SMSL G1 OCXO Quad-Channel Master Clock

The SMSL G1 is a master clock generator built around a 10MHz SC-cut OCXO that SMSL calibrates to ±3 ppb, with four BNC outputs to clock several components at once. It's for systems whose DAC, streamer or CD transport has a 10MHz reference clock input.

Who the SMSL G1 is for

• Gear with a 10MHz clock input: It sends a 10MHz square wave (3.3Vp-p) over BNC; SMSL's manual shows it clocking a PL200T CD transport and a D200 DAC.
• Racks with several digital boxes: Four BNC outputs (CH1 to CH4) let one reference feed a transport, a DAC and other clock-capable components at the same time.
• A finishing touch, not a first upgrade: It belongs late in a build, once the DAC, transport, room and power are sorted and at least one component accepts an external clock.
• Owners of an external DC supply: Besides 100–240V AC it runs from 9–15V DC (1A, 5.5 × 2.1mm plug); SMSL says not to connect both at once, and the warm-up countdown shows only on AC.
• Skip it if: your DAC, streamer or transport has no 10MHz reference clock input; the G1 only outputs a 10MHz signal on BNC.

SMSL G1 key specs

• Oscillator: 10MHz SC-cut OCXO, double constant-temperature design
• Frequency accuracy: ±3 ppb, factory-calibrated; within ±3 ppb across temperature
• Clock outputs: 4 × BNC, 10MHz square wave, 3.3Vp-p
• Output impedance: 50/75Ω
• Warm-up: Stable in about 2 minutes; about 10 minutes recommended (countdown shown on AC power)
• Power input: AC 100–240V 50/60Hz, or DC 9–15V 1A (5.5 × 2.1mm plug), not both at once
• Power consumption: 12W while heating; 3W in normal use
• Operating conditions: +5°C to +35°C; 5–85% humidity, non-condensing
• Size and weight: 200 × 47.9 × 186mm (W × H × D); 1.618kg

Genuine SMSL stock, 1-year warranty.