1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Where we are now: The site is back up and running! The character set encoding issue has been fixed so old posts should now look ok. I am currently working on themes/skins etc and I will be deleting the temporary green skin very soon as it has many issues. I will do a very quick variation on the stock blue skin first just to get a light-grey background and san-serif font, and I will set this as default. Later this week I will hopefully add a professional third-party skin in pfm colours (life is way too short to do this crap myself, and I've found one I really like than needs next to no tweaking). We are getting there slowly...
    Dismiss Notice
  3. May I please request people check and update their email address if it is out if date. I ask as I’m getting countless bounce errors as the server fails to send notifications through etc. I’ll eventually figure out how to send these to a black hole somewhere, but it makes sense to address it at source as quite a few folk are obviously not getting the thread and conversations notifications they have set in their preferences.
    Dismiss Notice
  4. Things you need to know about the new ‘Conversations’ PM system:

    a) DO NOT REPLY TO THE NOTIFICATION EMAIL! I get them, not the intended recipient. I get a lot of them and I do not want them! It is just a notification, log into the site and reply from there.

    b) To delete old conversations use the ‘Leave conversation’ option. This is just delete by another name.
    Dismiss Notice

Elsdon Wonfor Audio Ltd

Discussion in 'trade discussion' started by CJ14, Nov 17, 2017.

  1. CJ14

    CJ14 Trade: Elsdon Wonfor

    Hi this is the first time EWA has had a trade account on PFM.

    But I Colin Wonfor will be posting on the companies behalf, and as a private person in other areas.

    Now retired and trying to relax, yer right I would get bored.

    I am not a director or a employee of EWA just to make that clear, my designs are used for a lot of the kit but the day to day running is done 120 miles away.:)

    Well best all.

    Col
     
  2. CJ14

    CJ14 Trade: Elsdon Wonfor

    he New M100 dual mono power amplifier, 100W/8, 200W/4 with balance and RCA in. Made to order only.

    [​IMG]

    [​IMG]

    [​IMG]
     
  3. CJ14

    CJ14 Trade: Elsdon Wonfor

  4. CJ14

    CJ14 Trade: Elsdon Wonfor

    Our new, and we think revolutionary cables, will be available as Speaker cables, Interconnects and Mains cables.

    The cables follow on from Colin Wonfor's previous designs by adding improvements in the noise cancelling / rejection area.

    The main design objectives for all the cables were
    Remove as much common-mode noise as possible from the signal.
    Ensure that the cable itself itself does not generate any noise / RFI.
    Make the cable as immune as possible to external noise.

    These objectives were applied to both Signal level cables (Interconnects / Loudspeaker) and Power cables (Mains).

    Performance data for each cable will be published in due course.


    [​IMG] [​IMG] [​IMG]
     
  5. CJ14

    CJ14 Trade: Elsdon Wonfor

    Specifications for the M50 Stereo Power Amplifier.

    Input.

    The input impedance is 22KΩ
    Input sensitivity for full power is 1V providing 50W into 8Ω both channels driven.

    Output.

    Power rating 50W/8Ω both channels
    100W/4Ω both channels

    DC offset < 5mV
    Noise open input < 2mV

    Peak Current > 64 Amps peak.
    Bandwidth 10Hz – 120KHz ±1dB
    Damping Factor > 100

    Power Consumption.

    Mains on standby < 1W
    Power on no signal < 40W

    Power Supply.

    The aux standby power supply is used to soft start the main amplifiers power supply.
    The main PSU consists of a 350VA transformer and four large 10,000µF/50V bulk capacitors.
    [​IMG] [​IMG] [​IMG]
     
  6. CJ14

    CJ14 Trade: Elsdon Wonfor

    Q-20-P Preamplifier

    Specifications for the Q20P Preamplifier.

    Inputs

    All inputs are specified for a line-level output of 1 volt into a 10KΩ

    Moving Coil Standard loading 100Ω - 470Ω with a loading capacitance 1000pF
    Input sensitivity is typically 100µV.
    Frequency Response 20Hz – 20KHz ± 0.5dB

    Moving Magnet Standard loading 50K Ω with a loading capacitance 100pF
    Input sensitivity is typically 5mV – 10mV
    Frequency Response 20Hz – 20KHz ± 0.5dB

    Aux input Standard input for a line level device.
    Input sensitivity 200mV typical
    Frequency Response 10Hz – 100KHz ± 1dB

    Output

    The frequency response for various loads is specified for 1 volt

    Minimum load 100Ω 16Hz – 100KHz
    Nominal load 10KΩ 5Hz – 200KHz
    High level load 100KΩ 5Hz – 200KHz


    Headphones

    SECA Headphone output Bandwidth is 10Hz – 40KHz loading minimum 65Ω
    Maximum output voltage with no load is 15V Peak.
    1 volt input level gives a peak output of 4V.

    Available power for differing headphone impedances:-

    5mW @ 47R or 0.5VRMS
    12mW @ 100R or 1.0VRMs
    15mW @ 150R or 1.4VRMs
    25mW @ 200R or 2.1VRMS
    40mW @ 600R or 4.9VRMS

    Power Requirements

    On Power Less than 5W
    Regulated Power Supplies ±15V for SECA headphones
    ±15V for line out stage
    ±20V & ± 18V for phono stage
    +5V for standby
    +12V for selection relays


    Bulk capacitors total for pre-amp 10,000uF at 40V.
    [​IMG] [​IMG] [​IMG]
     
  7. CJ14

    CJ14 Trade: Elsdon Wonfor

    Specifications for the M50P Preamplifier

    Inputs

    All inputs are specified for a line-level output of 1 volt into a 10KΩ load.

    Moving Coil

    Standard loading 100Ω - 470Ω with a loading capacitance 1000pF
    Input sensitivity is typically 100µV.
    Frequency 20Hz – 20KHz ± 0.1dB

    Moving Magnet

    Standard loading 47K Ω with a loading capacitance 100pF
    Input sensitivity is typically 5mV – 10mV
    Frequency 20Hz – 20KHz ± 0.1dB

    Aux input 1

    Standard input for a line levels device.
    Input sensitivity 200mV typical
    Frequency 0.5Hz – 200KHz ± 0.1dB

    Aux input 2

    This input has a subsonic and DC roll-off making it ideal for portable devices which often have small DC on their outputs.
    Input sensitivity 200mV typical
    Frequency 1.5Hz – 200KHz ± 0.1dB


    Outputs

    Outputs 1& 2

    The frequency response for various loads is specified for 1 volt output with both channels driven.

    Minimum load 100Ω 16Hz – 200KHz
    Nominal load 10KΩ 0.5Hz – 200KHz
    High level load 100KΩ 0.5Hz – 200KHz

    Headphones

    Frequency Response 10Hz – 50KHz into 65Ω load
    Maximum output voltage with no load is 15V Peak.
    1 volt input level gives a peak output of 4V.

    Power Requirements

    Standby Power Less than 1W
    On Power Less than 8W

    Regulated Power Supplies

    ±15V for SECA headphones
    ±18V for line out stage
    ±17V for phono stage
    +5V for standby
    +12V for selection relays
    +12V for power On relay.

    Bulk capacitors total for pre-amp 19,800µF at 40V.
    [​IMG] [​IMG] [​IMG]
     
  8. CJ14

    CJ14 Trade: Elsdon Wonfor

    A new improved Claymore.

    [​IMG]
     
  9. CJ14

    CJ14 Trade: Elsdon Wonfor

    Here are the line level plus simple DAC pre-amp and the M50 Pro version . POA

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
  10. CJ14

    CJ14 Trade: Elsdon Wonfor

    This is what EWA LS25 (LSXXV) looks like.

    [​IMG]

    [​IMG]

    LS-XXV is LS25 and LS-V is LS5 and the 3.0 and 5.0 are metre pairs not each, a little cheaper than the last cables I designed but much much better.
     
    Alan Brown likes this.
  11. Alan Brown

    Alan Brown Registered LUser

    Yup - I can vouch for this.

    Col, I will talk with you about the power cord on my M50. Perhaps a little visit and some lunch soon?

     
    CJ14 likes this.
  12. Megeake2

    Megeake2 New Member

    Hi Colin,
    I have been following EWA development closely. I already have the LS-25 which I purchased following a nice result from (your previous) TQ ultra black interconnects. Now that the wife friendly black boxes have appeared this has made them potentially obtainable for me at some point (funds dependant!). I have a few questions as at this juncture very few if any reviews are available on your equipment (you must have either upset some people or there is nothing in it for them - (I find my cynicism gets worse with age!)). All I know is that I have yet to read a negative or even middling review on anything you touch (other than possibly appearance!) and you certainly don't promote yourself which of course leads me to trust your products more than the next.
    My questions then:
    1) Is that a new dual mono M50 PA I see in its black box? If so, is this the one reviewed by Alan Brown or was that the silver one?
    2) I think I would miss a remote. Are there any pre-amps that you would recommend (with remote) new or old to match the M50 PA and would my old MF A3 dual mono be disastrous in a pre-amp role in the short term?
    3) I'm not even going to ask the price at this stage!!
    4) Oh - and one irrelevant question that I have been dying to ask you - what is your opinion on the Lavardin 'memory distortion' thing. Is this anything that you have witnessed or investigated? Living in Ireland, it is almost impossible for me to listen to let alone compare hi-fi equipment (Cloney audio - but they wouldn't have any of your amps).
    Thanks
     
  13. CJ14

    CJ14 Trade: Elsdon Wonfor

    "1) Is that a new dual mono M50 PA I see in its black box? If so, is this the one reviewed by Alan Brown or was that the silver one?" The large one is a dual mono at 100W/ch, the small one is a stereo at 50W/Ch

    "2) I think I would miss a remote. Are there any pre-amps that you would recommend (with remote) new or old to match the M50 PA and would my old MF A3 dual mono be disastrous in a pre-amp role in the short term?" I have no clue about the MF A3, if it can drive a 10K load then there should be no problems.

    "3) I'm not even going to ask the price at this stage!!" It is on the web site

    "4) Oh - and one irrelevant question that I have been dying to ask you - what is your opinion on the Lavardin 'memory distortion' thing. Is this anything that you have witnessed or investigated? Living in Ireland, it is almost impossible for me to listen to let alone compare hi-fi equipment (Cloney audio - but they wouldn't have any of your amps).
    Thanks"
    I have made SS amps sound like tube amp but with lets balls. I think it another selling gimmick and no relevant to what listener wants to hear and enjoy.

    As to the first part adverts pay so mags controlled by revenue and larger companies normally get good reviews and coverage, i.e.TQ Naim,etc
    I would love somebody like Neol Keywood to review my kit but I could not afford to waste money on a advert costing £1000s and to recover this amount on sale and profit would mean a false pricing structure.

    I also love designing and learning so tend to do the odd few specials just for fun, and now in poor health do I need the crap ?? NO I do not.
    I am about to do 10 only signature EWA Claymore's with FETS and Not Transistor in the output the cost prohibits this as a full production project.
    The FET's will be 16A 250W 160V and not the standard 8A devices , and I say only 10 of them.
     
  14. CJ14

    CJ14 Trade: Elsdon Wonfor

    A lovely mini review of the EWA LS25 from Ed, thank for your comments Ed.

    Hello Colin

    One of the best things that has happened in my audio journey has been acquainting you through the Hi Fi Answers website. I got the LS25 cable from Mike Manning, and I am absolutely delighted with them. The TQ Black is a very (pun alert!) sound cable, but I don't think that the word 'upgrade' does justice to the LS25. Here's a copy of feedback I sent Mike recently.

    I started with an Isotek burn-in CD, since when I've had round the clock music and radio on, volume dependent on if I want to listen, including all night radio at neighbour friendly volume. So nicely run-in.

    "When I was at first playing albums and tracks after installing the cable a week ago, I wrote comments picking out impressions as each one played (both LP and CD). Here's a compilation of some of them: more bounce - more body to acoustic instruments - more 'reed' to saxaphone - fuller midrange, as if a tone button was turned - altogether better tonal balance - warmer but accurate - trumpet more natural - wider soundstage - I want to hear everything at a louder volume than before - retains detail and ambience when volume down to night time levels - excellent bass - sharp drumming - perfect for female vocal.

    Today I did something I've never been able to before, I played five LPs straight through one after another. No listener fatigue, no aggravating emphases anywhere. And all with the famous Naim PRaT.

    Speaker cables which I have used or auditioned; two excellent Kimbers, Townshend Isolda, Chord Reference, Tellurium Blue then Black, and I firmly state that with my system, room acoustics and hearing, these LS25s are faraway the best.

    Wanting to mitigate certain highest frequencies that were uncomfortable for me I had asked a high-end audio dealer, and then a specialist cable retailer, if it could be done with speaker cable, and they both said no. Well, genius Colin Wonfor has achieved it!"

    best wishes

    Ed
     
  15. Megeake2

    Megeake2 New Member

    Thanks Colin, I'm going to have to start saving (and convincing the wife) for that M50 then. Here's hoping you keep yourself in good health.
     
    CJ14 likes this.
  16. Alan Brown

    Alan Brown Registered LUser

    Hi Colin,

    It was great to see you last week (as always). I just wanted to say how impressive the MC-5 cables are, I'm really struggling to comprehend why power cables should make a difference. I'll be making payment shortly, these are definitely staying - the first aftermarket power cables I've ever bought!

    I'll try to add some more useful feedback when I can articulate my impressions. Thanks again!
     

Share This Page