The Canary Audio C1800 MK-II is a reference-grade vacuum tube line preamplifier featuring genuine balanced inputs and outputs, a separate tube-based power supply and precision Swiss ELMA controls.
The MK-II version introduces true balanced analogue connectivity and a hand-built stepped attenuator, creating a sophisticated control centre for demanding high-end stereo systems.
The Canary Audio C1800 MK-II is a reference-grade vacuum tube line preamplifier combining precision analogue engineering, a separate high-voltage power supply and genuine balanced input and output connections.
Developed from Canary Audio’s renowned two-chassis preamplifier platform, the C1800 MK-II introduces an important evolution in connectivity and signal control. Its new balanced connections are implemented as genuine balanced interfaces rather than conventional single-ended circuits simply fitted with XLR connectors.
The line stage uses two 12AX7 and two 12AU7 vacuum tubes, while a matching external chassis houses a sophisticated tube-based power supply with GZ34 rectification, two 6V6 tubes, one 6SL7 tube and double-choke filtering.
Premium Swiss-made ELMA switching components and a hand-built ELMA stepped attenuator complete a design intended for demanding high-end stereo systems.
C1800 MK-II – The Evolution of Canary Audio’s Reference Preamplifier
The Canary Audio C1800 MK-II takes the manufacturer’s established two-chassis preamplifier concept and develops it with revised analogue connectivity and a precision stepped volume control.
The original C1800 was designed around a dedicated vacuum tube line stage and matching external power supply. The MK-II retains this fundamental architecture while introducing true balanced signal connections.
This makes the MK-II particularly relevant to high-end systems that combine balanced-output digital sources, premium CD players and power amplifiers fitted with balanced analogue inputs.
True Balanced Inputs and Outputs
One of the most important improvements of the Canary Audio C1800 MK-II Two-Chassis Preamplifier is its true balanced connectivity.
Canary Audio specifically states that the MK-II employs real balanced input and output connections, not merely single-ended circuits terminated with XLR connectors.
This distinction matters because the physical appearance of an XLR socket does not, by itself, establish how the signal is handled internally.
Balanced analogue interfaces can offer practical advantages in suitable systems, particularly where appropriate source and amplifier connections are available.
Actual performance depends on the complete equipment combination, cable installation and grounding conditions.
Five Stereo Analogue Inputs
The Canary Audio C1800 MK-II provides a versatile selection of line-level analogue inputs:
3 stereo pairs of single-ended inputs
2 stereo pairs of balanced inputs
This arrangement allows a combination of compatible analogue sources to remain connected to the preamplifier.
Typical applications include premium DACs, CD players, network streamers with analogue outputs and external phono stages.
The C1800 MK-II is a line-level preamplifier. Its published specifications do not describe an integrated MM/MC phono stage or digital-to-analogue converter.
Balanced and Single-Ended Outputs
On the output side, the C1800 MK-II offers:
1 stereo pair of single-ended outputs
1 stereo pair of balanced outputs
These connections provide flexibility when matching the preamplifier with compatible stereo power amplifiers or monoblock amplifiers.
The choice of output should be based on the receiving amplifier’s electrical specifications and the complete system configuration.
Four-Tube Vacuum Tube Line Stage
The audio circuit of the Canary Audio C1800 MK-II uses four small-signal vacuum tubes:
2 × 12AX7 dual-triode valves
2 × 12AU7 dual-triode valves
These established tube types form the core of Canary Audio’s low-noise line amplification architecture.
The 12AX7 and 12AU7 have different electrical characteristics, providing the amplifier designer with suitable options for signal amplification and related line-stage functions.
The final operating behaviour is determined by Canary Audio’s complete circuit implementation.
Separate External Vacuum Tube Power Supply
The C1800 MK-II uses a matching external power supply chassis rather than placing the entire supply transformer assembly beside the sensitive line amplification electronics.
Separating the power supply from the audio stage helps reduce potential exposure to magnetic interference associated with the power transformer.
This arrangement is particularly valuable in a dedicated high-end line preamplifier, where preserving low-level signal integrity is a central design objective.
The external supply contains four vacuum tubes:
1 × GZ34 / 5AR4 rectifier tube
2 × 6V6 power supply tubes
1 × 6SL7 power supply tube
The GZ34 provides vacuum tube rectification, while the remaining valves form part of the broader power supply circuitry.
Double-Choke High-Voltage Filtering
Canary Audio employs two filtering chokes within the C1800 MK-II power supply.
Chokes are inductive components used to smooth electrical supplies and help manage unwanted ripple after rectification.
This filtering architecture is combined with the manufacturer’s custom power transformer and tube-based supply circuitry.
The objective is to support stable operating conditions for the separate vacuum tube line stage.
Custom EI Power Transformer
The external supply uses a custom-wound EI power transformer designed for the electrical requirements of the C1800 MK-II.
Transformer selection and physical installation are important aspects of vacuum tube equipment design.
The dedicated transformer and separate chassis reflect Canary Audio’s emphasis on specialised analogue power supply engineering.
Swiss ELMA Hand-Built Stepped Attenuator
The C1800 MK-II features a Swiss-made ELMA stepped attenuator with gold-plated contacts.
According to Canary Audio, the attenuator is hand-built by the company’s engineers.
A stepped attenuator provides discrete volume positions rather than the continuously variable operation associated with a conventional potentiometer.
Its precise mechanical design and carefully selected contact materials form part of the preamplifier’s premium control architecture.
Important: The official MK-II specification lists the ELMA stepped attenuator. It does not establish that the remote-controlled motorised attenuator offered on the earlier C1800 is included as standard on the MK-II.
Swiss-Made ELMA Input Selector
In addition to the volume attenuator, Canary Audio specifies precision ELMA selector switches with gold-plated contacts.
Reliable signal selection is an important requirement in a high-end preamplifier serving several analogue sources.
The combination of precision switching and stepped volume control contributes to the C1800 MK-II’s specialist component design.
C1800 Series Internal Construction
The following image comes from the existing Chameleon Audio C1800 product gallery and illustrates the internal construction of the C1800 series.
Illustrative C1800-series photograph. The final C1800 MK-II production version may differ in its input, output and attenuation circuitry.
Wide Frequency Response: 5Hz to 125kHz
Canary Audio publishes a frequency response of 5Hz to 125kHz, ±1dB for the C1800 MK-II.
The specified bandwidth extends beyond the audible frequency range and illustrates the manufacturer’s electrical design objectives.
This should be understood as a published electrical specification, not a guarantee of equivalent acoustic response from an entire playback system.
10.4dB Maximum Gain
The C1800 MK-II offers 10.4dB maximum gain, according to the manufacturer’s technical data.
This specification is useful when planning system gain with high-output DACs, CD players and sensitive power amplifiers.
Correct system matching should consider the output voltage of the source, input sensitivity of the power amplifier and the desired range of volume control.
1,200-Ohm Output Impedance
The published output impedance is 1,200 ohms.
This figure should be considered when selecting a power amplifier and interconnect cables.
A common starting principle is to choose a receiving amplifier with input impedance considerably higher than the source component’s output impedance.
Actual compatibility depends on the selected connection, cable characteristics and amplifier input circuitry.
Exceptional Published Distortion Performance
Canary Audio specifies total harmonic distortion of less than 0.01% for the C1800 MK-II.
The manufacturer also lists hum and noise at -73dB and maximum output voltage before clipping at 45V.
These figures should be read as manufacturer-published specifications, with the measurement conditions not fully detailed on the product page.
Advanced Power-On Control
The MK-II includes an integrated power control circuit with illuminated pushbutton ON/OFF switches.
This provides a coordinated interface for the dedicated line-stage and power-supply architecture.
Installation and switching procedures should always follow the manufacturer’s operating guidance.
Additional C1800 Series Construction Detail
The following second photograph is retained from the existing C1800 gallery and provides an additional view of the series’ premium mechanical construction.
C1800-series image. Confirm the final MK-II appearance and rear-panel configuration against the supplied unit.
Black or Champagne Gold Finish
Canary Audio lists the C1800 MK-II with a choice of black or champagne gold anodised faceplates.
The finish should be confirmed at the time of ordering, along with the exact production configuration and availability.
Recognised by Stereo Times
The Canary Audio C1800 MK-II was recognised by Stereo Times Senior Editor Key Kim in the publication’s 2020 Most Wanted Components Awards, together with the Canary Audio M350.
This recognition is specifically associated with the C1800 MK-II and M350, rather than the earlier C1800 model.
Although the two models share a substantial amount of their vacuum tube and power supply architecture, the C1800 MK-II introduces important practical changes.
The original C1800 offers four stereo single-ended inputs and two stereo single-ended output pairs.
The MK-II replaces this with three stereo single-ended inputs, two stereo balanced inputs, one stereo single-ended output pair and one stereo balanced output pair.
The updated model also introduces a Swiss ELMA stepped attenuator that is specifically documented as hand-built by Canary Audio engineers.
These changes make the MK-II the more relevant option for listeners seeking genuine balanced connectivity within a dedicated vacuum tube preamplifier.
System Matching with Canary Audio Power Amplifiers
The C1800 MK-II is designed to partner with suitable stereo power amplifiers or monoblock amplifiers.
Selection should consider gain, input sensitivity, input impedance, preferred connection type and loudspeaker requirements.
Canary Audio C1800 MK-II Key Features
Reference-grade two-chassis vacuum tube line preamplifier
Genuine balanced analogue input and output connections
Three stereo single-ended analogue inputs
Two stereo balanced analogue inputs
One stereo single-ended analogue output pair
One stereo balanced analogue output pair
2 × 12AX7 vacuum tubes in the line stage
2 × 12AU7 vacuum tubes in the line stage
Separate external vacuum tube power supply
1 × GZ34 rectifier tube
2 × 6V6 and 1 × 6SL7 power supply tubes
Double-choke power supply filtering
Custom EI power transformer
Swiss ELMA input selectors with gold-plated contacts
Swiss ELMA stepped volume attenuator, hand-built by Canary Audio engineers
Illuminated pushbutton power controls
10.4dB maximum gain
5Hz–125kHz frequency response, ±1dB
Less than 0.01% manufacturer-rated THD
Black or champagne gold anodised faceplates
Stereo Times 2020 Most Wanted Components recognition with M350
Canary Audio C1800 MK-II Technical Specifications
Manufacturer
Canary Audio
Model
C1800 MK-II
Product Type
Two-Chassis Vacuum Tube Line Preamplifier
Balanced Connectivity
True Balanced Inputs and Outputs
Single-Ended Inputs
3 Stereo Pairs
Balanced Inputs
2 Stereo Pairs
Single-Ended Outputs
1 Stereo Pair
Balanced Outputs
1 Stereo Pair
Line Stage Tubes
2 × 12AX7, 2 × 12AU7
Power Supply Tubes
1 × GZ34, 2 × 6V6, 1 × 6SL7
Total Tube Count
8 Vacuum Tubes
Volume Control
Hand-Built Swiss ELMA Stepped Attenuator
Power Supply Filter
Double Choke
Power Transformer
Custom EI Design
Input Impedance
45kΩ Minimum / 110kΩ Maximum
Output Impedance
1,200Ω
Maximum Gain
10.4dB
Frequency Response
5Hz–125kHz, ±1dB
Hum and Noise
-73dB, Manufacturer Specification
Maximum Output Before Clipping
45V
Total Harmonic Distortion
Less Than 0.01%
Power Consumption
70W, Manufacturer Rating
Line Stage Dimensions
18.75 × 14 × 5.25 inches (W × D × H)
Power Supply Dimensions
18.75 × 12.5 × 5.25 inches (W × D × H)
Line Stage Net Weight
26lb / Approx. 11.8kg
Power Supply Net Weight
33lb / Approx. 15kg
Finish Options
Black or Champagne Gold
Published Manufacturer Warranty
2 Years Parts and Labour; Local Terms Apply
Specifications refer to the Canary Audio C1800 MK-II and are subject to production changes. The figures describe a preamplifier; 70W is electrical power consumption, not audio output power. Confirm the exact supplied configuration, current warranty terms and appearance before ordering.
It is a reference-grade two-chassis vacuum tube line preamplifier with true balanced and single-ended analogue connections.
What changed from the original C1800?
The MK-II adds genuine balanced inputs and outputs, revises the available analogue connections and includes a hand-built Swiss ELMA stepped attenuator.
Are the balanced connections genuine?
Yes. Canary Audio explicitly states that the balanced inputs and outputs are true balanced interfaces rather than conventional single-ended connections fitted with XLR sockets.
How many inputs does the C1800 MK-II have?
It provides three stereo single-ended input pairs and two stereo balanced input pairs.
How many outputs are provided?
One stereo single-ended output pair and one stereo balanced output pair.
Which vacuum tubes are used in the line stage?
Two 12AX7 and two 12AU7 tubes.
Which tubes are used in the external power supply?
One GZ34, two 6V6 and one 6SL7.
Why does the C1800 MK-II have two chassis?
The dedicated external power supply helps physically separate transformer-related magnetic fields and power circuitry from the sensitive analogue line stage.
Does it have a stepped attenuator?
Yes. The manufacturer specifies a hand-built Swiss ELMA stepped volume attenuator with gold-plated contacts.
Does the MK-II include remote control?
The official MK-II specification does not identify remote operation as a standard feature. Confirm any available options before ordering.
What is the maximum gain?
10.4dB, according to Canary Audio.
What is the output impedance?
1,200 ohms. Power amplifier matching should take this figure into account.
Does it have a built-in phono stage?
No MM/MC phono input is specified. A compatible external phono stage is required for a conventional turntable connection.
Does it include a DAC?
No. The C1800 MK-II is an analogue line preamplifier.
Does it deliver 70W audio output?
No. The published 70W figure refers to electrical power consumption, not amplified loudspeaker output power.
Is the C1800 MK-II an award-winning product?
Canary Audio states that the C1800 MK-II and M350 combination received recognition in the 2020 Stereo Times Most Wanted Components Awards.
What finishes are available?
Black and champagne gold anodised faceplates are listed by the manufacturer.
Is the C1800 MK-II available internationally?
Contact Chameleon Audio for current availability, selected configuration and international delivery options.
Why Choose the Canary Audio C1800 MK-II?
The Canary Audio C1800 MK-II Two-Chassis Tube Preamplifier offers a compelling combination of traditional vacuum tube amplification and modern, genuinely balanced analogue connectivity.
Its separate tube-regulated power supply architecture, four-tube line stage, precision ELMA controls and carefully developed circuitry make it a distinctive option for serious high-end stereo systems.
For enthusiasts choosing a dedicated preamplifier to partner with premium stereo or monoblock power amplifiers, the C1800 MK-II combines specialist engineering with practical source flexibility.
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