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  • Conrad-Johnson Announces Update to TEA-1 Phono Section

    Click image for larger version  Name:	IMG_2854.JPG Views:	1 Size:	28.4 KB ID:	37143



    TEA1 Series 2 Phono Preamplifier

    The TEA1 Series 2 triode equalization amplifier is a stand-alone vacuum-tube phono stage designed to satisfy the expectations of the most demanding music lovers.

    The TEA1s2 features a zero loop feedback circuit with passive RIAA equalization. It offers two phono inputs, one with switch selectable resistive and capacitive loading allowing the user to fine-tune performance to the chosen phono cartridge. The other input is fitted with premium wide-bandwidth audio transformers installed on the PHONO 1 input to provide the higher gain and very low noise required by low output moving coil cartridges. Designed to precisely track the prescribed RIAA equalization curve, the TEA-1s2 assures absolute tonal accuracy. The low-gain audio circuit of the TEA-1s2 is comprised of two cascaded single-ended triode amplifiers. The circuit is a zero-feedback design, to eliminate the temporal inaccuracies that negative feedback introduces. RIAA equalization is established by a passive network between the two gain stages. Careful implementation of this fundamentally simple circuit results in extremely wide bandwidth and low distortion, without resorting to negative feedback.

    The ideal dc power supply circuit is simply a zero impedance path to ground.

    Any deviation from this ideal is fully reflected in the audio circuits. Thus the power supplies are as important to audio performance as the audio circuits and must be accorded equal attention in design. In the TEA-1s2, each stage has its own discrete regulated DC power supply. These power supplies have been carefully designed for minimum impedance, even at the highest audio frequencies, to prevent the power supplies from degrading music reproduction.
    The TEA1s2 is optionally available as the TEA1s2b with the step-up transformers deleted. This version of the TEA1s2 has two direct inputs, one with variable loading and one with fixed loading.

    The full potential of any circuit design can only be realized if executed with the highest quality parts.

    The audio circuits of the TEA-1s2 use only conrad-johnson’s proprietary Teflon capacitors. In the power supplies, all capacitors are polypropylene or Teflon – there are no electrolytic capacitors anywhere in the audio circuits or their dc power supplies. The audio circuits and related power supplies both use high-precision laser trimmed metal-foil resistors, designed for ultra-low inductance. All parts in the RIAA compensation network are 1% tolerance, to assure precise tracking of the RIAA curve. Input and output connectors are gold-plated, machined oxygen free copper. Even the hookup wiring has been carefully selected for optimal audio performance. Thoughtful engineering, specification of the finest available component parts, and painstaking care taken in production make the TEA-1s2 a phono equalization preamplifier without peer in music reproduction.

    Specifications

    Peformance specifications measured at 1 kHz

    Gain: TEA1s2

    Low Gain Input – 54 dB

    High Gain Input – 66 dB Gain:

    TEA1s2b


    Both Inputs – 54 dB

    Overload TEA1s2

    Low Gain – 50 mV
    High Gain – 12 mV

    Overload TEA1s2b

    Both Inputs – 50 mV

    Hum and Noise

    Direct Inputs – 80 dB below 10 mV input
    High Gain (TEA1s2 only) 72 dB below 1 mV input

    Phase

    phase correct

    Input Impedance TEA1s2

    Low Gain Input variable, 130 Ohms – 47 kOhms
    High Gain Input 420 Ohms Input Impedance

    Input Impedance TEA1s2b

    Variable Load Input 130 Ohms – 47 kOhms
    Fixed Load Input 47 kOhms

    Output Impedance

    below 200 ohms

    Dimensions

    15.5″D x 19″W x 3.315″H

    Net Weight

    23 lbs.

    Now available for immediate delivery, the TEA1s2 has a US Suggested Retail Price of $15,000 and $12,000 for the TEA1s2b
    Myles B. Astor, PhD, Administrator
    Senior Editor, Positive-Feedback.com
    ________________________________________

    -Zellaton Plural Evo speakers
    -Goldmund Telos 300 stereo amp
    -Goldmund Mimesis 37S Nextgen preamplifier
    -Doshi EVO and Goldmund PH3.8 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 Mk. 2, 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. 6, 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 3 racks, Audiodharma Cable Cooker, Symposium Ultra and assorted SRA OHIO Class 2.1+ platforms.

  • #2
    I have always liked CJ Phonostages. Currently have a CJ Tea2 SE. Sounds very good and is nicely quiet for a vacuum tube phono. With 55db gain, my Tea2 SE kind of limits some of my cartridge options. When done paying for kid's school, will be looking to upgrade.

    The new CJ Tea1 or Lamm Lp2.1 would be nice upgrade options. With either, tough call to use their high gain stage or use their low gain & good external SUT like Ypsilon. Tea1 would have synergy with my CJ preamp. I like Lamm products and the LP2.1 price point is more attractive. Tough call. Got alot of time & limited cash flow to figure this out.
    CJ Gat, Lamm ML1.1, CJ Tea1 S3 phono, TW Acoustics Raven AC, Tri-Planer MK Vll SE, Vdh Crimson Stradivarius, Exemplar Modded 205(Tube Version), Rockport Avior ll Speakers, Shunyata Denali 6000t,Triton V3, Shunyata Python Zitron IC's & Sigma Speaker Cables. Shunyata Sigma Power Cables, Audio Desk Pro LP Cleaner, Stillpoints, Stillpoints Aperture Panels & MG Corner Tunes.

    Comment


    • #3
      I loved my TEA 1bc. The cj phonostage really resolved the sense of space like few other phono sections. And wonderfully dimensional.

      Just didn't have enough gain for me when I went to the less sensitive, 1.8 V, ART. In fact, one of the last pure, all tube phono sections.
      Myles B. Astor, PhD, Administrator
      Senior Editor, Positive-Feedback.com
      ________________________________________

      -Zellaton Plural Evo speakers
      -Goldmund Telos 300 stereo amp
      -Goldmund Mimesis 37S Nextgen preamplifier
      -Doshi EVO and Goldmund PH3.8 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 Mk. 2, 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. 6, 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 3 racks, Audiodharma Cable Cooker, Symposium Ultra and assorted SRA OHIO Class 2.1+ platforms.

      Comment


      • #4
        How much better do you think the Tea1s2 would be then my current CJ Tea2 SE? I am guessing a much larger power supply would give it more heft in bass. All those Teflon caps will be a killer to break in. Should help with detail and information retrieval. With the low gain stage having no step up, I am guessing the signal would be more pure on the low gain input. Probably limits cartridge options to .8 Mv or higher.

        CJ Tea1s2 would mate better with my Conrad GAT. To cloud the issue, I have a Lamm Amp. Its a little older ML1.1 90 watt push pull. I have heard the LP2.1 phono stage is very good.

        Quick question. The input sensitivity of my Lamm is 1.2 V. Your Art is 1.8V. Does that mean you Art will more efficient at signal gain then my Lamm? I would guess as much. Thanks for your time & effort!
        CJ Gat, Lamm ML1.1, CJ Tea1 S3 phono, TW Acoustics Raven AC, Tri-Planer MK Vll SE, Vdh Crimson Stradivarius, Exemplar Modded 205(Tube Version), Rockport Avior ll Speakers, Shunyata Denali 6000t,Triton V3, Shunyata Python Zitron IC's & Sigma Speaker Cables. Shunyata Sigma Power Cables, Audio Desk Pro LP Cleaner, Stillpoints, Stillpoints Aperture Panels & MG Corner Tunes.

        Comment


        • #5
          Originally posted by Hawk View Post
          How much better do you think the Tea1s2 would be then my current CJ Tea2 SE? I am guessing a much larger power supply would give it more heft in bass. All those Teflon caps will be a killer to break in. Should help with detail and information retrieval. With the low gain stage having no step up, I am guessing the signal would be more pure on the low gain input. Probably limits cartridge options to .8 Mv or higher.

          CJ Tea1s2 would mate better with my Conrad GAT. To cloud the issue, I have a Lamm Amp. Its a little older ML1.1 90 watt push pull. I have heard the LP2.1 phono stage is very good.

          Quick question. The input sensitivity of my Lamm is 1.2 V. Your Art is 1.8V. Does that mean you Art will more efficient at signal gain then my Lamm? I would guess as much. Thanks for your time & effort!
          Last question first. The lower the number, the more efficient so to speak. My earlier cj amps were 0.5 V to rated power and I could run the low output ZYX with no issue. Then got the ART and could do that no longer. Of course, cj says that the ART amps have less noise because of the 1.8 V to rated power.

          Anything on my part would be guessing but a bigger PS and more Teflon caps should be better. Certainly dynamics and dynamic swings. You can get something like that Granite Audio reverse RIAA CD to break in the phonostage.

          I would think you could use 0.5 mV or better. Think with all tubes you have 54 plus 25 dB of gain.
          Myles B. Astor, PhD, Administrator
          Senior Editor, Positive-Feedback.com
          ________________________________________

          -Zellaton Plural Evo speakers
          -Goldmund Telos 300 stereo amp
          -Goldmund Mimesis 37S Nextgen preamplifier
          -Doshi EVO and Goldmund PH3.8 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 Mk. 2, 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. 6, 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 3 racks, Audiodharma Cable Cooker, Symposium Ultra and assorted SRA OHIO Class 2.1+ platforms.

          Comment


          • #6
            Thanks Myles! Learning all sorts of new thing on this site.
            CJ Gat, Lamm ML1.1, CJ Tea1 S3 phono, TW Acoustics Raven AC, Tri-Planer MK Vll SE, Vdh Crimson Stradivarius, Exemplar Modded 205(Tube Version), Rockport Avior ll Speakers, Shunyata Denali 6000t,Triton V3, Shunyata Python Zitron IC's & Sigma Speaker Cables. Shunyata Sigma Power Cables, Audio Desk Pro LP Cleaner, Stillpoints, Stillpoints Aperture Panels & MG Corner Tunes.

            Comment


            • #7
              Phase

              phase correct
              Hmmmm.... When did this happen?

              Comment


              • MylesBAstor
                MylesBAstor commented
                Editing a comment
                The only cj products that one needed to invert leads for are the preamps.

              • Guest's Avatar
                Guest commented
                Editing a comment
                I have such a strong association of preamps with phonostages for CJ (as your other post suggested) I never imagined one would be different than the other. I suppose I should stop using my PV-8 as the archetype. :-o

            • #8
              It doesn't say whether the pwr supply is ss or tube.
              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-650 Headphones, Headroom Max Balanced Headphone Amp, DIY Silver Interconnects

              Comment


              • #9
                Originally posted by JCOConnell View Post
                It doesn't say whether the pwr supply is ss or tube.
                conrad-johnson hasn't used tube PS/rectification since the Premier 2. The adoption of a solid-state power was one of the biggest changes in the Premier 3 and responsible in part for the improvement in sound over its predecessor.

                Tube set for Premier 2: V1 & V2: 12AX7 | V3, V4, V6, V7, & V8: 5751 | V5 & V9: 5965 | V10: 12X4
                Myles B. Astor, PhD, Administrator
                Senior Editor, Positive-Feedback.com
                ________________________________________

                -Zellaton Plural Evo speakers
                -Goldmund Telos 300 stereo amp
                -Goldmund Mimesis 37S Nextgen preamplifier
                -Doshi EVO and Goldmund PH3.8 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 Mk. 2, 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. 6, 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 3 racks, Audiodharma Cable Cooker, Symposium Ultra and assorted SRA OHIO Class 2.1+ platforms.

                Comment

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