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IGS AUDIO

Thermidt 3530 - Hi-Fi Tube Amplifier

Amplifiers

High-end tube stereo amplifier, Class AB push-pull, 2×32W, 4/8Ω outputs, 10Hz–50kHz response, RCA inputs, bass boost, premium components

$7,125.00 CAD
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Description

The Thermidt 3530 is a high-end stereo tube amplifier created for listeners who value clarity, control, and the natural emotional character of music. Developed in Poland from two decades of audio engineering and critical listening experience, it uses a push-pull Class AB design with fixed bias and a distinctive Negative Cathode Feedback topology. The result is a presentation that combines fine detail and openness with firm, articulate bass and confident dynamics. With 32 watts per channel and dedicated 4-ohm and 8-ohm speaker connections, the 3530 is designed to partner comfortably with a wide range of bookshelf and floor-standing loudspeakers.

Its carefully selected signal path combines 5881 output tubes and 6BL8 driver tubes with Mundorf Silver Oil capacitors, precision Vishay Dale resistors, and custom UTM Industry transformers manufactured locally. Frequency response extends from 10 Hz to 50 kHz within ±1 dB, while a 24-step Swiss-made ELMA attenuator provides precise volume control. Three RCA inputs accommodate sources such as a CD player, DAC, or other line-level component, and a four-position bass control offers flat, +2, +4, or +6 dB adjustment at 100 Hz for tailoring low-frequency response to the room, loudspeakers, or personal preference.

The 3530 is housed in a rigid duralumin chassis manufactured in Silesia, with CNC-machined construction designed to support its substantial transformers and promote effective natural ventilation around the tubes. Gold-plated RCA sockets and robust speaker terminals complete a design intended for straightforward daily use and long-term reliability. Optional Bluetooth connectivity based on the QCC5125 platform adds support for formats including LDAC, aptX HD, aptX LL, aptX, SBC, and AAC, allowing the Thermidt 3530 to combine traditional tube amplification with convenient modern sources.

Features

High-End Tube Amplification
Delivers a refined, natural sound designed for serious music listening and high-end audio systems.

Negative Cathode Feedback Design
Provides excellent clarity, fast response, controlled bass, and stable performance while preserving the natural character of recordings.

Dynamic and Open Sound
Reproduces music with effortless dynamics, spaciousness, and emotional depth across a wide range of recordings.

Versatile Speaker Compatibility
Drives both compact monitors and demanding floor-standing loudspeakers with confidence and control.

Push-Pull Class AB Design
Combines the musical character of tube amplification with strong, dependable power delivery.

Premium Tube Configuration
Uses a carefully selected tube-based power and driver stage designed for detailed, engaging sound reproduction.

Reference-Grade Signal Path
Features premium capacitors and precision resistors selected to maintain signal purity and consistent performance.

Custom Transformers
Purpose-designed power and output transformers support reliable operation, strong current delivery, and high-quality sound.

Precision Volume Control
A premium stepped attenuator provides accurate, repeatable volume adjustment with a reassuring mechanical feel.

Multiple Analog Inputs
Allows easy connection of several audio sources through dedicated RCA inputs.

Adjustable Bass Control
Provides selectable bass enhancement for tailoring low-frequency performance without compromising midrange clarity.

Rigid Metal Chassis
A strong duralumin enclosure provides excellent structural support and helps protect sensitive internal components.

Efficient Natural Cooling
Carefully positioned ventilation promotes airflow around the tubes to support stable operation and long service life.

High-Quality Connections
Gold-plated inputs and robust speaker terminals provide secure, dependable connections for everyday use.

Optional Wireless Connectivity
Can be equipped with Bluetooth functionality for convenient playback from compatible digital devices.

Built for Long-Term Reliability
Industrial-grade components, durable controls, and robust construction are designed to provide dependable performance for years.

Polish Engineering and Craftsmanship
Designed and manufactured with a strong focus on local engineering, precision construction, and lasting quality.

Specifications

General Specifications
Device Type: Stereo tube power amplifier
Amplifier Topology: Push-pull Class AB
Bias Type: Fixed bias
Feedback Topology: Negative Cathode Feedback (NCF)
Output Power: 2 × 32 W
Supported Speaker Impedance: 4 Ω / 8 Ω

Audio Performance
Frequency Response: 10 Hz–50 kHz ±1 dB
Dynamic Range: 98 dB
Signal-to-Noise Ratio: >97 dB
THD: 0.01% @ 1 W, 1 kHz
THD+N: 0.03% @ 1 W, 1 kHz
Harmonic Distortion: Max. 0.15% @ 32 W, 100 Hz
IMD: Max. 0.35% @ 1 W, 1 kHz
Crosstalk: >89 dB @ 1 kHz

Inputs and Outputs
Analog Inputs: 3 × stereo RCA
Input Sensitivity: 0.775 V
Maximum Input Level: 2 V RMS
Speaker Outputs: 4 Ω / 8 Ω
Input Selector: CD / DAC / AUX
RCA Connectors: Gold-plated

Controls
Volume Control: 24-step ELMA attenuator
Tone Control: Flat / +2 dB / +4 dB / +6 dB
Bass Boost Frequency: 100 Hz with shelving below

Tube Configuration
Power Tube Type: 5881
Driver Tube Type: 6BL8 triode-pentode
Driver Tubes: 2 × 6BL8
Custom-Matched Tube Set: Yes

Optional Digital Connectivity
Bluetooth Chipset: Qualcomm QCC5125
Bluetooth Codecs: LDAC / aptX HD / aptX LL / aptX / SBC / AAC
Maximum Digital Audio Resolution: 24-bit / 96 kHz

Electrical
Mains Voltage: 115 V AC / 230 V AC
Mains Frequency: 50 Hz / 60 Hz
Power Consumption: 180 VA

Construction
Chassis Material: Duralumin
Top Plate: CNC-machined
Cooling: Passive ventilation with chimney-effect airflow
Output Transformers: Custom UTM Industry
Power Transformer: Custom UTM Industry
Signal Capacitors: Mundorf Silver Oil
Signal Resistors: Vishay Dale 0.1%

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