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Thread: Firebottle hybrid valve monos

  1. #1
    Join Date: May 2014

    Location: Solihull

    Posts: 607
    I'm Martin.

    Default Firebottle hybrid valve monos

    [FONT=Arial][SIZE=3] A domestic downsize now looms and I must rationalise my kit.
    So very reluctantly I offer for sale these Firebottle Valve Monos.
    They were built by Alan Firebottle who is well known and highly regarded on this forum

    They combine the best of valve and solid state and uses a regulated high tension supply powering a super linear triode gain stage to drive a low impedance mosfet output stage.
    This gives a very natural sound

    Valves. PC88 triode and it comes with a set of Mullards as well as a pair of Telefunkens which some might prefer.

    Output 65 watts RMS into 8 ohms

    Now offered at a bargain price

    775.00 collected










    Apologies and acknowledgement to Alan for paraphrasing his info
    Tangerine LP12,Naim Aro, Benz Wood
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  2. #2
    Join Date: Sep 2009

    Location: west mids, UK

    Posts: 2,524
    I'm Phil.

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    beautiful amps which sound very lovely with a schitt freya or schiit saga .
    1]bel canto pre 3 vbs, ice power amps /onkyo sacd, modwright jolida dac
    sonos, . tannoy eaton legacy 2]bel canto pre 3 vbs bc ref s500 marantz sa8005, black ice dsd dac and RFC impulse ta`us , track audio stands

  3. #3
    Join Date: Nov 2015

    Location: Wolverhampton

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    I'm Oliver.

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    What a lot of folk dont realise, is that these are a type of OTL, I can't remember exactly what Alan said to me but they sounded incredibly similar to his big OTL amp and as anyone who heard it will tell you, its wonderful.

    Had the original demo pair of these and they were better than the price suggests.

    Really enjoyable amps, GLWS.

  4. #4
    Join Date: Dec 2008

    Location: Berks

    Posts: 144
    I'm Alan.

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    Quote Originally Posted by Bigman80 View Post
    What a lot of folk dont realise, is that these are a type of OTL, I can't remember exactly what Alan said to me but they sounded incredibly similar to his big OTL amp and as anyone who heard it will tell you, its wonderful.

    Had the original demo pair of these and they were better than the price suggests.

    Really enjoyable amps, GLWS.
    OTL because they have transistors for the output stage so dont need transformers. Different animal to an OTL valve amp. GLWS, would of been on my want list if I hadnt just purchased some monoblocks!
    Modified SB Receiver, SB Touch, Mitchell Alecto Mk2 Upgraded, DCB1 hot rod with BTFSystems LDR and input board, Tannoy XT6F, Pioneer PL550 (thanks Andrew) Various TDA1541 CDP's, too much shit I dont use to list.

  5. #5
    Join Date: May 2014

    Location: Solihull

    Posts: 607
    I'm Martin.

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    Thanks Guys.........but what is OTL ?
    Tangerine LP12,Naim Aro, Benz Wood
    Voyd Valdi AN Arm 1 V2 and Denon MC
    Audiomeca Talisman Highly Modded
    Audiomeca Kreatura &,SW1X DAC1
    Hovland HP100 MC
    SiriuS D100
    Quad FM4,RWA Cassabria + LCD 3
    Wilson Benesch Actors
    Cables by Cardas, Hovland G3 and Yter

  6. #6
    Join Date: Dec 2008

    Location: Berks

    Posts: 144
    I'm Alan.

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    Quote Originally Posted by ovlov854 View Post
    Thanks Guys.........but what is OTL ?
    Output Transformer Less. Valves connected direct, one of the best amps I have ever heard in my life was one of these but they are expensive as they need lots of valves. Read expensive.
    Modified SB Receiver, SB Touch, Mitchell Alecto Mk2 Upgraded, DCB1 hot rod with BTFSystems LDR and input board, Tannoy XT6F, Pioneer PL550 (thanks Andrew) Various TDA1541 CDP's, too much shit I dont use to list.

  7. #7
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 3,774
    I'm Lawrence.

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    Quote Originally Posted by Dawg View Post
    Output Transformer Less. Valves connected direct, one of the best amps I have ever heard in my life was one of these but they are expensive as they need lots of valves. Read expensive.
    But in this case the output devices are MOSFETs so what does OTL mean in this context?

    Sent from my POT-LX1 using Tapatalk

  8. #8
    Join Date: Jan 2009

    Location: Essex

    Posts: 22,195
    I'm openingabottleofwine.

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    Quote Originally Posted by Lawrence001 View Post
    But in this case the output devices are MOSFETs so what does OTL mean in this context?

    Sent from my POT-LX1 using Tapatalk
    These amplifiers are best described as being a hybrid design, using MOSFET output devices driven by a valve. Therefore although they do not use an output transformer, the term OTL does not really apply to these specific amplifier designs; anymore that it would apply to any other amplifier design using solid state output devices.

    (Incidently there are a very few solid-state amplifiers that do use an output transformer: the Quad 510 monoblocks are one such.)
    Barry

  9. #9
    Join Date: Dec 2008

    Location: Berks

    Posts: 144
    I'm Alan.

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    Quote Originally Posted by Lawrence001 View Post
    But in this case the output devices are MOSFETs so what does OTL mean in this context?

    Sent from my POT-LX1 using Tapatalk
    I would not use the term OTL in this context, I was just trying to expand a little on what Oliver said, that Mr Firebottle said they were like an OTL, as I say, completely different animal, the man himself should chime in and explain how they are like an OTL. MOSFETs are meant to be the closest sounding device to a valve and they can be DC coupled to the speaker, a lot of designs do this, I've built and owned a few and I seem to prefer them. Most have at the very least an inductor and a resistor before the speaker outputs to prevent oscillation, depends on the speaker whether that happens and some have a Zobel network, maybe Alan's have nothing, Maybe that's the context Oliver was remembering.
    Modified SB Receiver, SB Touch, Mitchell Alecto Mk2 Upgraded, DCB1 hot rod with BTFSystems LDR and input board, Tannoy XT6F, Pioneer PL550 (thanks Andrew) Various TDA1541 CDP's, too much shit I dont use to list.

  10. #10
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,297
    I'm Alan.

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    There may have been a little more read into the 'OTL like' term, they are certainly OTL like in sound quality.
    As said above the Fets are the most valve like semiconductor but make for a simpler amplifier than using a valve output sage.
    OTL valve amps generally have quite complex power supply circuitry to accommodate all the necessary biasing.
    Firebottle - for the no bottleneck approach.

    I love Hendrix for so many reasons. He was so much more than just a blues guitarist - he played damn well any kind of guitar he wanted. In fact I'm not sure if he even played the guitar - he played music. - Stevie Ray Vaughan

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