Hifi News

jr tube audio EL84 high end monoblocks: Custom designed and dual mode

John Nouwens has custom-designed and built a pair of intriguing new valve-based monoblock amplifiers


The amps feature high bandwidth output transformers (24Hz to 72 kHz at full power), a dedicated CLCRC power supply with high percentage polypropylene capacitance and silver-plated OFC copper/teflon insulated wiring throughout.


The pair offer 15W of power at less than 1.5% distortion, very low negative feedback and a triode/pentode mode with ECC83 driver tubes.


Commenting on his transformers within the monoblocks, Nouwens said that, “It takes me around three hours to wind a single transformer. Much care is taken to ensure the windings are neat, that the interleaving paper is exact to the sides of the bobbin and that the windings fill completely to the edges. Interleaving paper is either Nomex or beeswax-impregnated craft paper.”


To learn more click on jrtubeaudio.blogspot.co.uk or on Facebook HERE

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  • Reply
    max hardtmann
    3rd February 2018 at 8:51 pm

    do you allow to take a photo and a small description on this EL84 monoblock for my new book about tube amps ?
    I will note the source as you wish.

    hanks Max

    • Reply
      Paul Rigby
      4th February 2018 at 12:25 pm

      Hi Max – I’m afraid you’d need to talk to the owner of the images copyrights for that. They’re not mine. I was only able to use them for a news piece.

  • Reply
    2nd March 2018 at 3:04 pm

    thanks for reply .-)
    would you make a contact so that
    i can ask him himself ?

    thanks Max

    • Reply
      Paul Rigby
      2nd March 2018 at 3:28 pm

      If you contact direct using the contacts at the bottom of my news piece, I’m sure that will be fine, Max.

  • Reply
    3rd March 2018 at 1:07 pm

    thanks a lot …. i go to news 🙂

  • Reply
    18th April 2018 at 9:49 am

    hi again,

    please may i ask again for using that el84 monoblock info for my little tube amp book ?
    i did not get usable answer.

    thanks max

    • Reply
      Paul Rigby
      18th April 2018 at 10:26 am

      Hi Max – I seem to recall that you asked to use the image I used in my story. I explained that I did not own the copyright and that it was best to contact the company directly. Other specific information can also be found from the company. Actually, if you ask them, you should be able to obtain much more than I printed. Was there something else you required?

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