L1969Phone SE pure Class-A amplifier (finished) have a fever Headset amp HD600 K701 can also drive
1969 circuit lap in HIFI popular half a century , is still being talked about old burn , during its own reason . The 1969 amp circuit prototyping using this circuit , the rich even harmonics created a beautiful unique charm , is the stone closest tube amp sound circuitry , and the circuitry for the headphone amplifier , without the amplifier soft feet and the problem of insufficient momentum , Naiting very soft voice , while dynamic sound field are perfect embodiment.
The machine features:
1. Pure class a headphone amplifiers,
2. The power supply part joined the CLC filter, plus 1969 pure circuit of the power of strong adaptability, which USES switch power supply, the machine will have very soft sounds of resistance.
3. The power tube reverse installation, ingenious use of casing heat dissipation, so that in a small achieve large current inside the case (15 v, 180 ma) working point.
4. The material of the unit "and" other, a large number of FM high frequency capacitance, capacitance, chemical coupling use 2.2 uf membrane, output, using the 680 uf FM gold master, import A50K potentiometer, MJE340G tube, and fever.
5. Four MJE340G, the tube good consistency
6. This machine is warm and mellow sound, accidentally rich harmonics,
7. Warm prompt: 1969 circuit to the stability of a few minutes, just on electricity as a heat engine, the machine at room temperature 28 degrees environment work 10 hours, the measured temperature of about 45 degrees, is far lower than the power amplifier.
General parameters :
1. Output power (1KHZ equivalent distortion sine wave power ): 80mW / 300 ohm , 200mW / 120 ohm , 650mW / 32 ohms.
2. SNR :> 98dB.
3. amp resistance : 10 ohms. DC1
4. The voltage amplification gain : 8 times the standard gain mode .
5. The maximum output voltage swing : greater than 12V (DC15V powered ) .
6. Input Interface : RCA audio input.
7. Output Interface: 6.35 headphone output.
8. Input voltage: transformer AC110-220V. DC9-15V ( recommended DC15V)
9. Volume : 100 * 70 * 23.5mm
10. Weight : 120 g .
11.PCB size : 98 * 66mm
Shipping list: amplifiers + 15 v power supply