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ADV BAL OCL full balance tube ear

it was officially released on January.

Circuit Brief

the circuit is designed for Class A loop-free feedback, striving for the most natural unbound sound performance.
The Circuit adopts double three-pole electron tube common negative voltage gain, operational amplifier buf inter-stage buffer, triode current output.

The output end of the circuit is direct even output, removing the output coupling large capacity electrolytic capacitor, avoiding the electrolytic capacitor dyeing the sound quality and too much artificial modification. In addition, the sound quality is purer, transparent and natural.

Ear appearance

panel resolution

Get started quickly

single-ended mode power on. After a few seconds, the two-channel indicator light is on, the signal is connected to 3.5 input socket, and the earphone is connected to 3.5 output.

Parallel Mode power on. Toggle the channel switch BAL / A //, after A few seconds, the four-channel indicator light is on, the mode is switched to A // position, the signal is connected to 3.5 input socket, and the earphone is connected to 3.5 output.

Balance mode power on. Toggle the channel switch BAL / A //, after A few seconds, the four-channel indicator light is on, the mode is switched to BAL position, the signal is connected to 4.4 input socket, and the earphone is connected to 4.4 output.

Physical drawing of internal circuit board

Circuit architecture diagram

Electron Tubes belong to high temperature devices.

When the indoor temperature of the whole machine is 30 degrees, the working shell temperature of the whole machine is about 56 degrees.

The noise ratio of this machine is quite good, reaching the level compared with the traditional pure integrated IC portable ear.

The supply voltage of the bile duct circuit of this machine is 30V, and a relatively high pendulum is obtained on the premise of meeting the linear index.

Operational amplifier supply voltage+/- 12V

Electronic components

1,
resistance used in the machine

VISHAY wafer cylindrical resistance and KOA pottery resistance combination

low temperature drift 0.5%.

2,

volume control potentiometer, quadruple 09C type potentiometer.

3,

input coupling capacitor, italy AV special capacitor for electrodeless audio

4,

imported power filter capacitor

5,

this machine adopts two imported double three-pole fever name tube

three-pole electron tube has low internal resistance, ideal amplification linearity and long service life. Its tone is clear and transparent, delicate and round, and its musical flavor is rich.

Machine with operational amplifier cost-effective LM4562

the transport seat is a plug-in configuration, which can upgrade your favorite operational IC to improve the playability and fun of the machine and better sound quality.

Current output tube is imported anson manager.

Sound features: warm, medium and high frequency transparent, low frequency powerful, good separation and dynamics
class A sounds are noble and charming, with strong musical flavor, excellent performance of low distortion and wide frequency response, warm human voice, rich details, strong and powerful bass, and large dynamic range

Basic parameters:

use function

working mode 1 single-ended Class A mode input and output {3.5 headset socket}
working mode class a parallel mode input and output {3.5 headset socket}
working mode class a balance mode input and output {4.4 earphone socket}

Battery life.
A single-ended Class A model is about8-9 hours
class two parallel mode about4.5 hours
class A balance mode about4.5 hours

four built-in capacity9600mah lithium battery we recommend that you use a charging adapter no less than 5V2.5A for charging. Full for about 4.5 hours, support charging and listening

five local support power Bank function provide5V2A charging output

Frequency Response Range

...

TND--------%0.015 1khz

S/N--------95dB

Output power

Single-ended Class A mode output about900MW (32 euros)

Class A parallel mode output about1350MW (32 euros)

Class A balance mode output about1620MW (32 euros)

output load range----16Ω / 400Ω

Supporting configuration

One complete machine TYPE-C USB one charging cable

Why is there no matching recording line?

It's very simple to play with machines to this extent. By the way, I will give you a line. Will you like it? Besides, different people have different tastes and wiring preferences.

Appearance circumference

length 120mm width 76mm thickness 29mm whole machine weight 350g.

Is there a QQ communication group?
2000 people Q group number: 318059363,146933354.

After-sales warranty method

the whole machine is guaranteed until the Taobao store is closed,

1 No one has removed the machine for damage, freight AA, free maintenance.

2 fragile label damaged (removed) buyer user return freight at your own expense, maintenance costs are charged according to the actual situation..(The Electronic Tube is a vulnerable product with a warranty period of three months. After manual disassembly, the electronic tube does not have a warranty range)