SPECIFICATIONS

Bluetooth: No

Body Material: Metal

Brand Name: FENGRU

Built-in Battery: Yes

Certification: NONE

DSD (Direct Stream Digital): No

Dimensions (WxHxD): 80mm*58mm*24mm

High-concerned chemical: None

Input Type: LINE IN (AUDIO IN)

Model Number: AD3,S105

Operational Amplifier Chips Model: LM4562

Origin: Mainland China

Output Type: LINE OUT (AUDIO OUT)

Output Voltage: 850mW

PCM: No

Package: No

Recommended Headphone Maximum Impedance: 251 - 300 Ohm

Signal To Noise Ratio: 95dB

Type: Mini Amplifier

WIFI: No

Suitable Headphone Impedance

Designed to handle headphones with a maximum impedance of 251-300 Ohm, ensuring optimal sound quality.

Portable Design

The Zishan AD III AD3 OCL is a compact, portable headphone amplifier, perfect for music lovers on the go.

Versatile Input Type

With LINE IN (AUDIO IN) capability, this amplifier can connect to various audio sources for versatile listening.

Rechargeable Battery

Equipped with a built-in battery, this amplifier ensures uninterrupted audio enjoyment wherever you are.

High-Quality Materials

Crafted from durable metal, this amplifier combines longevity with sleek aesthetics.

Zishan AD III AD3 OCL Portable Rechargeable Tube Bile Tube Amp Class A Headphone Amplifier

The new AD III OCL, tube interchangeable amp amp, is currently a mini portable amp amp on the market.

The latest improved version of AD III OCL 04, improves the reliability of the output relay.

AD III OCL version

The circuit structure is a double three-stage tube, common cathode amplification plus op amp buffer output. The electronic tube and the op amp are indispensable under working conditions. Both the electronic tube and the op amp are involved in the amplification work.

The AD III OCL sound-to-noise ratio is quite good, reaching a level comparable to traditional pure integrated IC portable amps.

AD III OCL bile amp, the circuit structure is straight-coupled output, straight-coupled output can reduce the impact of the output DC blocking electrolytic capacitor on the sound quality, reduce the electrolytic capacitor staining of the sound quality and excessive artificial modification. The sound quality is more pure, transparent and natural.

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

Second, electronic components

1. The resistors used in the machine are all VISHAY wafer cylindrical resistors to ensure sound quality. The low temperature drift is 0.5%.
2. Volume control potentiometer, 09 type potentiometer.
3. Input coupling capacitor, Italian AV, Promise special capacitor
4. Power filter capacitor, Philips BC
5. This machine adopts an imported fever 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. The tone is clear and transparent, delicate and round, and the music is full of flavor.

The op amp adopts LM4562, of course, you can also replace and upgrade the op amp IC you like or more. Replacing the op amp IC by itself can allow 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 mid to high frequencies, powerful low frequencies, good separation and dynamics. Actually only know after hearing it.

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

When charging the phone, just use the 5V charger of the mobile phone. Full charge is about 4 hours, and the working life of the amp is about 5 hours. Support to listen and use while charging.

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

Item Pictures: