amplifiers, the M350 uses a sophisticated push-pull configuration to provide greater output capability while retaining the manufacturer’s commitment to premium tube amplification.

Oversized custom-wound power and output transformers, carefully selected components and a substantial handcrafted chassis complete the M350’s distinctive high-end design.

The latest documented configuration also introduces a genuine balanced input using a Jensen line input transformer, allowing the M350 to integrate with compatible high-end preamplifiers.

Recognised in the Stereo Times 2020 Most Wanted Components Awards alongside the Canary Audio C1800 MK-II preamplifier, the M350 has also received an extensive independent review from Stereo Times Senior Editor Key Kim.

The Muscular Canary – 300B Triode Amplification with Authority

Canary Audio describes its powerful valve amplifiers with the memorable phrase “The Muscular Canary.”

The M350 embodies this philosophy through a combination of traditional directly heated triode engineering and increased power output.

Many conventional single-ended 300B amplifiers produce approximately eight watts per channel, depending on their design. The M350 instead employs two matched pairs of 300B tubes in each monoblock to achieve its manufacturer-rated 50 watts RMS.

This higher power capability offers increased flexibility when selecting compatible loudspeakers, especially for listeners seeking the attributes of tube amplification in larger or more demanding stereo systems.

Pure Class A Push-Pull 300B Design

The Canary Audio M350 is a Class A push-pull vacuum tube monoblock power amplifier.

In a push-pull circuit, complementary halves of the output stage work together through the output transformer.

Compared with a conventional single-ended design, this architecture allows greater power output from multiple output tubes and can influence the amplifier’s distortion characteristics.

Canary Audio developed the M350 to combine the operating characteristics of 300B triodes with increased power and dynamic capability.

Class A amplifier operation generates considerable heat, making adequate ventilation and suitable installation essential.

Four Legendary 300B Tubes per Monoblock

Each Canary Audio M350 uses four 300B directly heated triode output tubes.

Two matched pairs are employed in the power amplification circuitry of each channel.

A complete stereo pair uses eight 300B output tubes.

The 300B has a long history in specialist audio amplification and is particularly associated with transformer-coupled vacuum tube designs.

Canary Audio’s implementation uses a high-power push-pull circuit rather than the low-output single-ended topology found in many traditional 300B amplifiers.

Two 6SN7 Driver Tubes per Monoblock

In addition to the four 300B output tubes, each M350 uses two 6SN7 dual-triode vacuum tubes in its input and driver circuitry.

The 6SN7 is a well-established small-signal tube used in a wide range of premium audio amplifier designs.

These tubes support the signal amplification and drive requirements of the M350 output stage.

The manufacturer-published tube complement is therefore:

• 4 × 300B output triodes per monoblock
• 2 × 6SN7 input and driver tubes per monoblock
• 8 × 300B and 4 × 6SN7 across a complete stereo pair

Solid-State Power Supply Rectification

The independently published Stereo Times review describes the M350 as using solid-state rectification rather than a vacuum tube rectifier.

This is an important difference between the M350 and certain other Canary Audio amplifier designs that use dedicated rectifier tubes.

A solid-state rectifier converts alternating current from the power transformer into the direct-current supply required by the amplifier’s electronic circuitry.

The manufacturer’s published tube complement lists the four 300B output tubes and two 6SN7 signal tubes per monoblock.

50 Watts RMS per Channel

Canary Audio specifies 50 watts RMS per monoblock.

In a stereo installation, one M350 powers the left loudspeaker and the second powers the right loudspeaker.

The resulting system provides a dedicated 50-watt amplifier for each audio channel.

When selecting loudspeakers, it is important to consider sensitivity, nominal and minimum impedance, listening distance and expected playback levels.

The M350’s power rating provides greater headroom than many lower-powered 300B designs, but suitability should always be evaluated for the chosen loudspeaker system.

True Balanced Input with Jensen Line Input Transformer

One of the most important features of the current Canary Audio M350 Monoblock Amplifiers is the balanced analogue input employing a Jensen line input transformer.

Canary Audio specifically describes the balanced input as a genuine transformer-based balanced connection rather than a conventional single-ended circuit fitted with an XLR socket.

A transformer-coupled balanced interface can provide effective balanced signal reception and galvanic isolation, depending on its electrical implementation.

This makes the M350 an interesting choice for systems using compatible premium preamplifiers with balanced analogue outputs.

Please note: An earlier M350 reviewed by Stereo Times was described as having RCA inputs. Confirm that the supplied production units include the manufacturer’s updated Jensen balanced input configuration before ordering.

Custom-Wound Power and Output Transformers

Canary Audio specifies massive custom-wound power and output transformers developed by the company’s engineers.

The power transformer supports the electrical requirements of the amplifier’s output stage and associated circuitry.

The output transformer provides impedance matching between the 300B amplifier circuit and the connected loudspeaker.

Transformer design influences the amplifier’s frequency response, power handling, electrical characteristics and load matching.

For the M350, Canary Audio emphasises the use of substantial transformer construction as part of its approach to high-power 300B amplification.

Inside the Canary Audio M350 – 300B Tube Architecture

The following authentic M350 photograph shows the amplifier’s gold-anodised top panel, output tubes and smaller 6SN7 signal tubes.

The clearly marked amplifier chassis identifies the M350 and shows its carefully arranged vacuum tube configuration.

Precision Bias Adjustment for the 300B Output Stage

The M350 incorporates clearly marked bias adjustment and test positions for its output tubes.

Correct bias is essential for establishing the intended operating conditions of a vacuum tube power amplifier.

The Stereo Times review discusses checking and adjusting the 300B tube bias in accordance with the manufacturer’s guidance.

When replacing output tubes, the applicable bias procedure should be followed.

Safety: Tube amplifiers contain potentially dangerous voltages. Bias adjustments must be performed only according to the manufacturer’s instructions and by personnel competent to work safely with high-voltage equipment.

Canary Audio M350 – Individual Bias Test Points

This second genuine M350 technical photograph shows the clearly marked 300B bias adjustment controls and test points.

The accessible markings are part of the amplifier’s service-oriented design and help identify the corresponding output tube positions.

150kΩ Input Impedance

The Canary Audio M350 has a published input impedance of 150,000 ohms.

This relatively high input impedance can offer a suitable interface with many premium line-level preamplifiers.

Electrical compatibility must still take into account the selected input connection, source output impedance and overall gain structure.

0.75V Input Sensitivity

The manufacturer specifies an input sensitivity of 0.75V for full rated output.

With a high-output DAC or line preamplifier, the amplifier may reach full power before the volume control approaches its maximum setting.

Appropriate volume management and system gain matching are therefore essential.

Wide Frequency Response: 10Hz to 80kHz

Canary Audio publishes a frequency response of 10Hz to 80kHz, ±1dB.

This electrical bandwidth extends well beyond the conventional audible frequency range and reflects the manufacturer’s transformer and amplifier design objectives.

The actual acoustic response of the completed stereo system depends on the connected loudspeakers and listening environment.

Low Distortion and Noise Specifications

The manufacturer lists total harmonic distortion at less than 0.2%.

The published signal-to-noise specification is expressed as -81dB below 1 watt.

These figures are manufacturer-rated technical specifications and should not be confused with independently measured performance.

Appropriate electrical grounding, cable routing and upstream equipment selection remain important for maintaining low noise in a high-end stereo system.

4Ω and 8Ω Loudspeaker Connections

The M350 offers loudspeaker connections for nominal 4-ohm and 8-ohm loads.

Transformer-coupled tube power amplifiers should be connected using the appropriate output terminals for the selected loudspeakers.

Real loudspeaker impedance varies across the frequency range. The nominal impedance rating alone does not describe the entire electrical load.

Chameleon Audio can assist with matching the M350 to suitable loudspeakers and room requirements.

Handcrafted in California, USA

The Canary Audio M350 is handcrafted in California, USA, using a combination of specialist vacuum tube engineering and substantial mechanical construction.

Its gold-anodised aluminium upper panel, exposed 300B tubes and enclosed transformer section create an unmistakable high-end appearance.

The manufacturer’s attention to construction is also evident in its custom transformer assemblies, tube layout and output connections.

Stereo Times Most Wanted Components Award 2020

The Canary Audio M350 received recognition in the Stereo Times Most Wanted Components Awards 2020.

Senior Editor Key Kim selected the M350 monoblock amplifiers together with the Canary Audio C1800 MK-II preamplifier.

The award publication highlighted the combination’s natural musical presentation, midrange quality and ability to reproduce demanding musical performances.

Read the Stereo Times Most Wanted Components Awards 2020.

Independent Review – Canary Audio M350 by Key Kim

The Canary Audio M350 was reviewed by Stereo Times Senior Editor Key Kim in March 2021.

His extensive review examined the amplifier’s design, tube complement, system integration and musical performance.

The review describes the M350 as a powerful alternative to conventional low-output 300B amplifiers, with particular praise for its natural instrumental presentation, dynamic range and soundstage reproduction.

Key Kim also compared the experience of the M350 with the smaller Canary Audio M330 and discussed the important influence of output tube selection.

For the complete review, see Canary Audio M350 Monoblocks Review at Chameleon Audio.

The review covers the particular M350 configuration supplied for evaluation. The exact tube brand and input connection arrangement of current production units should be confirmed before purchase.

Matching the M350 with Canary Audio C1800 MK-II

The M350 has a particularly significant relationship with the Canary Audio C1800 MK-II Tube Preamplifier.

The combination was selected in the Stereo Times 2020 Most Wanted Components Awards.

The C1800 MK-II provides genuine balanced analogue connectivity and a separate vacuum tube power supply, making it an especially relevant preamplifier to consider alongside the latest balanced-input M350 configuration.

Actual system compatibility and input-output matching should be checked for the selected units.

M350 vs M330 – Choosing the Right Canary Audio Monoblocks

The Canary Audio M350 builds upon the manufacturer’s experience with smaller 300B monoblock designs.

The Canary Audio M330 Monoblock Amplifiers offer an alternative within the brand’s 300B product family.

The independent Stereo Times M350 review discusses listening experiences with both amplifiers, providing useful context for enthusiasts evaluating different power levels.

Choosing between them depends on loudspeaker sensitivity, available space, desired output power and listening preferences.

M350 vs M600 – Two Approaches to 50W 300B Amplification

The M350 and Canary Audio M600 Monoblock Amplifiers share the manufacturer’s nominal 50W RMS power rating and four-300B output tube concept.

However, their supporting circuitry, power supply architecture, mechanical construction and tube complements differ.

The M350 uses four 300B and two 6SN7 tubes per monoblock and is documented with solid-state rectification.

The M600 uses four 300B, two 6SN7GTB and two 5U4GB rectifier tubes per monoblock.

These differences make it important to evaluate each design independently rather than assuming identical performance from the shared output rating.

Careful Installation and Ventilation

Each M350 monoblock has a substantial physical construction and requires appropriate equipment support.

The manufacturer publishes dimensions of 12.5 × 20 × 8.25 inches and a net weight of 50lb per monoblock.

Class A vacuum tube equipment produces heat during normal operation.

Allow adequate ventilation around the valves and transformer enclosure, and avoid placing the amplifier where the tubes could be touched accidentally.

Always follow the manufacturer’s installation and safety instructions.

Canary Audio M350 Special Features

• Class A push-pull 300B monoblock power amplifiers
• 50W RMS rated power per channel
• 4 × 300B directly heated output triodes per monoblock
• 2 × 6SN7 signal and driver tubes per monoblock
• 8 × 300B output tubes across a stereo pair
• Genuine Jensen transformer-coupled balanced input in the updated configuration
• Massive custom-wound power and output transformers
• Solid-state power supply rectification described in independent review
• Accessible 300B bias adjustment and test points
• 150kΩ published input impedance
• 0.75V input sensitivity for full rated output
• 10Hz–80kHz frequency response, ±1dB
• Less than 0.2% manufacturer-rated THD
• 4Ω and 8Ω loudspeaker outputs
• Handcrafted in California, USA
• Stereo Times Most Wanted Components Award 2020 recognition
• Independently reviewed by Stereo Times Senior Editor Key Kim

Canary Audio M350 Technical Specifications

Specifications are based on Canary Audio’s published M350 information. Tube brands, current production input connections, dimensions and other details should be confirmed for the selected units. The 2021 Stereo Times review describes an earlier RCA-input configuration.

Official Manufacturer Specifications

Canary Audio M350 Official Product Page

Canary Audio M350 Frequently Asked Questions

What is the Canary Audio M350?

The Canary Audio M350 is a Class A push-pull vacuum tube monoblock power amplifier using four 300B directly heated triodes per channel.

How much power does each M350 produce?

Canary Audio specifies 50 watts RMS per monoblock.

How many 300B tubes are needed for stereo?

Eight 300B tubes in total, with four in each monoblock.

Is the Canary Audio M350 a single-ended amplifier?

No. It uses Class A push-pull amplification rather than conventional single-ended topology.

Does it include genuine balanced inputs?

The current manufacturer description lists a Jensen transformer-coupled balanced input. Confirm that this feature is present on the supplied production units.

How many 6SN7 tubes are used?

Two 6SN7 tubes per monoblock, or four across a stereo pair.

Does the M350 use tube rectification?

The 2021 Stereo Times review describes solid-state rectification, and the manufacturer’s tube complement does not list rectifier valves.

What is the input sensitivity?

0.75V for full rated output, according to Canary Audio.

Can it drive 4-ohm loudspeakers?

The M350 provides outputs for nominal 4Ω and 8Ω loads. Complete speaker impedance and sensitivity should be considered.

Does the M350 need a preamplifier?

Yes. As a dedicated power amplifier, it should be used with suitable source selection and safe volume control.

Can the M350 be paired with the C1800 MK-II?

Yes. The combination was specifically recognised in Stereo Times’ 2020 Most Wanted Components Awards. Confirm current production input compatibility before ordering.

Has the Canary Audio M350 been independently reviewed?

Yes. Stereo Times Senior Editor Key Kim published an extensive review in March 2021.

Did the M350 receive an award?

The M350 and C1800 MK-II were selected together for the Stereo Times 2020 Most Wanted Components Awards.

Are 300B tubes included?

The tube brand and supplied configuration depend on the selected product variation. The original Stereo Times review describes an evaluation pair fitted with Genalex Gold Lion 300B tubes. Confirm the current package contents with Chameleon Audio.

How heavy is each amplifier?

Approximately 22.7kg per monoblock, excluding packaging.

Where is the M350 manufactured?

Canary Audio states that it is handcrafted in California, USA.

Is international delivery available?

Contact Chameleon Audio to confirm the selected product variation, availability, safe packaging and international shipping arrangements.

Why Choose the Canary Audio M350 Monoblock Amplifiers?

The Canary Audio M350 Monoblock Amplifiers combine the respected 300B triode with a more powerful Class A push-pull design capable of delivering 50 watts per channel.

With oversized custom transformers, genuine Jensen transformer-based balanced input capability and carefully engineered signal circuitry, the M350 offers an ambitious approach to high-end vacuum tube amplification.

Its independent recognition from Stereo Times and its close relationship with the C1800 MK-II preamplifier make it a particularly interesting option for serious reference-level stereo systems.

Eight 300B Triodes per Stereo Pair. 50 Watts per Channel. Reference Class A Amplification.

Canary Audio M350 at Chameleon Audio

Listed price range: €13,800–€14,900, depending on the selected product variation.

Contact Chameleon Audio for exact tube options, the current balanced-input configuration, availability, preamplifier and loudspeaker matching, and international delivery.