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SJS resuscitated

Discussion in 'trade discussion' started by sjs, Jul 13, 2015.

  1. sjs

    sjs Trade: SJS Electroacoustics

    three more of these Model 9 SUTs currently being built, pictures soon
  2. sjs

    sjs Trade: SJS Electroacoustics

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


  3. sjs

    sjs Trade: SJS Electroacoustics

    getting my first listen to Audio Note Non-Magnetic Silver Tantalum resistors and Dueland Hybrid copper/silver capacitors in one of the copper cased SJS Arcadia Model 2 preamps back in for some tlc


    too early to make any detailed appraisal, as there are number of other changes:
    • new first HT cap and shunt resistor
    • new silver tantalum film resistors
    • new Dueland silver/copper hybrid capacitors
    • new phono sockets
    • new valves
    I find the Dueland caps take at least a couple of days before they really settle down into what they do, but early signs of the whole shebang are really rather nice :eek:
  4. sjs

    sjs Trade: SJS Electroacoustics

    An original Voyd turntable from about 1986 back in for repair. the psu had dead and needed all the voltage regs, darlingtons and fets replacing before it was up and running properly, then I replaced all the electrolytic caps to help it last the next 30 years


    next up is this second Voyd turntable, which is one of the later units with the smaller sized Split Phase PSU, however this has 2 motors which have seized up. A full strip down and thorough clean up should see then right

  5. JenniferT

    JenniferT New Member

    Great news....... You can help me carry in my speakers on setup day.
  6. chris@panteg

    chris@panteg pfm Member

    A friend of mine brought the Arcadia phono and matching line pre amps, round one evening many years ago, they were superb.

    Didn't know you serviced Voyd turntables, another friend has one in need of some TLC .
  7. sjs

    sjs Trade: SJS Electroacoustics


    I have been a long time Voyd owner, from Valdi in the early 90s through to a Reference now. I have got a few Voyd TTs back up and running over the years. The most common problem is a stuck motor, they generally need a strip down and clean up and all is good again, but the early model above also had a completely fried psu, which was a bit more challenging ;)

    All the best
  8. chris@panteg

    chris@panteg pfm Member

    Hi Simon
    I used to have a voyd .5 reference ,but sold it regrettably , it was a fabulous deck .

    My friend has an earlier voyd with a psu like the top one, it's stopped playing at 45 rpm.
  9. sjs

    sjs Trade: SJS Electroacoustics

    The original Model 1 and 2 preamps, and the newer Model 7 preamp were all designed to work with valve power amps with a 100 kOhm input impedance.

    They can be used successfully down to 50 kOhm, but I wouldn't recommend them for amps with a 20 kOhm or 10 kOhm input, which is now typical among a lot of solid state power amps.

    This recently led to a challenge being presented when I was asked to develop a line stage preamp which could be used with a 10 kOhm input solid state power amp. Having thought about this I came up with two prototype amps rusttled up from parts left over form other amps, including a pair of rejected top panels from the Oyide headphone amps.

    The first one uses a triode strapped 8608 pentode, to give a low plate impedance high gm triode, using custom made double C-core output transformers with a centre tapped secondary to provide a balanced or single ended output.


    The second amp uses a 6EW7 double triode. The two triodes are dissimilar, and this uses the 2nd triode which has a mu of about 8 and plate impedance of less than 800 ohms. It is used with a choke load on the anode and output coupling caps.


    In the interest of fairness, both use the same mains TX and psu choke, both use a 5Y3 rectifier, with choke input and Mundorf HV+ cap, followed by an LC filter to each channel.

    They have many similar characteristics, but also interesting differences.
  10. sjs

    sjs Trade: SJS Electroacoustics

    I used a 0.5 for years before I got my Reference :D

    Interesting problem with the psu, hopefully he doesn't have a massive collection of singles :eek:
    chris@panteg likes this.
  11. chris@panteg

    chris@panteg pfm Member

    He has a number of excellent 45 rpm lps, so is sending it off for repair.

    Lovely looking amps those, I really fancy getting a triode amp again this year.
  12. sjs

    sjs Trade: SJS Electroacoustics

    Hope he gets it sorted and can listen to his singles.

    Glad you like the look of the amps, thanks
    chris@panteg likes this.
  13. BD-Audio

    BD-Audio Trade: BD Audio

    SJS amplifiers are timeless, much like Voyd turntables. Keep up the good work.
    chris@panteg and hifinutt like this.

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