A portable Single-Ended Triode for Everyone Everyday
Sassy is designed for every enthusiast and audiophile who enjoy sound of SET amp while demands more portability and practicality. Sassy as 2nd member of portable headphone amplifier (PHA) series has inherits many technologies and advantages developed for PHAntasy, the bigger sibling. One may immediately notice Sassy’s extremely compact and light-weighted ever seen for a tube amplifier. The secret is elimination of output transformer and choice of high efficiency subminiature tube. A newly developed full-discrete solid-state output stage replaces costly output transformers, which is capable of delivering precise and powerful energy into headphones no matter what impedance and sensitivity.
The Heart of Sassy, JAN6418
At the center of Sassy are a pair of JAN6418 tubes, each one responsible for major amplification of left and right channels. JAN6418 is a triode-connected filament type pentode in Sassy. The main amplifier topology is Single-Ended Triode (SET) from input up to voltage gain stage to preserve sound signature of Directed Heated Triode (DHT) followed by solid-state output buffer. A triode is unique as gain device that tends to generate more even harmonics than odd ones if any. The result is music sounds airier, smoother, and richer than other type of devices. JAN6418, a directly heated tube, instantly enters working condition after power on and provides intimacy and lifelike sound stage more than none filament type tubes. Hand selected JAN6418 driven by smart filament bias has extensive lifespan. There is no obvious degradation of tube performance for 5 years.
- Frequency Response: 10 Hz – 100 kHz
- Output power: 180 mW + 180 mW (300 ohm); 1000 mW + 1000 mW (30 ohm)
- Headphone impedance: 30 ohm – 600 ohm
- Power supply: 5V/1A via micro USB port
- Operation time (on battery): Approx. 10 hours (depends on headphone impedance)
- Charging time (>1A supply): Approx. 3 hours
- Dimensions: 119 mm x 93 mm x 23 mm
- Net weight: 270 gram