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tubed

tubed two channel preamplifiers

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  • Convergent Audio Technology SL1 Legend/ BLACK PATH EDITION with Phono

    Convergent Audio Technology SL1 Legend/ BLACK PATH EDITION with Phono

    The SL1 Legend takes this uncompromising approach further than the product with which Ken literally started the company, the SL1 preamp, now in its Renaissance version. The two use essentially the same circuit, but in the case of the Legend that circuit is taken to the extreme -- it's a cost-no-object implementation. On the outside, the two look nearly identical, but there are a couple of notable differences. Chief among these is the use of dual volume controls in the Legend instead of separate volume and balance. Both preamps use stepped volume controls, essentially a set of resistors for each setting, but the Legend's 46-position shunt volume controls are more costly than those used for the standard SL1, whose fewer positions cause issues for some owners, as the perfect volume setting can sometimes lie between two "clicks." Not with the Legend; 46 positions should be enough for even the pickiest listeners. Learn More
    $29,990.00

  • Convergent Audio Technology SL1L Legend/ BLACK PATH EDITION w/o Phono

    Convergent Audio Technology SL1L Legend/ BLACK PATH EDITION w/o Phono

    The SL1 Legend takes this uncompromising approach further than the product with which Ken literally started the company, the SL1 preamp, now in its Renaissance version. The two use essentially the same circuit, but in the case of the Legend that circuit is taken to the extreme -- it's a cost-no-object implementation. On the outside, the two look nearly identical, but there are a couple of notable differences. Chief among these is the use of dual volume controls in the Legend instead of separate volume and balance. Both preamps use stepped volume controls, essentially a set of resistors for each setting, but the Legend's 46-position shunt volume controls are more costly than those used for the standard SL1, whose fewer positions cause issues for some owners, as the perfect volume setting can sometimes lie between two "clicks." Not with the Legend; 46 positions should be enough for even the pickiest listeners. This item is without phono Learn More
    $27,990.00

  • Conrad Johnson ET6 Linestage, vacuum-tube

    Conrad Johnson ET6 Linestage, vacuum-tube

    ET6/ET6SE Vacuum Tube Preamplifiers At conrad-johnson, development of our flagship products has traditionally led to important enhancements of our entry-level offerings. The ET6 preamplifier is a case in point. The ET6 line-stage is a “baby” version of our flagship line-stage preamplifier, the GAT. The family resemblance is much more than skin deep. With voltage gain provided by a triode vacuum-tube, the zero-feedback line-stage circuit of the ET6, along with its DC voltage regulators, closely replicates the circuit of the GAT. Finally, and especially noteworthy, the ET6 features a relay operated discrete stepped attenuator level-control circuit of the type found in the GAT and ET7, absent only the balance control function found in those more costly models. Functionally, the ET6 provides highly flexible I/O facilities with six separate line-level inputs (including one “tape” loop), plus a theater loop that facilitates use in a home theater system. In addition, the ET6 offers the convenience of infrared remote control of all functions. Learn More
    $4,250.00

  • Conrad Johnson ET6 with phono stage, vacuum-tube

    Conrad Johnson ET6 with phono stage, vacuum-tube

    For vinyl enthusiasts, the ET6 is optionally available with a vacuum-tube phono stage that borrows its zero-feedback audio circuit from our reference quality TEA1-S3 phono stage. Customers can choose between high gain (recommended for cartridges with a rated output of 1.0 mV or less) and low gain (recommended for cartridges with rated output greater than 1.0 mV) versions of the phono stage. Input resistive loading is switch selectable over a range from 47 kOhms down to 200 Ohms. The ET6 phono stage is built to the same high quality standard found in the ET6 line-stage. ET6 Optional Phono Stage•High Gain Version 54dB •Low Gain Version 40dB •RIAA Equalization: +/- .25 db 20Hz to 20kHz •Hum and Noise: -80dB relative to 10mV input •Phase: phase correct •Tube Compliment: High Gain Version 3x 12AX7 Low Gain Version 2x 12AX7, 1x 12AU7 Learn More
    $5,540.00

  • Conrad Johnson ET6SE with SE phono stage, vacuum-tube

    Conrad Johnson ET6SE with SE phono stage, vacuum-tube

    ET6/ET6SE Vacuum Tube Preamplifiers At conrad-johnson, development of our flagship products has traditionally led to important enhancements of our entry-level offerings. The ET6 preamplifier is a case in point. The ET6 line-stage is a “baby” version of our flagship line-stage preamplifier, the GAT. The family resemblance is much more than skin deep. With voltage gain provided by a triode vacuum-tube, the zero-feedback line-stage circuit of the ET6, along with its DC voltage regulators, closely replicates the circuit of the GAT. Finally, and especially noteworthy, the ET6 features a relay operated discrete stepped attenuator level-control circuit of the type found in the GAT and ET7, absent only the balance control function found in those more costly models. Functionally, the ET6 provides highly flexible I/O facilities with six separate line-level inputs (including one “tape” loop), plus a theater loop that facilitates use in a home theater system. In addition, the ET6 offers the convenience of infrared remote control of all functions. For vinyl enthusiasts, the ET6 is optionally available with a vacuum-tube phono stage that borrows its zero-feedback audio circuit from our reference quality TEA1-S3 phono stage. Customers can choose between high gain (recommended for cartridges with a rated output of 1.0 mV or less) and low gain (recommended for cartridges with rated output greater than 1.0 mV) versions of the phono stage. Input resistive loading is switch selectable over a range from 47 kOhms down to 200 Ohms. The ET6 phono stage is built to the same high quality standard found in the ET6 line-stage. Premium quality component parts are specified to optimize performance and to sustain that performance for years to come. Precision, metal-film resistors yield low noise performance for greatest clarity. Polypropylene capacitors, used exclusively in the audio circuits and the regulated plate voltage supplies, offer extraordinary temporal accuracy. In fact, the ET6 is built to standards that meet or exceed those of many companies’ “flagship” offerings. Those who wish to take the performance to yet a higher level will be thrilled by the availability of an upgraded “SE” version. The ET6SE boasts CJD Teflon capacitors and metal foil resistors in critical circuit applications. It would be fair to say that the only thing “entry-level” about the ET6 is its price. Arrange to audition one at a conrad-johnson dealer to find out for yourself – you’ll be surprised at just how affordable true high-end performance can be. Learn More
    $7,500.00

  • Conrad Johnson ET7 S2 line stage, vacuum-tube

    Conrad Johnson ET7 S2 line stage, vacuum-tube

    Excellent condition, all packing. We are CJ dealers ET7-S2 Enhanced-Triode Preamplifier The ET7-S2 enhance triode line-stage preamplifier has been designed to incorporate the advances made with the Series 2 upgrade to our flagship GAT into a more affordable model. The circuitry of the ET7-S2 follows closely that of the GAT Series 2. The audio circuit is elegant in its simplicity. An audio amplifier stage consisting of a single-ended triode amplifier provides the voltage gain. This amplifier stage is connected to the preamplifier outputs through a high-current MOSFET buffer, which achieves a very low output impedance, making the ET7-S2 extremely flexible in the choice of interconnect cables and amplifiers. DC voltage is supplied to the circuit by the revised discrete voltage regulator developed for the GAT Series 2. It isolates the audio circuit from the power line by maintaining negligible impedance across the audio frequency band. Infra-sonic noise is minimized by operating the tube filaments (heaters) on a dc voltage supplied by a separate regulated power supply. The ET7-S2 also boasts the GAT’s convenience and ease of use. The unit features input selection and level adjustment by microprocessor-controlled relays, with controls available both at the front panel and via a full-function remote. All control functions of the ET7-S2 operate through microprocessor-controlled relays. For the level control, the relays select combinations from a network of precision, low-noise metal foil resistors to effect loudness and balance changes in 100 steps of approximately .7dB per step. All switching and adjustment can be controlled by the unit’s remote control. A Theater Mode, which passes the input signal through at unity gain, makes it simple to incorporate the ET7-S2 into a high quality home theater system without compromising its two-channel performance. Like its bigger brother, the GAT Series 2, the ET7-S2 is constructed from the highest quality, carefully selected parts for unrivaled sonic performance and reliability. Tubes have been selected for minimum noise and microphonics. CJD Teflon capacitors are used in the ET7-S2 for output coupling and post-regulator power supply storage. In the power supplies, all capacitors are of polypropylene or Teflon—there are no electrolytic capacitors anywhere in the audio circuits or their DC power supplies. The resistors in these circuits (including the two dozen level control resistors) are special low inductance, high-precision laser-trimmed metal foil resistors. Switches are sealed relays with gold-plated silver contacts. Input and output connectors are machined from oxygen-free copper, and are gold plated. For four decades, the conrad-johnson design team has been dedicated to creating audio components that do credit to music performances. Through meticulous engineering, careful specification of only the finest available component parts, and a painstaking attention to construction, we have created what we feel is a line-stage without rival in its class. We invite you to arrange an audition of the ET7-S2 with your conrad-johnson dealer to experience the extraordinary musical performance of this remarkable preamplifier. Learn More
    $8,000.00

  • Conrad Johnson TEA1 S3 Phono-Stage

    Conrad Johnson TEA1 S3 Phono-Stage

    TEA1 Series 3 Phono Preamplifier The TEA1 Series 3 triode equalization amplifier is a stand-alone vacuum-tube phono stage designed to satisfy the expectations of the most demanding music lovers. The TEA1s3 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-1s3 assures absolute tonal accuracy. The low-gain audio circuit of the TEA-1s3 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-1s3, 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 TEA1s3 is optionally available as the TEA1s3b with the step-up transformers deleted. This version of the TEA1s3 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-1s3 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. The casework features black anodized aluminum, brushed-polished, sides and ventilated top cover. Thoughtful engineering, specification of the finest available component parts, and painstaking care taken in production make the TEA-1s3 a phono equalization preamplifier without peer in music reproduction. We invite you to arrange an audition with your conrad-johnson dealer to confirm for yourself the extraordinary musical performance of these products. Learn More
    $11,500.00

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