OTO

The OTO models fulfil all Audio Note (UK) Level 1-2 criteria

• Pure Class A Single Ended Pentode operation
• Materials and component quality

Current models

• OTO Line PP
• OTO PHONO PP
• OTTO Line SE
• OTO Line SE Signature
• OTO Line SE Silver Signature
• OTO Phono SE
• OTO Phono SE Signature
• OTO Phono SE Silver Signature

The OTO PP Integrated Amplifier is Level 1 Pure Class A Push-Pull design, producing an outstanding level of performance. Available in Line and Phono versions (with an onboard valve MM RIAA stage).

The OTO PP models have been specifically engineered for sonic performance rather than technical specification, and fulfil all Audio Note (UK) Level 1 criteria

The output transformers are custom designed and manufactured by Audio Note (UK) and are of extremely high quality, offering outstanding, class-leading performance in today’s world of high performance audio.

Materials and component quality

Some of the superior quality components utilises in the OTO SE include: -

• Audio Note (UK) foil capacitors, used in the most critical areas.
• Dual power supplies and transformers, one for the output stage and one for the remaining circuitry.
• Custom designed output transformers, manufactured by Audio Note (UK). These output transformers – one of the most critical areas of valve amplifier design – allow the OTO SE to produce impressively extended and controlled bass.

Some of the superior quality components utilised in the OTO SE Signature include: -

• Audio Note (UK) Copper foil capacitors used in the most critical areas.
• Audio Note (UK) Tantalum resistors used in the most critical areas.
• Custom designed IHiB output transformers, manufactured by Audio Note (UK). These output transformers - one of the most critical areas of valve amplifier design allow the OTO SE Signature to produce impressively extended and controlled bass.

Some of the superior quality components used in the OTO SE Silver Signature include: -

• Audio Note (UK) Copper foil capacitors used in the most critical areas.
• Audio Note (UK) 1 Watt Ni-Chrome resistors used in the most critical areas.Audio Note (UK) KAISEI NP and KAISEI standard electrolytic capacitors.
• SHiB copper / copper c-core output transformers, custom designed and manufactured in-house by Audio Note (UK). These output transformers – one of the most critical areas of valve amplifier design allow the OTO SE Silver Signature to produce impressively extended and controlled bass.

Engineered with audiophile-grade components — premium drivers, hand-matched crossovers, and a hardwood enclosure tuned for natural decay. Every cabinet is internally braced and damped to suppress resonance below the threshold of audibility.

• Custom 6.5" mid-bass driver with paper-pulp cone for transient accuracy.
• Soft-dome silk tweeter with neodymium motor for airy, fatigue-free highs.
• Point-to-point hand-wired crossover using silver-foil capacitors.
• Bi-wirable terminals plated in pure copper.

Place each speaker on its dedicated stand, toed-in toward the listening position. The hardwood enclosure resonates in concert with the drivers — a deliberate, musical interaction rather than a flaw to be eliminated.

Connect to a quality amplifier using bi-wired speaker cable for the most transparent presentation. Allow 50–100 hours of break-in for the drivers and crossover capacitors to settle into their final voicing.