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Thread: A Power Amp for Paul

  1. #11
    Join Date: Mar 2012

    Location: Gloucestershire

    Posts: 3,377
    I'm Paul.

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    Quote Originally Posted by Radford Revival View Post
    I thought it was the bribery
    ....that as well!

  2. #12
    Join Date: May 2012

    Location: Maidstone

    Posts: 977
    I'm James.

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    Fantastic chaps, really interesting thread.
    Source: Heavily modified DDDAC using MacBook Pro.
    Amplification: Pre amp-Stereo Coffee pre amp on steroids.
    Power amp- Rather large Colin Wonfor Class A power Amp
    Speakers: Lampizator P17 Open Baffles
    Accessories: Klotz 500 DIY Interconnects & DIY speaker cable sounding better than anything commercial.
    All powered from a Mother Trucker BPS with a dedicated consumer unit with 10mm armoured radial back to the house tails after the meter.

  3. #13
    Join Date: Apr 2012

    Location: South West of England

    Posts: 263
    I'm Will.

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    Not the best pic, but if you look carefully you'll see that the mains transformer is not actually flush against the chassis, but sitting about 2mm above it. This is because I use a form of resilient mounting to reduce mechanical buzz. It is difficult to see but in the darker portions of the image you can see the transformer is sat on rubber washers.




    From the underside you can see there are also rubber washers, with large M5 penny washers to spread the load over the entirety of the rubber. The whole transformer is then "floating".



    Here is the hardware I use to mount the mains transformer. I make the rubber washers myself with a CNC router.
    Radford Revival
    www.radfordrevival.co.uk

  4. #14
    Join Date: Apr 2012

    Location: South West of England

    Posts: 263
    I'm Will.

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    Here are a couple of the boards that form part of the power supply.

    The HT winding resistance of the mains transformer is very low. This causes pretty sharp charging pulses that cause some of the mechanical buzz. These resistors counteract that somewhat, as well as lowering the HT voltage a little bit. Better to have the heat generated outside of the transformer rather than inside it via a resistive winding. The HT winding is also fuse protected in the event of a catastrophic failure of a capacitor or rectifier diode.



    This board forms part of our new protection circuitry. The control part is on another board, this just houses a relay (440Vac rated), and an HT fuse for one channel.



    We have a big stock of stainless hardware (ignore the errant galvanized hex spacers in there, they are never used!). This is one of a few racks filled with lots various high quality fasteners.

    Radford Revival
    www.radfordrevival.co.uk

  5. #15
    Join Date: Mar 2012

    Location: Gloucestershire

    Posts: 3,377
    I'm Paul.

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    If it wasn't for the green fuse board in the second from last picture Will, I'd say that was just nuts!

  6. #16
    Join Date: Apr 2012

    Location: South West of England

    Posts: 263
    I'm Will.

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    Quote Originally Posted by Reffc View Post
    If it wasn't for the green fuse board in the second from last picture Will, I'd say that was just nuts!
    Radford Revival
    www.radfordrevival.co.uk

  7. #17
    Join Date: Aug 2011

    Location: Nottingham

    Posts: 575
    I'm Ian.

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    Words from another Will......William Morris......Have nothing in your houses that you do not know to be useful or believe to be beautiful.

    It truly is wonderful to see something built with such skill, knowledge and care. I believe you hit the Mr. Morris quote on both counts Will ! This will be a joy to own.

  8. #18
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 6,089
    I'm Alan.

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    Quote Originally Posted by Radford Revival View Post
    Here are a couple of the boards that form part of the power supply.

    The HT winding resistance of the mains transformer is very low.........Better to have the heat generated outside of the transformer rather than inside it via a resistive winding.


    What I absolutely admire about your builds Will is the technical attention to detail. Above is an excellent approach and so impressive is to slot the pcb to ensure maximum cooling of the resistors

  9. #19
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 99,005
    I'm Grant.

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    Indeed, a very classy build.
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    FIIO K7 BT, M11 PLUS, BTR7, KA5 - OPPO BDP-103D - PANASONIC UB450 - PANASONIC 4K ULTRA HD TV - PIXEL 6 - AVANTREE LR BLUETOOTH - 2* X600 SOUNDCORE - HEADPHONES INCLUDE, FIIO, NURAPHONES', FOCAL, OPPO, BOSE, CAMBRIDGE, BOWER & WILKINS, DEVIALET, MARSHALL, SONY, MITCHELL & JOHNSTON - 2*ZBOOK'S- MERCURY BD ROM, ROON, QOBUZ, TIDAL, PLEX, CYBERLINK, JRIVER - MULTI HDD'S -

    Oh my god! There's nothing wrong with the bidet is there?

    “Nothing discloses real character like the use of power. It is easy for the weak to be gentle. Most people can bear adversity. But if you wish to know what a man really is, give him power. This is the supreme test. It is the glory of Lincoln that, having almost absolute power, he never abused it, except on the side of mercy".

    “You see these dictators on their pedestals, surrounded by the bayonets of their soldiers and the truncheons of their police ... yet in their hearts there is unspoken fear. They are afraid of words and thoughts: words spoken abroad, thoughts stirring at home -- all the more powerful because forbidden -- terrify them. A little mouse of thought appears in the room, and even the mightiest potentates are thrown into panic.”

    "You don't have free will. You have the appearance of free will.”

    “There's a war out there, old friend. A world war. And it's not about who's got the most bullets. It's about who controls the information. What we see and hear, how we work, what we think... it's all about the information!”


    ***SMILE, BE HAPPY***

  10. #20
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 9,302
    I'm Andrew.

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    I think your going to love the Radford Paul, they certainly make my MG 15" in your custom cabs sing
    SS
    CD Teac VRDS25X(Audiotuned) DECK 1210 Mat Crystal Audio Mods MN Base/Bearing/Platter+Ebony armboard Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/3 Stage Regs/Recap PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black FGS CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

    VALVE
    PRE
    Croft Epoch(Modded) AMP Sondex S100 (Modded) SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Ref XO + Batpure supertweeters DECK Garrard 301 Mat Teunto Bearings 401(Bastin) Plinth Bamboo Arms 3009/3012 PSU Eagle+Tachometer MC Ag Meister II/FGS + Ortofon SPU MONO CABLES Arm Yannis 420.5 Litz+ SpeakerPC Tripple C+WBT-0681 Ag IC Oyaide FTVS-510 AgWBT 0110Ag Phonostages Paradise(4 Box Mega-Modded) / Croft Musicmaker



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