LM-34IA - Receiver Line Magnetic - Free user manual and instructions
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| Product Type | Integrated Tube Amplifier |
| Brand | Line Magnetic |
| Model | LM-34IA |
| Category | Stereo Receiver |
| Power Output | 2 x 34W (EL34 tubes, ultra-linear) |
| Frequency Response | 20 Hz - 20 kHz ±0.5 dB |
| Total Harmonic Distortion (THD) | < 1% at rated output |
| Signal-to-Noise Ratio | ≥ 90 dB |
| Input Sensitivity | 200 mV (line) |
| Input Impedance | 100 kΩ (line) |
| Speaker Impedance | 4, 8 Ω |
| Inputs | 4 x RCA (AUX, CD, Tuner, Tape), 1 x RCA (Phono MM) |
| Outputs | 1 x RCA (Tape out), 1 x 6.35mm headphone |
| Tube Complement | 4 x EL34, 3 x 12AX7, 2 x 12AU7 |
| Dimensions (W x D x H) | 430 x 350 x 180 mm |
| Weight | 20 kg |
| Power Supply | AC 220-240V, 50/60 Hz |
| Power Consumption | 300 W |
| Material | Aluminum chassis, steel chassis, wood side panels |
| Color | Silver / Black |
| Remote Control | No (manual control) |
| Phono Stage | Yes (MM) |
| Bias Adjustment | Manual bias, adjustable per tube |
| Protection Circuits | Overload, short circuit, tube fault |
| Accessories | Power cable, user manual |
Frequently Asked Questions - LM-34IA Line Magnetic
What tubes does the LM-34IA use?
The LM-34IA uses four EL34 power tubes and five preamp tubes: three 12AX7 and two 12AU7.
How do I bias the tubes?
Biasing is manual. Use a multimeter to measure voltage across test points (see manual). Each tube has an individual bias pot. Adjust to recommended value (typically 35-40 mA).
Can I use the LM-34IA with 4 ohm speakers?
Yes, the amplifier supports both 4 and 8 ohm speakers. Use the corresponding speaker terminals on the rear panel.
What is the power output?
The LM-34IA delivers 2 x 34 watts RMS in ultra-linear mode, sufficient for most high-efficiency loudspeakers.
Does it have a headphone output?
Yes, there is a 6.35mm headphone jack on the front panel.
How do I clean the amplifier?
Disconnect power. Use a soft dry cloth. Avoid liquids. For tube pins, use contact cleaner. Do not open the chassis.
What is the phono input specification?
The phono input is for Moving Magnet (MM) cartridges only, with a sensitivity of 3.5 mV and 47 kΩ load.
Can I replace the tubes with different types?
You can substitute EL34 with 6CA7 or KT77 (with possible bias re-adjustment). Preamp tubes can be swapped with similar 12AX7/12AU7 variants.
What is the warranty period?
Line Magnetic typically offers a 1-year warranty from date of purchase. Check with your dealer for local policy.
How do I connect a subwoofer?
This amplifier does not have a dedicated subwoofer output. Use the Tape Out or speaker-level inputs on a powered subwoofer.
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