OTO SE
35th Anniversary Edition

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To mark the 35th Anniversary of its introduction, we have introduced a new updated version of the classic OTO SE amplifier range.

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Originally conceived by Peter Qvortrup and designed by Andy Grove, the Oto was the first amplifier to be fully developed and manufactured by Audio Note (UK). While the Audio Note name was already famous, thanks to the legendary Ongaku integrated amplifier, the Oto proved that the company’s expertise with valve electronics could be successfully applied at a more accessible price level.
 

Over the last three decades, the design of the Oto SE has undergone various small evolutions, but this time, Lead Designer Andy Grove decided it was time to give the Oto SE a complete makeover. The result is an amplifier with a more realistic 'bass kick', the kind of physical presence you feel when you are in the room with a kick drum or a bass guitar. It remains an all-round musical, fun-to-live-with amplifier, but it can now summon a serious amount of attitude when the recording demands it.

 

The refreshed Oto SE has a new output transformer designed specifically for the amplifier and wound in-house. The main PSU has been redesigned, now including a choke (also in-house designed and made), with optimised time constants, along with some refinements to the power amp board.

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The phono stage has also been improved, increasing its sensitivity and, together with the new power amplifier board, it means the additional line stage that was necessary in the old Phono version can be removed. This retains phase integrity and reduces noise.

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The wiring loom and internal shielding have also been revised which, together with the new PSU and in-house designed and manufactured mains transformer, have yielded significant improvements everywhere.

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The OTO SE Integrated Amplifier is Level 2, Pure Class A, Parallel Single Ended design, producing an outstanding level of performance.

Available in Line and Phono versions (with an onboard valve MM RIAA stage).

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​Part selection is optimised to realise the most neutral and realistic sonic reproduction.

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

Audio Note (UK) in-house made tinfoil signal capacitors, used in the most critical areas.

Audio Note (UK) custom Standard and Seiryu electrolytic capacitors used in critical areas.

Audio Note (UK) Tantalum resistors used in critical areas.

Audio Note (UK) custom in-house designed and wound BA C Core mains transformer and choke power supply.

Audio Note (UK) custom in-house designed and wound M6 Lamination output transformers.

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

Improved selector switches and internal cabling​

Audio Note (UK) in-house made copper foil signal capacitors, used in the most critical areas.

Audio Note (UK) Standard and Seiryu electrolytic capacitors used in critical areas.

Audio Note (UK) Tantalum and Niobium resistors used in critical areas.

Audio Note (UK) custom in-house designed and wound BA C Core mains transformer and choke power supply.

Audio Note (UK) custom in-house designed and wound I HiB core output transformers.

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

Improved selector switches and internal cabling

Audio Note (UK) in-house made copper foil signal capacitors, used in the most critical areas.

Audio Note (UK) Standard, Seiryu and Kaisei electrolytic capacitors used in critical areas.

Audio Note (UK) Non-magnetic Tantalum and Silver Niobium resistors used in the most critical areas.

Audio Note (UK) custom in-house designed and wound I HiB Core mains transformer and choke power supply.

Audio Note (UK) custom in-house designed and wound S HiB core output transformers.

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