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Thread: DIY phonostage.

  1. #461
    Join Date: Mar 2010

    Location: Sheffield

    Posts: 2,898
    I'm Simon.

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    I use the values from the notes, not the schematic and have always built with j107 and 5102 or whatever the match is. I use mje350 and 220pf caps. On the shunt I run 8.2 ohm 5 watt non inductive wire wound five watts and heat output is modest if you use a 300mA choke regulated power supply/ pre regulator and stick to 25.5- 26v under load into the shunt.

    Slav I think I have a spare quad of those 8.2 ohm resistors. Ill include them with your coils if I can find them.

    Don't forget to lift that 100k before you plug them into your paradise. That 27r need only be 250mw, use a good metal film.
    Kuzma Stabi/S 12", (LP12-bastard) DC motor and optical tacho psu, Benz LP, Paradise (phonostage). MB-Pro, Brooklyn dac and psu, Bruno Putzeys balanced pre, mod86p dual mono amps, Yamaha NS1000m

  2. #462
    Join Date: Jan 2016

    Location: Shenfield

    Posts: 573
    I'm Slav.

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    Simon , don't worry about 8R2 resistors I have some 3W in the cupboard, appreciate your help with inductors

  3. #463
    Join Date: Mar 2010

    Location: Sheffield

    Posts: 2,898
    I'm Simon.

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    Theyre in the box, use then if you want. the extra dissipation keeps things cool.
    Kuzma Stabi/S 12", (LP12-bastard) DC motor and optical tacho psu, Benz LP, Paradise (phonostage). MB-Pro, Brooklyn dac and psu, Bruno Putzeys balanced pre, mod86p dual mono amps, Yamaha NS1000m

  4. #464
    Join Date: Jan 2016

    Location: Shenfield

    Posts: 573
    I'm Slav.

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    Quote Originally Posted by sq225917 View Post


    Theyre in the box, use then if you want. the extra dissipation keeps things cool.
    Very kind of you , thank you Simon

  5. #465
    Join Date: Mar 2010

    Location: Sheffield

    Posts: 2,898
    I'm Simon.

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    For a change I've been doing some metalwork for myself.





    What's under all those holes?




    Of course my soldering iron died today, so It's all on hold until a new iron arrives. Leaving me without a PSU for my Paradise. Time to turn on that dac....
    Kuzma Stabi/S 12", (LP12-bastard) DC motor and optical tacho psu, Benz LP, Paradise (phonostage). MB-Pro, Brooklyn dac and psu, Bruno Putzeys balanced pre, mod86p dual mono amps, Yamaha NS1000m

  6. #466
    Join Date: Dec 2010

    Location: North Lincs

    Posts: 193
    I'm Keith.

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    Nice work as always Simon.

    I see you recommend the addition of 33uf 50V Organic Polymer caps at the p/s input on the Paradise boards; from where do you obtain these as I cannot find them at either Farnell or RS.

  7. #467
    Join Date: Mar 2010

    Location: Sheffield

    Posts: 2,898
    I'm Simon.

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    Farnell, wurth make em
    Kuzma Stabi/S 12", (LP12-bastard) DC motor and optical tacho psu, Benz LP, Paradise (phonostage). MB-Pro, Brooklyn dac and psu, Bruno Putzeys balanced pre, mod86p dual mono amps, Yamaha NS1000m

  8. #468
    Join Date: Dec 2010

    Location: North Lincs

    Posts: 193
    I'm Keith.

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    Thanks Simon; found em.

  9. #469
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

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    Well got one Channel running
    And just spent 3/4 hours testing the second one which is not working
    All voltages are ok current throug the supply resistors is fine and I have made sure all transistor are the right way around and not mixed up the 337 whit the 327 about 12 times but no way I could find the blipping fault, then I just noticed that I was using the wrong channel plug from my passive RIAA
    Feel free to take the piss out of me ...

    I may get it to play tomorrow and start fine tuning

  10. #470
    Join Date: Jan 2016

    Location: Shenfield

    Posts: 573
    I'm Slav.

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    Powered up one channel , I have fairly big voltage fluctuation +/- 80mV on the output ( with 10k on input) and 1.6V on pin 6 of the OPA .
    I covered input stage transistors with little cardboard house , board sits in the box , all transistors matched within 2-3 Hfe , I guess I leave it powered for some time .

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