SJS Arcadia Model 10 PSE 300B mono power amplifiers

This SJS Arcadia Model 10 power amplifiers are all about pairs. A pair of Premier level mono amplifiers, each using a pair of 300Bs in parallel to provide 20W of audio output power, using a pair of nano-crystalline core interstage and output transformers, and a pair of double C-core power supply chokes.

The Model 10 uses a NOS Sylvania 7N7 input valve to drive a 300B valve used to drive the parallel 300B output valves via an interstage driver transformer. The combination of 300B to drive 300Bs gives an effortless sense of scale, tone and clarity to help bring out the sense of the musical performance.

In common with other SJS Arcadia amplifiers it has been specifically engineered for sonic performance rather than technical specification, and fulfills SJS Electroacoustics primary design criteria:

• Single Ended circuit topology
• Pure Class A operation
• Zero negative feedback
• Valve rectification and choke smoothed HT power supply
• Custom made HT T-network power supply capacitors with silver leads
• Separate mains transformers for HT and filament supplies
• Point-to-point circuit wiring without PCBs
• Star-earth & star-supply wiring
• Hand built
• Real solid wooden frame
• 4mm aluminium panels, black or natural anodized
• Soundcare SuperSpike feet
• Very low noise for use with high efficiency loudspeakers

This Premier version includes:

• Nanocrystalline core output transformers
• Nanocrystalline interstage driver transformers
• Double C-core power supply chokes
• Choke input power supplies
• Fixed bias output valves
• Self-biased driver valve
• Hand made ptfe valve bases
• Duelund CAST DC Silver foil coupling capacitors
• Duelund CAST DC Silver foil bypass capacitors
• Tantalum film resistors
• Pure silver wire for all point to point connections

Delivered with solid walnut frame, black anodised aluminium panels and the dark grey transformer covers can be heard on demonstration at Definitive Audio in Nottingham alongside the rest of the SJS Arcadia range of amplifiers with Living Voice loudspeakers.

UK hi-fi Show Live 2023

Ascot, home of horses, the Royal Enclosure and plenty of bubbles, hosted The UK hi-fi Show Live and we were there for the first public outing of the all new SJS Model 10 mono-block valve amplifiers.

Each mono-block amplifier has parallel single ended 300B output valves for 20W per channel output, using a 7N7 input valve and a third 300B as the driver stage using an interstage driver transformer. These Premier version amplifiers have silver foil coupling capacitors and nano-crystal core interstage and output transformers for a pure and engaging musical performance.

We were delighted to join Definitive Audio showing the Living Voice R80 loudspeakers and the fabulous system featuring both Kuzma Audio XL Air and Grand Prix Audio Monaco v3 turntables with Kuzma tonearm and CAR 60 mc catridges, Consolidated Audio mc step up transformers, and  completed with SJS Model 3 mm phono and Model 4 linestage amplifiers.

It was great to meet everyone who visited us, and very nice to see visitors appreciating the system:

"You can count on Kevin and Lynn Scott from Definitive Audio to put on a good show wherever they appear, and Ascot didn’t disappoint. …As in Munich, the sound was about as natural and musically expressive as one is ever likely to encounter at a HiFi show." 
Eric van Spelde, HiFi Pig

"The new R80 speakers sounded very easy and natural and managed to present a bigger scale with it’s larger mid/bas drivers with very noticeable cymbals/hi hats which sounded exceptional with Jazz recordings."
Naim Community Forum

"Definitive Audio, with a stunning array of top performers on demonstration, such as the Living Voice R80 Loudspeaker and the Kuzma XL Air turntable (to name just two). Definitive Audio drew patrons into their room with ease and grace. As I settled to absorb the various subtle textures and lyrical wonders of Oliver Nelson’s “Stolen Moments” from the vinyl source, I felt the world’s stresses simply drip away. Now this is the mark of a great system. The fact that I could easily ignore the components, cables and interconnects in front of me, listen, reflect and enjoy speaks volumes in respect of all the components being used. Patron Terry Johnson also reflected my thoughts by advising. “This is one of the systems I aspire to own. I can feel the layers of musicians coming through and I just love the organic signature. If I do get to the point where money is no object, I will be giving Definitive Audio a call..!” 
Michael Valentine Studio

SJS Arcadia Model 4 Linestage Preamplifier

 After making its debut at Munich HiEnd 2023, we are very pleased to announce that the SJS Arcadia Model 4 linestage pre-amplifier is now available to order.

The Model 4 has been designed to visually and sonically complement the Model 3 phono and Model 5 power amplifiers.

The Model 4 was launched with the Premier version, which features:

• Custom made silver wound chokes from Consolidated Audio in Berlin
• Duelund Coherent Audio pure silver foil coupling capacitors
• Lundahl power supply chokes
• 6111wa NOS military twin triode valves
• Single Ended circuit topology
• Pure Class A operation
• Zero negative feedback
• NOS Mullard EZ80 valve rectification 
• Choke-input HT power supply
• Custom made HT T-network power supply capacitors with silver leads
• Point-to-point circuit wiring without PCBs
• Hand built
• Real solid wooden frame
• 4mm aluminium panels, black or natural anodized
• Soundcare SuperSpike feet
• PTFE board for component mounting
• Very high quality components throughout
• 8 dB gain
• 5 Hz to 100 kHz -3 dB bandwidth

Each amplifier comes with 2 years parts a labour warranty, except for the valves which have a 6 month warranty.

SJS Arcadia amplifiers are available from Definitive Audio in Nottingham.

Munich HiEnd 2023

We are delighted to have been back at the Munich HiEnd show in Atrium E 220 with Definitive Audio and Bemax Audio.

The system featured SJS Model 3 phono, the new Model 4 linestage pre and Model 5 power amplifiers, with Kuzma XL air and Grand Prix Audio Monaco 3 turntables and showcasing the new Living Voice R80 loudspeakers. 

"The rest of the Living Voice system was quite impressive as well–both Kuzma and Grand Prix Audio analog rigs, SJS amplification with Living Voice and Takatsuki 300Bs, all gathered together in one place to play records. Perhaps that’s why the Living Voice rooms are always so rewarding–there’s always something about this system that radiates a purpose, a feeling that this system was fine tuned toward perfection over decades and not just a few hurried weeks before the show.

The Living Voice R80 loudspeakers truly energized that large and beautiful space, yet still managed to sound light and airy and detailed at the same time. This was another room that was constantly packed throughout the show, and for good reason. Sometimes I forget how special these British loudspeakers are, but I’m already looking forward to next year’s visit in this memorable room."

Part Time Audiophile

"Teamed here with the top-tier SJS electronics (including the new line-stage with curved wooden casing to match what must be the prettiest tube power amp on the market) and the latest (greatest) turntables from Kuzma and Grand Prix Audio, the sound was as bold and engaging as it was effortlessly involving. Kevin Scott’s range of distinctly non-audiophile discs kept things interesting and this room was permanently packed – probably not helped by the comfy bucket seating which, along with the astonishingly entertaining musical performance encouraged the audience to take root. You want the hot-seat? Be prepared to wait – wait some more – and then fight for it…"

Gy8

"this is a pretty serious system but not the most expensive at the event by a long way, yet it provided highly engaging sounds as well as the broadest selection of music with everything from Shostakovich to Scientist dubbing Culture. The system proves that 9 Watts is all you need if the quality is high enough."

The Ear

"The music sounded correct right away, as nothing stood out and everything was well-balanced and natural. String instruments and voices sounded gorgeous, and I found it very easy to concentrate on the music. I could easily hear the family resemblance with the VOX Olympian, one of the best horn systems on the market..........for people looking for that elusive emotional connection with music and not just sound effects, these speakers will give you more than a taste of their vastly more expensive horn offerings."

PSaudio blog

SJS Arcadia Model 8 SE 300B Power Amplifier

This SJS Arcadia Model 8 amplifier is our new single ended 300B stereo amplifier. It has been introduced to sonically and visually complement the Model 6 phono amplifier, Model 7 line stage pre-amplifier and Model 9 step up transformers.

The Model 8 is based on the same circuit design and layout as the Model 5, with NOS Sylvania  7N7 valves used as the input and driver stage, and 300B output valves. Internal components include carbon film resistors and Duelund pure copper foil coupling capacitors.

In common with other SJS Arcadia amplifiers it has been specifically engineered for sonic performance rather than technical specification, and fulfills SJS Electroacoustics primary design criteria:

• Single Ended circuit topology
• Pure Class A operation
• Zero negative feedback
• Valve rectification and choke smoothed HT power supply
• Custom made HT T-network power supply capacitors with silver leads
• Separate mains transformers for HT and filament supplies
• Point-to-point circuit wiring without PCBs
• Star-earth & star-supply wiring
• Hand built
• Aluminium anodised chassis and steel transformer covers
• Soundcare SuperSpike feet
• Very low noise for use with high efficiency loudspeakers

Technical Specifications

Input Impedance	100 kOhm
Input Sensitivity	400 mV for full output
Power Output	8W per channel
Frequency Response	+/-3dB 8 Hz-35 KHz
Valve Compliment	2 x 7N7 2 x 300B 1 x 5U4GB
Max. Power Consumption	250 Watts
Unit Weight	30 kg
Shipping Weight	49 kg (Original Packaging: Customised flight case)
Unit Dimensions	300mm (h) x 450mm (w) x 400mm (d)
Shipping Dimensions	400mm (h) x 545mm (w) x 500mm (d)
	(Original Packaging: Customised flight case)

Delivered with black panels, black anodised aluminium panels and black transformer covers can be heard on demonstration at Definitive Audio in Nottingham alongside the rest of the SJS Arcadia range of amplifiers with Living Voice loudspeakers.

Audio Show Deluxe 2023

After a long winter in the bunker developing new designs, and honing existing ones, it was nice to spend an early spring weekend at Audio Show Deluxe with Definitive Audio and Living Voice.

SJS Model 3 Premier phono, Model 7 Silver Premier line stage and Model 5 Silver Enhanced 300B power amplifiers were partnered with Kuzma and Grand Prix Audio turntables, and showcasing the new Living Voice R80 loudspeakers. 

It was also the first outing for the new Model 8 single ended 300B power amplifier, shown here with natural front panel and antique silver cover, and in the background all in black.

"Kevin Scott used Shostakovich’s terrifying Baba Yaga to hold the audience entranced thanks to a system consisting of Gran Prix Monaco direct drive turntable, Kuzma Safir-9 arm and cartridge and SJS Acoustics amplification. This system turned what can be very challenging music into an immersive experience."

The Ear

It was excellent to see so many familiar faces, including customers old and new. Hopefully we can meet up again in 2024.

SJS Arcadia Model 5 Premier

Nanocrystalline magnetic cores, such as Hitachi FINEMET, exhibit very high permeability, low power loss, high saturation, very low hysteresis levels up to high frequencies,  and provide a very special musical experience.

This SJS Arcadia Model 5 Premier amplifier is hot off the bench, and the first to have both triple C-core nanocrystal output transformers and a pair of power supply chokes.

The Premier version of the Model 5 has replaced the 6SN7 input & driver stage with NOS Sylvania  7N7 valves, which are equivalent to 6SN7 but in a Loctal soctet. It also comes with very special Duelund CAST DC silver foil coupling and bypass capacitors, and Audio Note AN-V silver litz input cable, and features the new solid surface non-magnetic transformer covers.

In common with other SJS Arcadia amplifiers it has been specifically engineered for sonic performance rather than technical specification, and fulfills SJS Electroacoustics primary design criteria:

• Single Ended circuit topology
• Pure Class A operation
• Zero negative feedback
• Valve rectification and choke smoothed HT power supply
• Custom made HT T-network power supply capacitors with silver leads
• Separate mains transformers for HT and filament supplies
• Point-to-point circuit wiring without PCBs
• Star-earth & star-supply wiring
• Hand built
• Real solid wooden frame
• 4mm aluminium panels, black or natural anodized
• Soundcare SuperSpike feet
• Very low noise for use with high efficiency loudspeakers

This Premier version includes:

• Nanocrystalline triple core output transformers
• Nanocrystalline power supply chokes
• Duelund CAST DC Silver foil coupling capacitors
• Duelund CAST DC Silver foil bypass capacitors
• Tantalum film resistors
• Pure silver wire for all point to point connections
• Non-magnetic solid surface transformer covers

Delivered with solid walnut frame, black anodised aluminium panels and the dark grey transformer covers can be heard on demonstration at Definitive Audio in Nottingham alongside the rest of the SJS Arcadia range of amplifiers with Living Voice loudspeakers.