Aelius II
Push-pull hybrid mono power amplifier
Two gain stages, no overall feedback and a balanced input transformer: transparency with real-world drive.
| Aelius II, standard (pair) | €35.000 |
| Aelius II, Silver Edition (pair) | €52.500 |
Prices including 21% VAT · mono amplifiers priced per pair.
Available exclusively through authorised dealers.
About the Aelius II
Aelius II is a push-pull hybrid monoblock power amplifier with only two gain stages and no overall feedback, delivering the power to drive real-world loudspeakers with exceptional transparency and musical involvement.
The first gain stage is a valve operated in single-ended class A, transformer-coupled to the output stage. Using a transformer avoids an extra gain stage, preserving the purity of the signal. The wide-bandwidth (10 Hz – 75 kHz) transformer was developed through extensive listening tests and measurements, and it defines the bandwidth of the amplifier.
New in Aelius II is an input transformer that extends the purity of the signal path even further and provides a balanced input, making longer interconnects possible.
The output stage uses N-channel devices of the same polarity in the same topology. The output is symmetrical, so both speaker terminals carry signal in opposite phase. The power supply uses high-current inductors for smooth, quiet filtering.
Highlights
- Two gain stages, no overall feedback
- Single-ended class A valve input stage, transformer-coupled
- New balanced input transformer
- Symmetrical N-channel output stage
Specifications
| Output power before clipping | 200 W rms @ 8 Ω · 350 W rms @ 4 Ω |
|---|---|
| Bandwidth | 11 Hz – 75 kHz (−3 dB) |
| Output impedance | 0.25 Ω |
| Input impedance | 47 kΩ |
| Gain | ×30 (29.5 dB) |
| Inputs | Balanced |
| Power consumption | 250 W at idle |
| Dimensions (W × D × H) | 425 × 425 × 230 mm |
| Weight | 45 kg each |
Reviews & press
- VideoYpsilon ElectronicsAelius II video
- PDFThe Audio BeatAelius mono amplifiers (first generation)
- PDFStereophileAelius (first generation)
- PDFHaute FidélitéAelius with PST 100 MKII (French)
- PDFAudio MagazineAelius with PST 100 MKII
Reviews open on the publisher's website or as a PDF reprint. Some cover an earlier generation, as noted.