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Thread: Wanted - First Watt F5 good DIY build

  1. #21
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 2,821
    I'm Tom.

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    Is there no penalty for driving these chips hard? Otherwise why run them gently at all, as in the original?
    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers; Amp - Radford STA100; Pre EAR 912; Vinyl: Thorens TD124 MkII + Ikeda IT345-CR1 / Ortofon 309 Limited tonearms; Cartridges Stereo - Miyajima Madake, Ortofon SPU Royal N + Shure M3D Jico stylus; Mono - Miyajimas - Zero 0.7, Premium 1.0 retipped by Ana Mighty Sound bamboo cantilever, Spirit '78' 3.0 conical from Ana, also vintage GE VRII, Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage and SUT from EAR 912; Esoteric Sound Re-Equalizer for equalisation of early mono and 78, switchable in from tape loop; Digital: Audio Note CDT2/II transport, heavily modded AN Kit DAC + Mutec MC3+USB.

    Study: Speakers - Tannoy DC6; Amp: Duncan 'Tuberhunter' 200w class D; preamp - Pass DCB1; Vinyl: Garrard 401 with AT1503 tonearm and vintage SPU-GE; SUTs - Ortofon 2-15k & Bob's Devices; Phono Stage: Schiit Mani; Digital - Trichord Genesis III CDP + Arcam rBlink; Schiit Multibit DAC.

  2. #22
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 222
    I'm Sandro.

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    There is a common opinion that 1.3 A bias is the ideal for sound quality whit the stock mosfets or about 25 W dissipation on each so the stock / Vanilla version runs at 18 V 1.3 A

    Whitout cascading the maximum voltage for the inputs Jfet is at around 30 Volts and as the mosfets are voltage driven it is quite easy to drive several of them in parallel the limiting factors became the size of the heath sink and the quality of the coupling and as one push the output voltage the propensity of the amplifier to go in to current clipping, that is much worst than voltage clipping.
    Then one must consider that if the Mosfets break down they became closed circuit, so one end up whit the full rail voltage at the output, broken speakers and GF telling you I told you so
    I have the NTE7100 speaker protection on mine whit amplimo relays it all ads up to the cost
    I would certainly like to ear mine's whit a pair of Tannoy instead of the Polk IMO if you have Tannoy the vanilla version should be plenty

  3. #23
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 2,821
    I'm Tom.

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    Quote Originally Posted by Bksabath View Post
    if you have Tannoy the vanilla version should be plenty

    Was pleasant enough but not enough to really get the bottom octave sounding properly compared to my 100w Radford STA100 or even the 35w STA25 I'm running while this gets restored.

    Tannoy HPDs have a fairly complex crossover and also braced cones that need a lot more control than the earlier Gold series. It wasn't a good match.
    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers; Amp - Radford STA100; Pre EAR 912; Vinyl: Thorens TD124 MkII + Ikeda IT345-CR1 / Ortofon 309 Limited tonearms; Cartridges Stereo - Miyajima Madake, Ortofon SPU Royal N + Shure M3D Jico stylus; Mono - Miyajimas - Zero 0.7, Premium 1.0 retipped by Ana Mighty Sound bamboo cantilever, Spirit '78' 3.0 conical from Ana, also vintage GE VRII, Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage and SUT from EAR 912; Esoteric Sound Re-Equalizer for equalisation of early mono and 78, switchable in from tape loop; Digital: Audio Note CDT2/II transport, heavily modded AN Kit DAC + Mutec MC3+USB.

    Study: Speakers - Tannoy DC6; Amp: Duncan 'Tuberhunter' 200w class D; preamp - Pass DCB1; Vinyl: Garrard 401 with AT1503 tonearm and vintage SPU-GE; SUTs - Ortofon 2-15k & Bob's Devices; Phono Stage: Schiit Mani; Digital - Trichord Genesis III CDP + Arcam rBlink; Schiit Multibit DAC.

  4. #24
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 2,821
    I'm Tom.

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    For those interested I've just posted a mini review of the incoming power amp http://theartofsound.net/forum/showt...654#post935654
    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers; Amp - Radford STA100; Pre EAR 912; Vinyl: Thorens TD124 MkII + Ikeda IT345-CR1 / Ortofon 309 Limited tonearms; Cartridges Stereo - Miyajima Madake, Ortofon SPU Royal N + Shure M3D Jico stylus; Mono - Miyajimas - Zero 0.7, Premium 1.0 retipped by Ana Mighty Sound bamboo cantilever, Spirit '78' 3.0 conical from Ana, also vintage GE VRII, Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage and SUT from EAR 912; Esoteric Sound Re-Equalizer for equalisation of early mono and 78, switchable in from tape loop; Digital: Audio Note CDT2/II transport, heavily modded AN Kit DAC + Mutec MC3+USB.

    Study: Speakers - Tannoy DC6; Amp: Duncan 'Tuberhunter' 200w class D; preamp - Pass DCB1; Vinyl: Garrard 401 with AT1503 tonearm and vintage SPU-GE; SUTs - Ortofon 2-15k & Bob's Devices; Phono Stage: Schiit Mani; Digital - Trichord Genesis III CDP + Arcam rBlink; Schiit Multibit DAC.

  5. #25
    Join Date: Jan 2014

    Location: Northants

    Posts: 127
    I'm Martin.

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    Quote Originally Posted by lordmortlock View Post
    Id like to try a well built F5 power amp in my system as an alternative to valves. Does anyone have one that theyd like to sell please?

    Thanks, jake
    Jake - If you are still looking this one looks good over on PFM

    http://www.pinkfishmedia.net/forum/t...hannel.211059/

  6. #26
    Join Date: Aug 2010

    Location: Stroud, Gloucestershire , UK

    Posts: 457
    I'm Jake.

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    Thanks Martin, thanks for looking out for me. It’s looks very well built but a fair bit more than I was expecting to pay for a diy unit.
    Technics SL-10/various carts - Tube Technology MAC - Modded Sonos/Jolida Glass FX3 - Nelson Pass B1 or Eastern Electric minimax - Jsoundlabs 300b - Ian's Frugal horn XL

  7. #27
    Join Date: Feb 2010

    Location: Solihull

    Posts: 25
    I'm James.

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    Quote Originally Posted by lordmortlock View Post
    Thanks Martin, thanks for looking out for me. It’s looks very well built but a fair bit more than I was expecting to pay for a diy unit.
    Indeed. The parts cost (including the case) should be approx 500 - 700, maybe a bit more if boutique components have been used, but these amps sound great using the std BoM.

  8. #28
    Join Date: Nov 2008

    Location: belgrade serbia

    Posts: 605
    I'm gordan.

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    1750 may be just about the right price, if not too expensive, for a used stock version.

    there used to be a US builder who was selling FW amps at diyaudio.com forum. long time ago, i would say 10 years since he was massively loathed there. he was able to cut down costs on irrelevant parts (chasis) so was affordable, say $500. i used to have his F3 and it sounded as good as it gets. can't remember the name though, they appear from time to time.

    i would certainly extend the search to aleph series of sufficient power. F5 is hyped but in reality, sound-wise, not any better than alephs so a synergy with speakers may be more important.
    Gordan.
    Speakers: Oris Swing MkII
    Amps: Thomas Mayer 300b (main) or Hiraga La Maison de L'Audiophile 20
    Preamp: Dave Slagle EMIA AVC
    Phono Preamp: Shishido LCR by Solaja Audio
    Decks: Garrard 301 with Fidelity Research FR64fx (main) or Kuzma Stabi S with 4 Point
    Cartridges: SPU Spirit (main) or Koetsu Black revisited by Salai or Miyajima Shilabe
    Step Up Transformers: Tango MCT 999 (main) or Ortofon T-5000 or Luxman AD8000 with 8030 capsule or Fidelity Research FRT-5 or Lumiere SUT
    Digital: Akai CD-79 modded
    Wires: of sufficient length

  9. #29
    Join Date: Sep 2009

    Location: west mids, UK

    Posts: 1,698
    I'm Phil.

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    Quote Originally Posted by Brumjam View Post
    Indeed. The parts cost (including the case) should be approx 500 - 700, maybe a bit more if boutique components have been used, but these amps sound great using the std BoM.
    yes i was thinking that about that amp
    winters audio have a f1 if you get stuck
    1]bel canto pre 3 vbs /MSB s200 , / Marantz sa8005/ bel canto fm1
    sonos, . tannoy eaton legacy 2]naim supernait 2 rotel 965cd bel canto 3.5vbss and RFC impulse ta`us

  10. #30
    Join Date: Aug 2010

    Location: Stroud, Gloucestershire , UK

    Posts: 457
    I'm Jake.

    Default

    Quote Originally Posted by anubisgrau View Post
    1750 may be just about the right price, if not too expensive, for a used stock version.

    there used to be a US builder who was selling FW amps at diyaudio.com forum. long time ago, i would say 10 years since he was massively loathed there. he was able to cut down costs on irrelevant parts (chasis) so was affordable, say $500. i used to have his F3 and it sounded as good as it gets. can't remember the name though, they appear from time to time.

    i would certainly extend the search to aleph series of sufficient power. F5 is hyped but in reality, sound-wise, not any better than alephs so a synergy with speakers may be more important.
    Tim Rawson iirc Gordan ... I remember reading about his amps. The thrust seemed to be that the diy community had an issue with him profiteering from the pass schematic that had been released for the benefit of self builders
    Last edited by lordmortlock; 16-01-2018 at 19:33. Reason: Changed profiting to profiteering coz it sounded cooler when Tom said it
    Technics SL-10/various carts - Tube Technology MAC - Modded Sonos/Jolida Glass FX3 - Nelson Pass B1 or Eastern Electric minimax - Jsoundlabs 300b - Ian's Frugal horn XL

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