LM-34IA Vacuum Tube Integrated Amplifier
- Amplifier Type: Vacuum Tube Integrated Amplifier
- Circuit Design: Push‑Pull Class‑AB
- Power Output: 40 W + 40 W
- Tube Complement: 2 × 12AX7, 2 × 12AU7, 4 × EL34
- Output Transformer: Custom‑Wound Output Transformer
- Analog Inputs & Outputs: 1 × Pre‑In (RCA, L/R), 3 × Line‑In (RCA, L/R)
- Speaker Outputs: 2‑Channel Stereo (L/R), 5‑Way Binding Posts
- Taps Per Channel: 0 Ω (Common/GND), 4 Ω, 8 Ω
- Operation & Control: Remote Controllable
Import Duties & Taxes
Orders shipped to the US and Canada are delivered on DDP (Delivered Duty Paid) basis. All import duties, sales taxes and customs clearance fees are included in your checkout total. No extra customs charges will apply upon receipt of your package.
Tax & Duty Included for Selected Regions
Orders delivered to the United States and Canada are shipped on DDP (Delivered Duty Paid) terms. Import duties, sales taxes and customs clearance fees are fully included in your order total at checkout. You will not receive any additional customs charges when receiving the package.
LM-34IA Vacuum Tube Integrated Amplifier
Rich Sonic Texture, Versatile Musicality
The Line Magnetic LM-34IA brings rich, versatile tube sound to your system. Enjoy classic EL34 warmth, or shape your ideal tone with a wide range of compatible tube types — all in one unit. It pairs with almost any speaker, works as a standalone power amp for easy upgrades, and features simple user-adjustable bias controls for hassle-free maintenance. Classic tube craftsmanship, built for everyday listening and long-term flexibility.
Electronic Specifications
- Power Output: 40 W + 40 W
- Frequency Response: 10 Hz – 60 kHz (-1.5 dB)
- THD: 1% (1 kHz)
- S/N Ratio: 88 dB
- Input Sensitivity: Line: 300mV, Pre In: 1.5V
- Input Impedance: 100 kΩ
- Output Impedance: 4 Ω, 8 Ω
- Power Requirements: AC 115 V/120 V/220 V/230 V/240 V ±5% (50 Hz / 60 Hz)
- Tube Complement: 2 × 12AX7, 2 × 12AU7, 4 × EL34
- Power Consumption: 230 W
- Working Conditions: Temperature: 0 ℃ – 40 ℃; Moisture: 20% – 80%
- Storage Conditions: Temperature: -20 ℃ – 70 ℃; Moisture: 20% – 90%
Weights & Dimensions
- Dimensions (W × D × H): 376 mm × 345 mm × 191.5 mm (14.80" × 13.58" × 7.54")
- Net Weight: 20 kg (44.09 lb)
Application
- Daily leisure: Vinyl records, Hi‑Fi music appreciation, background listening
- Home audio: High‑fidelity home listening room, dedicated audio corner
- Audiophile session: Music appreciation gatherings, record sharing parties
- Work & creation: Music production evaluation, audio tone reference
- Relaxation time: Late‑night listening, quiet immersive music enjoyment
Design
- Type: Vacuum‑tube integrated amplifier
- Chassis: Sturdy metal chassis, classic retro layout
- Transformer: Hand‑wound EI output & power transformers
- Tube complement: Swappable vacuum tube sockets
- Construction: Point‑to‑point hand‑wired build
- Finish: Brushed metal
Analog Inputs & Outputs
- 1 × Pre‑in (RCA, L/R)
- 3 × Line‑in (RCA, L/R)
Speaker Outputs
- 2‑channel stereo (Left / Right), 5‑way binding posts
- Taps per channel: 0 Ω (Common/GND), 4 Ω, 8 Ω
One‑year warranty for the complete unit, and six‑month warranty for vacuum tubes.
Products purchased online or from authorized local dealers and still within the warranty period are eligible for warranty service upon presentation of a valid purchase receipt.Purchases made from unauthorized dealers are NOT eligible for warranty service.
Call us: (+852) 8480 1098
Email : info@lm-audio.com
40W‑Per‑Channel Class‑AB Push‑Pull, EL34 Output Tubes
Featuring a mature Class AB push pull circuit topology with 40W output per channel, this amplifier achieves an ideal balance of power headroom, distortion suppression and authentic tube charm. Factory fitted with EL34 output tubes and 12AX7 / 12AU7 preamp tubes, it delivers naturally rich midrange, tight and well defined bass, and delicate transparent treble for an immersive listening experience.
High Playability with Direct Compatibility for Multiple Output Tube Types
Enjoy flexible tube rolling without any circuit modification or internal adjustments. Apart from the factory fitted EL34 output tubes, the unit supports a wide range of power tubes including KT66, KT70, KT90, KT100 and 6550. Calibrate the bias after tube replacement to maintain vacuum tubes at their optimal operating point. It delivers varied tonal signatures — warm vintage character or powerful dynamics — letting you tailor the sound to your listening preferences.
Custom-Built EI Transformer System
As the acoustic foundation of the amplifier, the transformer set is purpose-engineered for stable, low-noise performance:
A high-power-margin EI power transformer delivers clean, consistent power supply across the entire volume range, minimizing background noise and preserving dynamic headroom even during demanding musical passages.
Two wide-bandwidth EI output transformers are precision-wound to match the output characteristics of multiple tube types, ensuring flat frequency response and retaining the unique tonal character of each power tube.
Strictly Screened & Precision Matched Tube Sets
Every tube installed in the LM-34IA undergoes rigorous screening and precision matching before assembly. Both preamp-stage and power-stage tubes are hand-selected to ensure consistent electrical parameters across the left and right channels. This strict matching protocol guarantees uniform channel balance, accurate soundstage imaging and optimal sonic performance, allowing each tube to perform at its full potential.
User Adjustable Bias with Top Panel Visual Monitoring Meter
Built for tube rolling and routine maintenance, this amplifier features user operable bias controls and a dedicated bias monitoring meter on the top panel. Thanks to its intuitive visual design, you can quickly monitor and fine tune the bias after replacing output tubes, keeping each power tube at its optimal operating point for outstanding sound quality and extended tube service life.
Comprehensive Connectivity & Dual-Mode Flexibility
The rear panel features a complete set of connection terminals to accommodate diverse audio systems:
3 pairs of RCA line inputs for connecting multiple source devices
1 pair of Pre-in terminals
Heavy-duty speaker terminals supporting 4Ω and 8Ω loudspeakers
The dedicated Pre-in input allows the LM-34IA to function as a standalone power amplifier when paired with an external preamplifier, adding great flexibility for system upgrades and custom hi-fi setups.
Versatile Sonic Signature for All Music Genres
In its stock EL34 configuration, the LM-34IA delivers a warm, smooth and highly musical presentation with rich midrange texture and well-paced bass response. With support for multiple power tube types, it adapts effortlessly to everything from vocal jazz, classic rock and folk to symphonic classical and modern pop, making it a versatile centerpiece for any home audio system.
