29 In stock
Tube Headphone Amplifier
Headphone Amplifier HIFI with Lehmann OPA2134PA High-grade Aluminum Chassis 16-600 ohms
Model No: WEIA-LM
The sound of this headphone amp with Sennheiser high-impedance headphones is obviously with German national aesthetic orientation, restrained and moderate. The longer you listen, the more you can comprehend its meaning. It's not like some equipment that makes one ear amazing. After the passion, it is either indifferent or fatigued.
It is like a flower bud in the early morning, as the sun rises, from the moment you start to listen, she slowly reveals her beauty. It is an amp that can amplify the characteristics of headphones without changing its style.
(Doesn't include the headphone, the photo only for your information)
1. Japan Chemical LXZ high-frequency low-resistance capacitor; Its core operational amplifier adopts Texas Instruments OPA2134PA.
2. British WELWYN original resistance, 1% accuracy, 50ppm temperature drift, the effect is extremely stable, used in analog circuits, full-frequency balance is meticulous, wide bandwidth, moderate frequency texture, and no impurities in digital circuits Information, sufficient details, all copper pins ensure strong current carrying capacity. The details are rich and very delicate.
3. Japanese high-precision ALPS27 potentiometer, sound channel balance error-free, good hand feeling, long life. American CMC 24K gold-plated RCA terminal, oxidation resistance, low internal resistance, very good transmission performance. Original genuine Swiss Neutrik 6.35 gold-plated headphone socket Nutrick socket.
4. Original TALEMA (or porcupine) audio transformer.
5. The power amplifier transistors BD139-16 BD140-1 is used, which is different from the ordinary ST's ON BD139 140. They have better linearity, better sound quality, obvious effects and better levels.
6. Used high-grade aluminum chassis, solid aluminum knob also feel very good compact.
- Input impedance: 47K ohm;
- Frequency response range: 10Hz(-0.3dB)-35kHz(-1dB)
- Adaptation impedance: 8-600 Ω
- Distortion: <0.001% (6mW/300 ohms)
- SNR: > 95 dB at 0 dB gain (analogue)
- Channel separation: > 90 dB/10 kHz
- Maximum gain: 0 dB, 10 dB, 20 dB (It is adjusted by the switch on the bottom of the unit)
- Output power: 200mW/300 ohms; 400mW/60 ohms
- Input interface: RCA
- Output interface: 6.3mm phone jack interface × 2, RCA interface
- Power consumption: about 10 W
- Operating voltage:. 220V/50Hz
- Size: 280x110x44mm
- Weight: 2.1 kg
Power cord x 1
Diagram circuit for your information
1. First of all, you must understand the correct usage habits of the audio system. When the amp is off, the volume knob is turned to the minimum position, first turn on the sound source, then turn on the amp, and then gradually increase the volume, so as to avoid the impact on the headphones at the moment of turning on.
2. New equipment has a burn-in aging process. It is recommended that the new machine should be burned in. Generally, it can enter a better state in 2 to 3 weeks.
3. Operational amplifier selection: This machine uses OPA2134PA dual operational amplifier. Our circuit board is equipped with op amp sockets, customers can try to replace other dual op amps, but be careful not to plug in the opposite direction.
4. Gain selection: The factory default setting of the amp is 10dB gain. HD650/600 is recommended to be set to 10DB, which is subject to personal hearing. Reminder: It is best to turn off the power when setting the gain and turn off the volume to the minimum.
1.Important: Import duties, taxes and other customs related charges all are not included into shipping cost . Buyers bear all responsibility for all extra charges incurred (if any).
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4.Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound. The shipping rate can be showed at the Checkout page. There are two options for shippig as below.
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You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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1. One year Manufacturer`s limited Warranty for defective items (excluding items damaged and/or misused after receipt). Accessories come with a 3-month warranty.2. Defective items MUST BE reported and returned within the warranty period (with the original packaging, if possible). You must tell us what the defect is and give us your order number. WE DO NOT REPAIR OR REPLACE ITEMS WITH AN EXPIRED WARRANTY. You agree to all of the above-listed policies upon ordering on our store.