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Thread: MP EL84 Principino class A valve amplifier

  1. #1
    Join Date: Jun 2013

    Location: Gloucestershire, UK

    Posts: 447
    I'm Robert.

    Default MP EL84 Principino class A valve amplifier

    MP EL84 Principino class A valve amplifier

    Link here- hand made in Italy, super rare (interesting website):
    http://www.mpamplificatorivalvolari.it/push-pull-el-84

    One for sale is an older version by the look of the internals and valve locations. Mine has some decent upgrades as mentioned below.

    According to their website:
    Ultra-linear Push-Pull with EL84 class A
    Based on the LEAK 20 schematic
    15W output 8 ohms
    10Hz-30Khz frequency response
    Bartolucci transformers (supposed to be very good and specifically designed for this circuit)

    Amp has superb bass and slam. Lovely sweet sound, very revealing.
    Upgrades to this unit:
    1) Coupling caps are Mundorf ZN and RelCap Teflon/tin - very expensive
    2) Binding posts by Jensen
    3) RCA’s by CMC but with a true 24ct gold plate (soft, not hard plated with nickel)
    4) IEC is a ACME Audio silver plated type and cryo treated
    5) Selector switch is now an Elma type with gold pins
    6) Rectifier tube is supposedly a high spec 5U4G from the Soviet Military, which I imported from the US of all places.

    Bad bits:
    Some blemishes to the light oak chassis - still looks amazing though.
    Amp comes with no bottom cover (comes like this). Just means one could grab the amp from underneath and get a nice shock. I’ve avoided it but just so you are aware.
    While the amp sounds amazing, it is not the quietest amp I’ve come across (low noise speaker hum as with some tube gear). But once the bass starts kicking and highs do their sparkling trick, it is more than forgiven ��
    Selector switch moves to 3 locations but there are only 2 inputs. Selector switch can be removed and the plug moved to accommodate this but I’ve been lazy and it never bothered me.

    Bespoke well made packaging for it (but just a box). Tubes have low hours, maybe 120 hours on them.

    Collection with demo preferred but I will post.

    Priced to sell. I’ve got a valve pre and power combo as well as a new amp on the way so this amp will get little use now - needs must. A lovely and very rare piece.

    750 incl post. 730 collected.
    These retail for 1995 Euro.







    Last edited by Open Door; 12-09-2019 at 23:15. Reason: Photo corrections

  2. #2
    Join Date: Jun 2017

    Location: Co Antrim,Northern Ireland

    Posts: 96
    I'm Norman.

    Default

    Hi, quick question. Current model appears to use Blue Alps, could you clarify what fulfills this role in the one you have for sale ?
    Thanks, Norman

    Sent from my SM-G390F using Tapatalk
    Rosewood LP12 Lingo, Ittok LVIII, AT OC9/III, Pioneer N-50A Streamer, Beresford Caimen SEG, Yamaha CD-N301 CD/ Streamer.Puresound T10 & P10, Audio Synthesis Passion Ultimate passive preamp, Audio Synthesis Decade amp. Canor TP10 Headphone amp. Pair MF P150 amps
    Linn Keildh, Hiquphon Tweeter upgrade.With Kustone bases
    Solid core Silver interconnects. Silver plated solid core copper interconnects, KLE Silver and Neutrik plugs and K400 biwire cable. Norstone Bergen 2 table
    Mission Isoplat (anyone remember them?)Synology DS215 , Beyerdynamic DT 990's, ADL GT40 Alpha for ADC Duties.

  3. #3
    Join Date: Jun 2013

    Location: Gloucestershire, UK

    Posts: 447
    I'm Robert.

    Default

    It has an Alpha pot.
    Pot casing is linked to the grounding circuit so not sure another pot can be used (shielding).

  4. #4
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 1,039
    I'm Dennis.

    Default

    Having built numerous similar amps in the 70s, and gained a reputation for building 'no noise' amps, I think a little tidying up and maybe judicious application of screening could possibly reduce that.

    The 'carve marks will probably be obscured with a little polyurethane varnish.

  5. #5
    Join Date: Sep 2013

    Location: Wilts

    Posts: 105
    I'm Richard.

    Default

    Knowing Robert very well, he will always describe every flaw, however tiny. He is a very generous and kind authority who if anything will make an item sound worse than it really is. So anyone interested can buy with total confidence and with the assurance that any flaws described will probably be very hard to spot.

  6. #6
    Join Date: Jun 2013

    Location: Gloucestershire, UK

    Posts: 447
    I'm Robert.

    Default

    Let’s male it appealing ��

    If unsure or tempted, bring your speakers around to demo.

    600

  7. #7
    Join Date: Jun 2017

    Location: Co Antrim,Northern Ireland

    Posts: 96
    I'm Norman.

    Default

    Morning Robert, am giving a bit of thought to this amp. Need a little bit more info, what makes of valves are currently fitted and what finish is the metal body, brushed stainless; polished stainless etc
    Thanks, Norman

    Sent from my SM-G390F using Tapatalk
    Rosewood LP12 Lingo, Ittok LVIII, AT OC9/III, Pioneer N-50A Streamer, Beresford Caimen SEG, Yamaha CD-N301 CD/ Streamer.Puresound T10 & P10, Audio Synthesis Passion Ultimate passive preamp, Audio Synthesis Decade amp. Canor TP10 Headphone amp. Pair MF P150 amps
    Linn Keildh, Hiquphon Tweeter upgrade.With Kustone bases
    Solid core Silver interconnects. Silver plated solid core copper interconnects, KLE Silver and Neutrik plugs and K400 biwire cable. Norstone Bergen 2 table
    Mission Isoplat (anyone remember them?)Synology DS215 , Beyerdynamic DT 990's, ADL GT40 Alpha for ADC Duties.

  8. #8
    Join Date: Jun 2013

    Location: Gloucestershire, UK

    Posts: 447
    I'm Robert.

    Default

    Hi Norman

    Tubes are:
    New issue Sovtek EL84’s (x4)
    3x new issue Sovtek 7025 / 12AX7

    I’ll include a Pearl Tube Cooler / Dampener for the preamp tube.

    Finish, is stainless steel, more brushed than polished. Sort of a dull finish. I’ve tried to take a photo as below.






    Quote Originally Posted by Stormin'Norman View Post
    Morning Robert, am giving a bit of thought to this amp. Need a little bit more info, what makes of valves are currently fitted and what finish is the metal body, brushed stainless; polished stainless etc
    Thanks, Norman

    Sent from my SM-G390F using Tapatalk
    Last edited by Open Door; 15-09-2019 at 10:23. Reason: Photo

  9. #9
    Join Date: Jan 2008

    Location: Forest of Dean, Glos

    Posts: 11,424
    I'm Jerry.

    Default

    Oooo, I love el84 amps. But I already have one.
    My favourite power tube, so natural, just yummy.

    GLWS.
    Jerry

    i. Qobuz internet streaming > Audiobyte Black Dragon DAC > Marantz HD-AMP1 > MBL 116F speakers
    Cables : Wyreworld Starlight USB, Epiphany Atratus III interconnect, Tellurium Q Silver speaker.
    USB signal pampering : Wired4Sound Recovery & Halide Bridge.
    Headphones : Beyerdynamic DT 250

    ii Internet streaming > Audiolab MDAC > Marantz HD-AMP1 > Infinity Cascade 9 speakers & Jamo SUB200

  10. #10
    Join Date: Jun 2017

    Location: Co Antrim,Northern Ireland

    Posts: 96
    I'm Norman.

    Default

    One more question ! On the schematic posted on manufacturer's web site it shows 3 trappings possible to suit speaker impedance. It's not immediately clear how to do this as wiring pics are quite different, any info appreciated because my speakers would need 4 Ohm tap.
    Regards
    Norman

    Sent from my SM-G390F using Tapatalk
    Rosewood LP12 Lingo, Ittok LVIII, AT OC9/III, Pioneer N-50A Streamer, Beresford Caimen SEG, Yamaha CD-N301 CD/ Streamer.Puresound T10 & P10, Audio Synthesis Passion Ultimate passive preamp, Audio Synthesis Decade amp. Canor TP10 Headphone amp. Pair MF P150 amps
    Linn Keildh, Hiquphon Tweeter upgrade.With Kustone bases
    Solid core Silver interconnects. Silver plated solid core copper interconnects, KLE Silver and Neutrik plugs and K400 biwire cable. Norstone Bergen 2 table
    Mission Isoplat (anyone remember them?)Synology DS215 , Beyerdynamic DT 990's, ADL GT40 Alpha for ADC Duties.

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