Monday, 15 March 2021

SJS Arcadia Model 7 options

A new SJS Arcadia Model 7 Enhanced valve linestage pre-amplifier ready for delivery to Definitive Audio.

The first amplifier sporting our new super high grade mains transformer with copper plated frames.

Enhanced version with choke loaded triode gain stage, Duelund CAST DC coupling capacitors and pure silver wiring throughout.

Each one is hand built to order and can arrive with your choice of finish for the front panel and dials.

Which to choose?

Saturday, 16 January 2021

SJS Arcadia Model 5 Enhanced Silver

 A special edition of the Model 5 enhanced, with very special Duelund CAST DC silver foil coupling capacitors and Audio Note AN-V silver litz input cable

This amp comes with customer specified Maple frame, black anodised aluminium panels and metallic gunmetal transformer covers.

The classic 6SN7 - 300B circuit is the same. all the internal wiring is solid core silver with ptfe insulation, and point to point wired with star earth to maximise transparency.

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
  • Hand built
  • Real solid wooden frame
  • 4mm aluminium panels, black or natural anodized
  • Soundcare SuperSpiked feet

This Enhanced version includes:

  • Shinkoh tantalum film resistors
  • Black Gate bypass capacitors
  • Duelund CAST DC Silver foil coupling capacitors
  • Custom HiB double C-core output transformers
  • Pure silver wire for all point to point connections

This amp will soon be on demonstration at Definitive Audio in Nottingham alongside the rest of the SJS Arcadia range of amplifiers and their musical range of Living Voice loudspeakers

Tuesday, 10 November 2020

SJS Arcadia Model 7 dark star

Busy during lockdown, and ready to bounce back with the new dark star version of the SJS Arcadia 7 linestage preamplifier.

Enhanced version in black with choke loaded triode gain stage, Duelund CAST capacitors and pure silver wiring throughout.

Standard version in natural with Duelund RS capacitors

Standard and Enhanced versions now on demonstration at Definitive Audio in Nottingham.

Friday, 10 January 2020

Arcadia 18W PSE 300B Amplifier Repairs

An original Arcadia 18W PSE 300B amplifier has been in for servicing and repairs.

Originally supplied in 1997 it was enhanced with a large external dual-mono power supply in 2004.

Following a number of amendments, and a period of time in storage, it has been thoroughly repaired and serviced. A couple of damaged chokes have been replace, some of the psu capacitors replaced, a new pair of 6072A input and 5687WB driver valves, and a new set of EH Gold Grid 300Bs are now being used instead of the TJ mesh plate 300B/n valves shown.

The PSU contains a large mains transformer for each channel, plus valve rectifiers, choke input and first psu cap for the input/driver psu. The psu is remotely switched on/off from the main chassis.

Inside the main chassis there are two mains transformers for the 300B filament supplies, and six more chokes for the various power supplies.

In total there are three valve rectified, choke input filtered power supplies per channel, making six in total. One for the 300Bs, the second for the input/driver stage, and the third for the negative bias supply.

The components inside are typical of the period, including Elna Cerafine HT caps for the 300B ht, a lot of Black Gates, Hovland coupling caps, Mills and Rhopoint wirewound and even a couple of tantalum film resistors.

The servicing should see it good for many years to come.

Sunday, 10 March 2019

Arcadia Model 7 Linestage Preamplifiers

It is two years since the first of the new SJS Arcadia Model 7 linestage preamplifiers were developed. 

During this time we have continued with research and development to further refine the musicality of the amplifiers, as well as offering both a Standard and Enhanced version of the design.

The Standard version has carbon film resistors and an RC couple gain stage:

The Enhanced version has tantalum film resistors, a choke loaded LC couple gain stage and enhanced psu choke:

Both versions feature 6111wa NOS military twin triode valves in the gain stage, Duelund Coherent Audio copper foil coupling capacitors, and the common SJS design elements:

  • Single Ended circuit topology
  • Pure Class A operation
  • Zero negative feedback
  • Valve rectification and 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
  • PTFE board for component mounting
  • High quality components throughout
  • Custom made aluminium chassis

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.

                Thursday, 17 May 2018

                Munich High End 2018

                This year marked the debut of SJS Electroacoustics Arcadia amplifiers at the Munich High End show, probably the largest high end audio trade fair in Europe.

                Two SJS Arcadia Model 3 Enhanced MM phono stage amplifiers were present, one in the Living Voice room and the other in the Engström room.

                The Living Voice room featured the Vox Olympian and Vox Elysium loudspeakers, partnered with vintage Kondo M77 and Gakuoh amplifiers. the vinyl front end was the Grand Prix Audio Monaco 2.0 turntable, with a Kuzma 4-point tonearm, and a Fuuga MC cartridge connected via a Living Voice step-up transformer to the Model 3 in oak with natural aluminium panels.

                The Engström room featured the Vox Palladian & Palladiam Basso loudspeakers, partnered with Engström Monica and Lars pre and power amp combination, or the new Arne 300B integrated amplifier. The vinyl front end was a Kuzma Stabi M turntable, with Stogi S 12 VTA tonearm and Van den Hul MC catridge with a Kondo SFz step-up-transformers to the Model 3 in walnut with black aluminium panels.

                Both Model 3 phono stages used in Munich were a customised version of the Enhanced Model 3. They were voiced in collaboration with Kevin Scott of Living Voice ahead of the show and feature NOS Shinkoh tantalum film resistors and Duelund Audio CAST copper coupling capacitors.

                SJS Arcadia Model 3 phono amplifiers are available for demonstration at Definitive Audio in Nottingham, or here in Manchester.

                Thursday, 9 November 2017

                Model 9 SUTs

                Newly completed and ready for delivery, three SJS Model 9 SUTs, including:

                • Hashimoto HM-7 transformers
                • Pure silver wire with ptfe insulation
                • Dual primaries can be switched for high/low impedance carts
                • Ground connection on the primary can be isolated for floating the MC coils
                • MuMetal lined aluminium casework
                • WBT NexGen sockets and WBT silver loaded solder

                The Hashimoto HM-7 transformers, which have dual primaries and may be switched in series or parallel, for matching medium (7 - 40 ohm) or low (2 - 7 ohm) impedance MC cartridges, providing gain of 15 times (23 dB) or 30 times (29 dB).