ZiShan AD3 AD OCL Portable Op amp bile 6021 tube HiFi HD650 HD600 k701 Class A for earphone headphone

AD III OCL, the tube can be exchanged for the op amp
The latest and improved version of AD III OCL 04 has improved the reliability of output relays.

AD III OCL version, the circuit structure is a double triode, common cathode amplifier plus op amp buffer output. Electronic tubes and ops are indispensable under working conditions. Both the tube and the op amp are involved in the amplification.

The power supply voltage of the bile duct part of this machine is up to 30V, and the BC100UF filter pond. Operational amplifier power supply voltage +/- 12V, 220UF filter pond.

Second, electronic components
1. All the resistors used in the machine are VISHAY wafer cylindrical resistors that guarantee sound quality. The low temperature drift is 0.5%.
2. Volume control potentiometer, type 09 potentiometer.
3. Input coupling capacitor, Italian AV, special capacitor for non-polar audio
4. Power filter capacitor, Philips BC
5. This machine adopts an imported SYLVANIA 6021 double tertiary tube to amplify the signal. The internal resistance of the tube is very low, the amplification linearity is ideal, and the service life is long. Its timbre is clear and transparent, delicate and round, and has a strong musical appeal.

The op amp uses LM4562, of course, you can also replace and upgrade the op amp IC you like or better. Changing the op amp IC by oneself allows users to improve the playability and fun of the machine and the sound quality of better performance.

The pure Class A single-ended circuit is simple but the sound is extraordinary. Sound characteristics: warm, transparent in the middle and high frequencies, strong in the low frequencies, good separation and dynamics. In fact, you only know it after you have heard it.

Class A single-ended sound is noble and charming, has a strong musical taste, has excellent performance of low distortion and wide frequency response, warm vocals, rich details, strong bass and large dynamic range

You only need to use the mobile phone 5V charger when charging the phone. It is fully charged for about 4 hours, and the working life of the amp is about 5 hours. It supports listening and using while charging.

Basic parameters:
Battery life---------------------------about 5 hours 32 Euro
Frequency response range----------------------20HZ--42KHZ
TND----------------------------%0.015 1khz
S/N ----------------------------95dB
Output----------------------------850mW
Load range----------------------16Ω / 400Ω
Measurements ----------------------83*57.*24 (without knob)
Charging----------------------------5V1A
Configuration----------------------------The machine is equipped with one AD III OCL machine, one 12CM pair recording line, one USB charging line, Two straps.