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).

Wednesday 5 April 2017

North West Audio Show 2017


We are delighted to announce that we will again be exhibiting at the 4th edition of the NWAS which will take place in Cranage Hall and will run over 2 days.


NWAS is set to become one of the highlights in the audiophile calendar. With great exhibitors, top brands and a superb venue, we believe that the North West Audio Show gives attendees the opportunity to hear the very best audio in surroundings that are second to none.


Free entry, free parking, a day surrounded by the best in audio and all in the beautiful setting of Cranage Hall, Cheshire. Book your free entry ticket(s) and enjoy a great audio festival at Cranage Hall in 2017 with best HiFi, live music, Audio Talks and more. Register and secure your free tickets today.

Thursday 23 March 2017

SJS Arcadia Model 7 Line Pre-amplifier

Following on from the successful launch of the Model 3 riaa, and the Model 5 power amp, SJS Electroacoustics are pleased to present the new Model 7 line stage pre-amplifier. The Model 7 has been designed as the 20th Anniversary re-imagination of the original Arcadia Model 1 line stage pre-amplifier, which was first delivered to customers in early 1997.

The Arcadia Model 7 line stage is based upon the same 6111wa NOS military valve and has been specifically engineered for sonic performance rather than technical specification, and fulfils all SJS Electroacoustics primary design criteria:
  • 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

Design Options
The Model 7 line pre-amplifier is hand built to order in England, and therefore we are bale to offer customisation to meet your sonic preferences. Bespoke customisation of the internal components is possible to meet our clients' specific requirements, whether it is replacement of the Audyn capacitors with Duelund RS or CAST or possibly even using Tantalum film resistors, for example, these can be discussed at the point of ordering.

Technical Specifications
Input Impedance
100 kOhm
12 dB
Frequency Response
+/-3dB 3Hz-100KHz
Valve Compliment
2 x 6111WA
1 x EZ80
Max. Power Consumption
100 Watts
Unit Weight
10 kg 
Shipping Weight
15 kg
(Original Packaging)
Unit Dimensions
100mm (h) x 450mm (w) x 400mm (d)
Shipping Dimensions
180mm (h) x 545mm (w) x 500mm (d)

(Original Packaging)

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.

Monday 6 February 2017

Model 9 SUT

I have just finished this little project making up some nice MC step-up-transformers (SUTs) using the fantastic Hashimoto HM-7 transformers from Japan.

Hashimoto Electric have been making audio transformers since 1958 and was a transformer supplier to Sansui Electric until 1979 when they took over the entire Sansui transformer business, including patents, blue prints, designs and personnel.

Little known outside Japan until the past few years, their transformers are winning a lot of admirers, and the HM-7 MC stepup transformers have gained something of a reputation for outstanding performance.

The HM-7 has dual primaries which may be wired in series or parallel, for matching to medium (7 - 40 ohm) or low (2 - 7 ohm) impedance MC cartridges, providing a gain of 15 times (23 db) of 30 times (29 dB).

The lower cost HM-X has very similar specifications, and trades some low frequency performance for high frequency extension. The HM-3 model is almost half the cost of the HM-7, it offers 20 times (26 dB) or 40 times (32 dB) gain but has less high frequency extension than either the HM-X or HM-7.

The transformers are supplied in cans with solder connections, so they need to be built into a case for ease of use.

The switches on the left select series or parallel connection of the primaries, and the switch on the right connects or disconnects the primary winding ground to the secondary winding ground, to enable the primaries to "float".

Between the input and output phono sockets are a pair of "load" sockets, which can be used to plug in secondary loading resistors if desired.

The inside of the case is lined with mu-metal sheet to help minimise noise and hum pickup.

The finished SUT can be supplied with any of the three Hashimoto stepup transformers, HM-3, HM-X or HM-7 to best match with cartridge and budget.