CAD-300SEI
Single-ended triode valve integrated amplifier that also includes headphone amplification.
Price, selected version, availability and estimated lead time are confirmed individually before any order.
Discuss purchase and listeningCatalogue information verified on the 19 June 2026. Official Cary Audio page.
Summary
The CAD-300SEI is a single-ended class A triode integrated amplifier, which also includes a headphone output, thus appearing in both the integrated amplifiers and headphone amplification sections of the catalogue.
Key Points
- Single-ended triode Class A valve integrated amplifier.
- Incorporates a headphone stage that utilises the amplifier's complete circuitry.
- It features prominently in both integrated amplifiers and headphone amplification within the catalogue.
- Line inputs and headphone input on the panel.
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Purchasing, listening and delivery
Ordering and system matching
Ask about the selected version and matching with your amplifier, sources and room. Supply arrangements will be confirmed in the quotation. An enquiry does not confirm a sale.
Listening sessions and demonstrations
You can request a listening session by appointment at our Barcelona office (Carrer de Modolell, 57). When we arrange the appointment we confirm which equipment is available to hear, along with the date and time.
Home demonstrations are not offered for this product.
Delivery and setup
Delivery, its cost and the estimated timing are confirmed in writing in your quotation, for your delivery address and before you accept it.
Installation and setup can be requested as an additional service. We assess feasibility and quote it separately.
Planning your system
The CAD-300SEI combines preamplification and a Class A single-ended amplifier with 300B output valves. Cary lists 15 W, making speaker sensitivity, impedance, listening distance and desired level useful starting points for system matching. Its headphone output offers another listening option; suitability still depends on the actual load. Include the exact speaker and headphone models in your enquiry.
Editorial Reference
Model context
Position within the Cary range
15 W single-ended triode integrated amplifier in Class A with 300B tubes; officially listed under both integrated amplifiers and headphone amplification.
Why choose this model?
For sensitive speakers or headphone listening when seeking a 15 W SET with a headphone stage that utilises the amplifier's complete circuit.
For which system does it make sense?
- Listen to high-sensitivity speakers with a low-power, high-linearity SET configuration.
- Headphone amplification using the complete integrated circuit.
- Purist low-wattage systems with classic valve character.
Differences compared to similar models
The only Cary integrated amplifier with a 300B SET confirmed in the active catalogue. Significantly less power than the SLI push-pull models, but with a headphone stage officially recognised in a dedicated category.
Architecture and Design Decisions
15 W single-ended triode in Class A with two output 300B tubes and three 6SN7 tubes (one input and two driver). The headphone output utilises the amplifier's complete circuit as per Cary Audio.
Compatibility and Use
Compatible with RC-300. High-sensitivity speakers recommended due to the low power SET. Headphone input on the panel.
Official specification limits
Headphone impedance and speaker outputs not listed on the official web page. Do not compare in power with push-pull integrated amplifiers.
Related Technologies: Valves and single-ended triode .
Technical Specifications
Specifications
- Output power
- 15 W (single-ended triode, Class A)
- Topology
- Single-ended triode (SET) in Class A
- Valves
- Output: 2 × 300B. Input and driver: 3 × 6SN7
- Frequency response
- 20 Hz–23 kHz (±0,75 dB)
- Signal-to-noise ratio
- −90 dB
- Sensitivity
- 0,42 V
Technical Specifications
Connectivity
- Inputs
- Line inputs (CD, AUX1, AUX2)
- Outputs
- Speaker terminals; 6.35 mm headphone output
- Headphones
- Headphone output utilising the amplifier's complete circuit
- Line inputs
- CD, AUX1 and AUX2 (as per manual)
Technical Specifications
Design and Construction
- Dimensions
- 14 × 8 × 14 inches (W × H × D)
- Weight
- 51 lbs
Specifications compiled from official Cary Audio sources, reviewed on 19 June 2026. Unverified data is not published; unavailable fields are omitted.
Documentation
Official Manuals and Resources
Links to PDFs and guides published by Cary Audio on caryaudio.com. They open in a new tab.
- ManualOwner's Manual (CAD-300SEI)
SET Integrated Manual: speakers, headphones, bias, and specifications.
Technologies
Engineering Behind This Equipment
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Valves and single-ended triode
Valve design is the foundational heritage of Cary Audio. The brand maintains a line of triode equipment in single-ended configuration, in class A, which defines much of its character and sonic identity.
Launch context
Origin and Journey
Introduced in 1994; it is the longest-standing model in the current Cary Audio catalogue.
Be part of the CAD Series — Classic Valves.
Recommended Applications
Where it fits
- High fidelity
Integrated Amplifiers. For those seeking a complete and straightforward system: a preamplifier and power amplifier combined into a single unit, requiring only the connection of sources and speakers.
Headphones. For those who appreciate intimate listening with headphones as part of a high-fidelity system.
Within the Cary catalogue
Its position in the range
The CAD-300SEI is part of Integrated Amplifiers and Headphones in the Cary Audio catalogue.
- Families
- Design family
- classic valve design
- Series
- CAD Series — Classic Valves
- Headphones
- Dedicated headphone stage
Reference
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