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What Output Tubes Go Through Before Using at ARC

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  • What Output Tubes Go Through Before Using at ARC

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    Splendor in the Glass…

    Before receiving your new Audio Research tube amplifier, the power output vacuum tubes are subject to a full 48-hour burn-in as seen in the accompanying photo. The tubes are then carefully graded on a custom tube fixture we built in-house, carefully matched based on several proprietary numeric parameters and installed in the amps for another 48 hours of burn-in to further stabilize them. Each amp is carefully tested for proper operating points including bias, distortion minimization, power output, noise level and bandwidth. The amp is then hooked up to a system, warmed up and evaluated playing music. Once it passes sonic evaluation, falling within an extremely tight window of sonic acceptability, it is sent back to the QA department for a final bench inspection before being paneled, physically inspected and finally packaged for shipment.

    Great tube amps take time to design, build, test and listen to. No one else builds amps that go through more rigorous testing before they get to your listening room for a lifetime of enjoyment.

    The tubes we select for each product reflect our desire to constantly be on the cutting edge of vacuum tube performance. Witness the most recent KT150 output tubes we were at the lead in adopting. But only after being stringently evaluated for sonic performance, reliability, consistency and availability.

    Yes, tubes rule. But the best tubes break the rules, push performance boundaries and set the tone going forward.
    Myles B. Astor, PhD, Administrator
    Senior Editor, Positive-Feedback.com
    ________________________________________

    -Magico S5 Mk.2 speakers with SPod feet
    -Goldmund Telos 280 stereo amp
    -Goldmund Mimesis 37S Nextgen preamplifier
    -Doshi V3.0 phonostage
    -VPI Vanquish direct-drive turntable
    -VPI 12-inch 3D Fat Boy dual pivot tonearm, VPI 12-inch 3D Fat Boy gimballed and SAT LM-12 arm
    -Lyra Atlas SL Lambda, Fuuga, vdh Colibri Master Signature, MutechHayabusa, MOFI Master Tracker, Sumiko Songbird cartridges
    -Technics RS1506 with Flux Magnetic heads, Doshi V3.0 tape stage (balanced)
    -Assorted cables including Transparent XL Gen. 5, Skogrand, Viero, Kubala-Sosna, Audience Au24SX, Genesis Advanced Technologies and Ensemble Power Cords
    -Accessories including Stillpoint Aperture panels, Cathedral Sound panels, Furutech NCF Nano AC receptacles; Silver Circle Tchaik 6 PLC, Symposium ISIS and SRA Craz racks, Audiodharma Cable Cooker, Symposium Ultra and assorted SRA platforms.

  • #2
    I love my ARC Ref 75 and Ref 6.
    Micro Seiki SX-8000 table with flywheel, SME 3012R arm, SME 312S arm, Lyra Etna SL and Dynavector XV-1S cartridges, ARC Ref 3 phono stage, Otari MX-55 tape deck, Ampex 350 repros, Roon Nucleus Plus server, PS Audio DSJ DAC, ARC Ref 6 pre, ARC Ref 75 amp, JBL 4345 speakers, and Def Tech Ref subs.

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    • #3
      I think you left the word tubes out of the thread title
      Magnepan 1.6 QR Loudspeakers, Amherst A-2000 MOSFET 150 WPC Amp, Conrad Johnson PV-10A Modded Tube Line & Phono Stage, Electrocompaniet MC II Class A Head Amp, Audio Technica AT-OC9XML Cart (Stereo) , Graham Engineering 2.2 Tonearm (Stereo) , VPI Aries-1 Turntable (Stereo) , VPI Clamp, Denon DL-102 Cart, (Mono) , Luxman Tonearm (Mono) , Kenwood KD-500 Turntable (Mpmp) , Michell Clamp, Marantz 20B Analog FM Tuner, Pioneer SACD, Onkyo DX-6800 CD Transport, DIY 24B/192K DAC, Sennheiser HD-300 Headphones, Headroom Max Balanced Headphone Amp, DIY Silver Interconnects

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      • #4
        What brand tubes are they using ? Tungsol ?
        analog stuff.
        otari mtr 10 2 track 1/4 made new by soren
        otari mtr 10 2 track 1/4 1/2 combo made new by soren
        sota sapphire used eminent tech ver 2 arm
        new sota nova table has magnetic levitation platter and full speed control and latest motor same arm as above
        thorens td124 sme ver 2 arm
        thorens td125 sme ver 2 arm
        kenwood direct drive sme ver 2 arm
        phono preamp Ml no 25 all re capped
        speakers cust infinity IRS V , new caps and LPS , magnets etc.
        mark levivson pre no 26 amps no 33
        digital three cust servers , win ser 2016 , AO
        Dacs lampi various

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        • tom_hankins
          tom_hankins commented
          Editing a comment
          I think they're the only one who makes the kt150 tube.

      • #5
        KT150, it has become my favorite tube of all time. Beautiful balance, dynamics and great power. I've always admired Mullard EL34 and Tung Sol and (original) Svetlana KT88 and 6550 but this new design has it all.

        I had them in Audio Research REF 250, Eico HF60s and the new Allnic M5000. I began with KT120 in the ARC and (original USA) Tung Sol in the Eico. The Allnic comes with KT150, just as ARC does now.

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        • #6
          I too am a big fan of the KT-150 tube. I switched over to the KT-150s shortly after I bought my Ref 75 amp and have had zero desire to try any other output tubes. Installing the KT-150s is akin to getting an upgrade on the order of purchasing a new and better component.
          Micro Seiki SX-8000 table with flywheel, SME 3012R arm, SME 312S arm, Lyra Etna SL and Dynavector XV-1S cartridges, ARC Ref 3 phono stage, Otari MX-55 tape deck, Ampex 350 repros, Roon Nucleus Plus server, PS Audio DSJ DAC, ARC Ref 6 pre, ARC Ref 75 amp, JBL 4345 speakers, and Def Tech Ref subs.

          Comment


          • #7
            Originally posted by mep View Post
            I too am a big fan of the KT-150 tube. I switched over to the KT-150s shortly after I bought my Ref 75 amp and have had zero desire to try any other output tubes. Installing the KT-150s is akin to getting an upgrade on the order of purchasing a new and better component.
            Agree ! The ARC Ref 250 was improved so much going from KT120 to KT150 it was like a different amp or at least a different design.

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