SA-1 Class A Full Balance Headphone Amplifier Preamplifier Assembled Single-Ended Balanced Outputs

SA-1 Class A Full Balance Headphone Amplifier Preamplifier Assembled Single-Ended Balanced Outputs

Description:
SA-1 is a high-performance fully balanced, fully discrete Class A amp/preamp.

Support global voltage AC100V-240V, no need to switch.

Ultra-low distortion: THD+N -120db at 1khz A weighting 20-22khz. When outputting 50mv at low gain, THD+N still has -96db at 1khz A weighting 20-22khz.

Ultra-low noise: When the gain is low, the noise level is 300nv RMS A weighted 20-22khz (tested after amplification by LNA), the direct test value of AP2522 is 0.66uv. At maximum output, SNR and DNR are 147db.

SA-1 adopts true four-way completely independent fully discrete Class A amplifier circuit, pure analog amplifier circuit and pure analog control, without EMI interference caused by digital control, and faithfully restores the analog flavor of music.

The amplifier circuit adopts the class A architecture developed by ourselves. The differential input tube adopts ultra-low noise audio dedicated tube for ROHM, which is manually selected by precise matching to ensure the consistency of the differential tube. For other tubes, we use SMD twin tubes with excellent consistency to ensure better performance.

Final output circuit uses multi-stage current amplification, similar to the architecture of a high-power amplifier. Each channel uses 2 pairs of 4A mid-power tube for ON Semiconductor to output in parallel to ensure low enough internal resistance and strong driving force; it can be calm and unhurried even in large dynamics.

Perfect protections: overcurrent, overload, overheating, short circuit and DC protections, start-up delay, the output relay can be cut off immediately when shutting down.

Multi-function and multiple play methods:
1. Support single-ended balanced input, free switching;
2. Support multi-output interface, XLR 4-pin true balanced, 6.35 single-ended, 4.4 balanced interface; also supports single-ended and balanced output as a preamp mode;
3. Support high and low gain design, you can easily connect various earplugs, super sensitive earplugs, etc. (still can maintain inaudible noise level) when the gain is low; When the gain is high, you can push large headphones, including various high-resistance moving coils, low-resistance flat panels, and even ultra-low sensitivity headphones such as for KK.
4. Support high and low impedance output, suitable for high-impedance headphones when high-impedance, low-impedance headphones that require high current can be pushed; freely switch, you can enjoy powerful driving and controlling sound, you can also try a relaxed and calm simulation taste.

Large balanced output power:
16Ω   10000mW
32Ω   5500mW
68Ω   3100mW
120Ω 2000mW
600Ω 380mW

Single-ended power:
- The corresponding balanced output power divided by four.

SA-1's Class A model:
- Balanced 16-ohm load: below 500mw;
- Balanced 32-ohm load: below 1000mw;
- Balance 68-ohm load: below 3000mw;
- Balance the load above 68 ohms: almost all power is Class A.

SA-1 headphone amplifier gains:
1. Single-ended input, single-ended output: low gain is 0db, high gain is 11db;
2. Single-ended input, balanced output: low gain is 6db, high gain is 17db;
3. Balanced input, single-ended output: low gain is -6db, high gain is 5db;
4. Balanced input, balanced output: low gain is 0db, high gain is 11db.

Size & weight:
- Case size: 234 x 170 x 45mm (Not include the height of the machine feet and the size of the protruding part of the connector on the back of the chassis)
- Machine net weight: 1.8kg

Package Included:
- 1 x Set of Headphone Amp

Note:
- It is assembled.