Hifi News

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

Posted on 17th December 2016

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

JR Tube Audio

Paul Rigby

I’ve been a journalist and editor for 35 years and still retain my good humour. Who’d have thought? I have worked within a range of industries, writing for hundreds of national magazines and newspapers in the UK, Europe and the USA covering: aviation, music, computer technology, computer gaming, hi-fi, mobile technology, home automation, lady’s lifestyle, plastic model making, antiques and more. I currently write for national magazines in the subjects of business, music, hi-fi and general technology.

7 Comments

max hardtmann

3rd February 2018 at 8:51 pm

Hello,
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.

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Max

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.

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max

3rd March 2018 at 1:07 pm

thanks a lot …. i go to news 🙂

Max

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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