Line and layout upgrade!
Further improve the signal-to-noise ratio! Increase the magnification adjustment function! 0/9/19 three gears adjustable!
Version A:The 3.5mm jack on the rear panel and the RCA socket are both input ports. After one is connected to the audio source, the other can be connected to an amplifier or active speaker. The power amplifier and active speakers can be used at the same time, and the power amplifier or active speakers will not be affected when the amp is turned off.
Version B:The 3.5mm jack on the rear panel is the signal input port, and the RCA socket is the analog signal output PO port, used to connect to power amplifiers or active speakers. The amp is used as a front-end. After the front panel earphone jack is inserted into the earphone, the rear PO port will automatically When the signal is disconnected, only the earphone produces sound.
See the photo introduction below for details.
There is also a high-profile version【I point】Enter the dedicated link!
The small shop Lehman amp is in place【Lehman dedicated link】
Buyers had complained about power supply problems before. We no longer order finished power supplies. We directly find a local 30-year-old factory to customize transformers for assembly. WISCO''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s silicon steel sheet + pure copper enameled wire is not called or troublesome, the output is stable, and the heat is low.
Novices who are new to the content of this box, please take a look! ! Veteran can skip it. Headphone amplifier is the abbreviation of headphone power amplifier, also called ‘two rooms’. Some high-quality headphones will not be able to achieve full performance due to the low thrust of the audio source equipment, and still can''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t feel the improvement when replaced with a lossless audio source. If it is not for fakes, you need to add an amp to increase the thrust. After adding the amp, the sound field, details, sense of layering, and bass will be improved to varying degrees, depending on the peripheral equipment and music files. It may not be a comprehensive improvement, and some may only be improved on one side. It is recommended to listen to music without loss of sound source, so that the music restoration effect is good, and the earphone is also the key point. Some of them have limited performance, and no matter how to improve it, it is impossible to recover. |
This amp circuit refers to SOLO and Lehman! Mainstream op amp + pair tube follow circuit structure,In-line op amp seat design! Support self-replacement of op amp!The internal integrated linear voltage regulator circuit, working voltage & plusmn; 15V, can fully utilize the sound quality of the op amp. The components are selected from the famous NE5532, which is known as the “op amp emperor”,The sound is full and warm, Excellent midrange bass performance! For the tube, the BD139/BD140 used by many famous amps is used as the power output! Have a good balance and thrust! Push HD650 earphones with a high impedance of 300 ohms, and you only need to turn them halfway to make them sublime!
Performance parameters:
- Supply voltage:AC 15V(DC cannot work, let alone a charger or constant current power supply!)This amp is not a portable machine, there is no battery in it, and it needs a power supply to work.
- Output Power:320mW+320mW(600Ω)1300mW+1300mW(32Ω)When using, please be sure to adjust from a low volume,Amp design! It must not be used as a power amplifier!
- Maximum output voltage swing:±13.8V(27.6V equivalent)
- Amplification gain:Default 19 times(0/9/19 three gears optional)
- Frequency response:2Hz~80KHz
- Total harmonic distortion:<0.002%
- Signal-to-noise ratio:>98dB
- Output impedance:47 euros
- Input terminal:Analog line input(There is an interface introduction picture at the bottom of the page)
- Headphone output:3.5mm×1
- External dimensions:Height 29mm, width 68mm, length 107mm(Length includes screws, not knobs)
- The calorific value is not high, mature design,The quiescent current is not high,Touching the shell in summer is at most warm. After all, it is not Lehman''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s tube circuit. You can use it with confidence. If you need your own power supply, the power of the transformer is not less than 6W.
As there is no clear and definite standard for the sense of hearing and sound quality, different people describe it as inconsistent. These are the evaluations of some buyers. You can directly take a trial and listen, no reason to return the goods for 7 days without trauma! It is recommended to purchase return insurance when placing an order, the return postage will be borne by the insurance company!
In order to ensure that the quality of all the amps is foolproof, this amp is only the finished product! After all debugging and testing are completed, the op amp is personally screened by the store manager! Lifetime after-sales!
The power input voltage is 220V by default, which is the mains voltage in mainland China. You need to change it to 110V and leave a message or tell the customer service when you place an order!
Don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t turn on the sound only a little when listening, it is better to hear the sound louder for normal listening. This amp is suitable for use with 32~600 ohm impedance headphones. If the low impedance is not good enough for listening, you can switch to high impedance headphones, so that its high thrust advantage is easier to play! Don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t study the well-known and easy-to-play stuff like moving irons, and that stuff doesn''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t need amp assistance.
Dear friends! The store is a long-winded sentence here, the power tube in the Class A amp has a static current, and heating is normal, so there is no need to worry about heating, and you can contact the store for after-sales if you don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t worry.
After removing the screw in the middle of the RCA seat and the 4 screws at the four corners of the front panel, the motherboard can be pulled out directly from the front, so that the magnification can be adjusted. There is a group on the left and right sides of the op amp, one group is responsible for one channel, and they must all be adjusted to the same position.
In order to deal with malicious competition among peers, we have to deal with buyers who use evaluation as a bargaining chip. After-sales service, a complete order number must be provided, but the number is not recognized! Any buyer who maliciously evaluates will be blocked, and all after-sale rights will be cancelled.
The exchange shop bears the postage for the new machine, but the old machine needs to be sent back to the store first, and the postage is self-care. Free repairs within 3 months after the receipt, the store will send it back to the buyer free of charge after the repair is completed, and the buyer only bears the postage for the repair. After 3 months, only the cost of the component and the round-trip postage will be paid for the repair, and there is no labor cost. The return postage will not be higher than the single-buy postage. Power supply shipments must also be inspected! If there is a problem, it will be replaced in 7 days! The postage will be paid by both parties.