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Conrad Johnson
In the mid-seventies, two economists, friends and serious audiophiles - Dr. William Conrad and Dr. Lewis Johnson - were highly dissatisfied with the commercially available equipment of the time and were also perplexed and challenged by the readily apparent sonic differences among components in their own systems. What made these two classic tube systems sound so different? Could the virtues of each be somehow combined? Not content to merely speculate on such issues, conrad and johnson decided to systematically investigate by developing and refining a vacuum-tube preamplifier.

The resulting conrad-johnson preamplifier was immediately recognized as a state of the art contender and catapulted Conrad and Johnson into the audio industry.

The most important legacy of conrad-johnson design's beginnings is the basic methodology which took shape in the course of the development of that first preamplifier. This methodology has enabled Conrad and Johnson to develop new products which have routinely been ranked among the most musically satisfying. Few other manufacturers have so consistently received such high praise for their products.

Key Product Introductions
1977 - conrad-johnson preamplifier: this all tube preamplifier, later named the PV1, immediately established conrad-johnson as a significant player in the high-end audio arena.
1978 - MV75: (our first power amplifier). The success of this product did much to ensure the long term viability of conrad- johnson design.
1979 - Premier One: a high power 200 watt per channel all tube power amp, and conrad-johnson's first "state of the art" product. In the 10th Anniversary issue of The Absolute Sound Magazine, the Premier One was credited with being the finest sounding amplifier of that decade.
1983 - Premier Three: Absolute Sound named this all-tube preamp the best sounding preamp of the decade.
1983 - PV5: a highly successful all-tube preamplifier that found its way into the reference systems of many reviewers of the time.
1985 - MC7: under our motif brand name, the MC7 established our credentials as designers of high-end solid-state products. Solid- state products have since become a lasting and important part of conrad-johnson's line.
1986 Sonographe SD1: this low priced cd player was widely re- garded to be the equal of the most expensive cd players at that time. It marked the company's entry into digital products.
1988 Premier Seven: a full featured dual-mono preamplifier, the Premier Seven was labeled the best in the world by prominent reviewers.
1992 Premier Eight: an all tube 275 watt mono amp maintains conrad-johnson's claim to state of the art performance in amplifiers.
1997 - Anniversary Reference Triode Preamplifier (ART): this all tube line-stage preamplifier has been identified as the best sounding line-stage available by many of the industries most prominent reviewers.
Design Philosophy
The sole legitimate function of a stereo system, from modest to state of the art, is to enable the listener to enjoy the emotional experience of music performances. conrad-johnson's R&D efforts are concentrated on developing audio components which offer increasingly exact recreation of live music performances without interfering with the enjoyment of the music. This pursuit demands dedication and a genuine love of music that is impossible to hire, which explains the fact that in those few companies which succeed in producing musically satisfying components, product development is inevitably dominated by one or two individual personalities who are inextricably identified with the company.
 
 
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For The True
Audio

Connoisseur
Amplifiers
LP125sa Vacuum-Tube Stereo Power Amplifier
The latest in the highly regarded series of conrad-johnson vacuum-tube power amplifiers, the LP125sa represents a compelling combination of the audio excellence one expects from conrad-johnson, the convenience of a single stereo chassis, and, at 125 watts per channel, sufficient power for the majority of high-end speaker systems. This is an amplifier capable of capturing the delicate textures and subtle nuances of live music while maintaining control with the authority that comes with ample power.

The LP125sa audio circuit consists of three stages. The input signal is amplified by a single-ended triode amplifier designed for wide bandwidth. The signal is then direct coupled to a cathode coupled phase-inverter. This high current, triode phase-inverter stage provides a balanced, low impedance drive to the output stage. Output power is developed by two pairs of KT120s per channel, chosen for their excellent sonic character, high power, and reliability. The output tubes are operated in ultralinear configuration which offers a desirable combination of high power and low distortion. Massive output transformers with intricately interleaved windings afford extended bandpass and high phase linearity. A small amount (about 12 dB) of loop negative feedback reduces distortion and achieves a sufficiently high damping factor to control reactive loudspeaker systems.

Power supply design is every bit as critical to the performance of an audio component as the audio circuit itself. In the LP125sa, separate, low impedance, discrete dc power supply regulators are provided for the input and phase-inverter stages, preventing the output stage from modulating these stages through the power supply.

These amplifiers require no complicated adjustments or specialized equipment to maintain. To assure continued peak performance, the owner need only make a simple bias adjustment when new tubes are installed. Built in LED bias indicators allow the user to make this adjustment using only the supplied screwdriver.
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ART Amplifier ARTsa Vacuum-Tube Power Amplifier
The ART Amplifier is our first limited edition power amplifier, and only the third of these very special limited edition products that we have offered in our more than thirty years in business. It is designed to be a reference amplifier for the use of industry professionals as well as dedicated audiophiles. Like its companion GAT Preamplifier, the ART Amplifier will be offered in an edition of just 250 units (125 pairs) to be sold through selected Conrad-johnson dealers and distributors.

At conrad-johnson, our approach to circuit design is predicated on the principle that the surest path to both state-of-the-art musicality and exceptional reliability is to keep the circuits simple and build them with the finest available parts. The ART amplifier exemplifies this basic principle. The audio circuit has just three elements, each as simple as possible, and each essential to the operation of the amplifier. A voltage gain amplifier (a single triode) is direct-coupled to a cathode coupled phase inverter (each phase handled by a single triode), which in turn drives the output stage. Power is developed by 6550 output tubes, chosen for their musical accuracy, high power, and reliability. Four pairs are used to comfortably and reliably achieve the 275 watt power rating. A small amount (about 12 dB) of loop negative feedback reduces distortion and achieves a sufficiently high damping factor to control reactive loudspeaker systems. To assure continued peak performance, the owner need only make a simple bias adjustment when new tubes are installed. Built in LED bias indicators allow the user to make this adjustment using only the supplied screwdriver.

Separate, low impedance, discrete dc power supply regulators are provided for the input and phase-inverter stages, thoroughly isolating these stages from the power demands of the output stage. These power supplies are designed to maintain a rock solid supply at all audio frequencies.
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MF2550 and MF2275 Solid State Amplifiers
At conrad-johnson we have a simple formula for achieving highly accurate, highly musical amplifiers:
• straight-forward, simple circuits designed for linear operation without excessive loop inverting feedback
• exceptional component parts selected for their ability to provide uncolored accuracy in music reproduction
Straightforward circuits provide simpler, more direct signal paths and require fewer component parts to implement. This is desirable because all component parts fall short of ideal and impose limits to transparency. Fewer parts means less of the unavoidable coloration that is imposed by each part, even the best available. Fewer parts means that the budget can be concentrated to obtain the often costly best available parts especially for key circuit applications.

The design of limited feedback circuit demands discipline from the circuit designer in developing a circuit in which each stage functions linearly without requiring external correction from a feedback loop.

Our latest solid-state amplifiers, the MF2550 and MF2275, nicely embody this approach. Differing primarily in power output rating, these amplifiers share a common circuit design. High voltage FETS permit highly linear operation of the critical first voltage gain stage, while bi-polar transistors are used to configure an output stage with low output impedance to deliver maximum current to reactive speaker loads.

Linear operation of the audio circuit requires a power supply designed to maintain absolutely fixed operating voltages while meeting current demands that fluctuate rapidly with the music itself. This imposes on the power supply similar design and component choice requirements as on the audio circuit itself. These amplifiers feature discrete dc regulators to power the critical voltage gain stage. The power supplies and grounds for the input and output stages are run by separate power transformer windings to isolate the input stage from the effects of the substantial current flows required in the output stage.

Circuit design is a combination of science and art. At every step consideration must be given to how a circuit will be implemented. The realized performance will depend critically on the selected component parts. Conrad-Johnson products are known for unmatched quality of parts with custom-made film capacitors and precision metal film and metal foil resistors. We even use large 30 micro-Farad polypropylene capacitors for critical circuit applications where other designs commonly use non-polar electrolytic capacitors, the factor of 1000 reduction in dielectric absorption of polypropylene resulting in a cleaner sound. The power supply electrolytic capacitors are bypassed with high quality polypropylene film capacitors that provide a small but quicker responding current reservoir. For those wishing to take the musical experience a step further there are available special "SE" versions of these amplifiers which achieve further refinement in imaging, focus, and detail by upgrading a dozen or more critical capacitors to our proprietary CJD Teflon hybrid capacitors and a couple of dozen resistors to precision metal foil types.

Our obsession with parts quality extends to the connections within the circuit itself. Power supply, signal and ground traces and wiring are parts of the circuit with limitations and shortcomings that must be accounted for. To enable the output stage to deliver substantial bursts of current, the layout provides storage capacitors close to each output device. The internal power supply connections and ground returns between the main supply and these local storage depots are accomplished with heavy, audiophile grade multi-stranded wire in order to minimize the impedance of these longer runs.

Thoughtful engineering, specification of high quality component parts, and painstaking care in production make these exceptional audio amplifiers. We invite you to arrange an audition with your conrad-johnson dealer to confirm for yourself their extraordinary musical performance.
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LP260m Amplifier

At conrad-johnson we are keenly aware that component parts contribute importantly to the sonic performance of any circuit design. As expected for conrad-johnson products, the LP125sa and LP260m amplifiers set uncommonly high quality standards. Resistors are precision metal film types. All audio-circuit capacitors, as well as all capacitors in the regulated power supplies are polypropylene and polystyrene. Proprietary wide-bandwidth output transformers contribute to excellent high frequency performance. Even the gold plated connectors and the internal wiring have been carefully selected for optimal sonic performance. These amplifiers offer tube performance that "just sounds right". Those who wish to take the experience a step further will want to investigate the upgraded LP125sa+ and LP260mSE which incorporate CJD Teflon Capacitors and ultra high-performance metal foil resistors in strategic applications in the circuit. Any of these models is sure to rekindle your passion for enjoying great music in your home.

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Classic Sixty SE Amplifier
The new Classic Sixty SE amplifier has once again demonstrated the conrad-johnson design team's commitment to adapting the advances from our state-of-the-art pursuits to more affordable offerings accessible to a wider range of music lovers. Borrowing heavily on the technology of its big brother, the ART amplifier, the Classic Sixty SE preserves the distinctive tonal character of individual instruments and voices, with each clearly located within the overall acoustical environment of the original recording. Musical transients are reproduced with realistic impact, but without artificial enhancement. Like its more costly siblings, the Classic Sixty SE captures the emotional impact of the live event, never getting between the listener and the musical performance.

There really is no mystery to the basis for outstanding musical performance: best results come from simple circuits executed with quality parts. The Classic Sixty SE amplifier circuit design is about as simple as possible, employing just seven vacuum-tubes. Single-ended triode voltage gain and inverter stages are coupled to an output stage comprised of a single pair of ultra-linear operated KT120 tubes for each channel. As it is critically important that the DC voltage supplied to the gain stages be absolutely rock-solid stable, these voltages are provided by simple but highly effective discrete voltage regulators. And speaking of simple, maintenance of the Classic Sixty SE could hardly be easier: the owner need only make a simple bias adjustment using the built in bias indicators when installing fresh output tubes.

The use of premium quality component parts is the other half of our underlying design mandate. In this area as well, the Classic Sixty SE is a leader in its class. Ultra high-performance metal foil resistors in strategic locations and precision, metal-film resistors elsewhere yield low noise performance for greatest clarity. Teflon CJD inter-stage coupling capacitors, along with polypropylene and polystyrene capacitors specified for both the audio circuits and the regulated plate voltage supplies assure a high degree of temporal accuracy. The result is an exceptional range of dynamics – reproducing both subtle variations in level as well as dramatic loud crescendos. Our proprietary trans-spectral wide-bandwidth output transformers contribute importantly to the extended, "airy" highs that help distinguish the Classic Sixty SE from ordinary tubed amplifiers.

The Classic Sixty SE offers low maintenance costs, notable reliability and near state-of-the-art performance at a relatively modest cost. Install one in your audio system and prepare to rekindle your passion for enjoying great music in your home.
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Preamplifiers
GAT Triode Preamplifier
The GAT Preamplifier embodies conrad-johnson’s latest advances in line-stage preamplifier technology. We believe that it will quickly be recognized as the new industry-wide reference standard for line-stage preamplifier performance, a role filled for more than a decade by its legendary predecessor, the ART preamplifier. Like the ART, the GAT Preamplifier will be available in a numbered, limited edition of 250 units which will be sold through selected conrad-johnson dealers.

The GAT Preamplifier is a vacuum-tube, line-stage preamplifier that looks as good as it sounds. It is also notable for convenience and ease of use. The unit features input selection and level adjustment by microprocessor-controlled relays. Level and balance can be adjusted in 100 steps of approximately .7 dB per step. All functions can be controlled by the hand-held wireless remote control.

The circuitry of the GAT Preamplifier is elegant in its simplicity. The audio circuit consists of a single amplifier stage incorporating one composite triode comprised of paralleled sections of a high-transconductance miniature dual triode vacuum tube. This amplifier stage is coupled to the preamplifier outputs through a high-current MOSFET buffer, which achieves a very low output impedance, making the GAT extremely flexible in the choice of interconnect cables and amplifiers. DC voltage is supplied to the circuit by our latest discrete voltage regulator that isolates the audio circuit from the power line by maintaining negligible impedance across the audio frequency band. Infrasonic noise is minimized by operating the tube filaments (heaters) on a dc voltage supplied by another discrete regulated power supply.

Considerable care and attention have been paid to the physical aspects of the design as well. Microprocessor controlled relays, used for selecting sources and level setting, are located right at the input connectors, keeping signal paths short to minimize crosstalk between channels and inputs. The vacuum-tubes are isolated by a suspension system designed to minimize microphonics. The dramatic casework features attractive clear Lucite tube guards outside the chassis, allowing for easy access for tube replacement.

At conrad-johnson we have long appreciated that the full potential of any circuit can only be realized by using the finest available parts. Each part for the GAT has been selected on the basis of both sonic performance and durability. The audio circuit (including the level control) is executed entirely with precision metal foil resistors and proprietary CJD Teflon capacitors. Tubes have been carefully hand selected for minimum noise and microphonics. The dc regulated power supplies use the same quality resistors as the audio circuits. Capacitors for the power supplies are exclusively polypropylene and Teflon – there are no electrolytic capacitors in the audio circuits or their related power supplies. All signal switching is done by special relays designed for signal applications. These relays are sealed and have gold plated silver contacts. Input and output connectors are machined from oxygen free copper, and are gold plated. The GAT is built without compromise to achieve a new standard in musical performance, and it is built to last.
 
 
ET5 Enhanced Triode Preamplifier
Introduced in 2009, the GAT Preamplifier continues conrad-johnson's dominant position atop the rankings of reference preamplifiers. An important benefit of pursuing state-of-the-art designs is that the circuits and techniques developed in our flagship products are frequently directly applicable to out entire line of products. In this instance, we have embodied the technology of the GAT Preamplifier in the more cost effective ET5 enhance triode line-stage preamplifier at a more affordable price.

The circuitry of the ET5 follows closely that of the GAT line-stage preamplifier. 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 ET5 extremely flexible in the choice of interconnect cables and amplifiers. DC voltage is supplied to the circuit by our latest discrete voltage regulator that 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 ET5 is also notable for 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 ET5 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 ET5 into a high quality home theater system without compromising its two-channel performance.

Like its bigger brother, the GAT, the ET5 is constructed from the highest quality, carefully selected parts for unrivaled sonic performance and reliability. Tubes have been carefully hand selected for minimum noise and microphonics. The same CJD Teflon capacitors that distinguish the GAT are used in the ET5 for output coupling and post-regulator power supply storage. All other capacitors in the audio circuits and related power supplies are polypropylene or polystyrene – there are no electrolytic capacitors in the audio related circuits. 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 premium quality custom machined parts.

For more than three decades, we at conrad-johnson have 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 ET5 with your conrad-johnson dealer to experience the extraordinary musical performance of this remarkable preamplifier.
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ET3 Vacuum-Tube Preamplifier
At conrad-johnson, development of our flagship products has traditionally led to important enhancements of our entry-level offerings. The ET3 preamplifier is a case in point. The ET3 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 ET3, along with its DC voltage regulators, closely replicates the circuit of the GAT. Finally, and especially noteworthy, the ET3 features a relay operated discrete stepped attenuator level-control circuit of the type found in the GAT and CT5, absent only the balance control function found in those more costly models.

Functionally, the ET3 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 ET3 offers the convenience of infrared remote control of all functions.

For vinyl enthusiasts, the ET3 is optionally available with a vacuum-tube phono stage that borrows its zero-feedback audio circuit from our reference quality TEA1 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 ET3 phono stage is built to the same high quality standard found in the ET3 line-stage

It would be fair to say that the only thing “entry-level” about the ET3 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.
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Digital

HD3 USB Digital to Analog Converter

The HD3 is an audiophile grade digital to analog converter for use with a computer based audio source. It is designed to exploit the advantages of the recently available high-definition digital source material, to be simple to use, and to establish that digital sources really can "just sound right".

The HD3 is designed to be as hassle-free as possible. Connect it to any available USB port on your computer with a standard USB cable, select the HD3 and you should be ready to play music in a matter of moments. It is designed to work with the drivers built into the operating systems of all modern PC, Mac, and Linux computers, so there is no need to struggle with installing drivers as there are none to install. Just select your favorite tunes from music stored on your computer, or pop a CD into your computer's optical drive, sit back and enjoy.

With its asynchronous data interface virtually eliminating jitter, the HD3 will transform your computer into a high-end CD player competitive with the very best audiophile quality units on the market. But it will do much more than that. By "ripping" your CDs to the computer you can take advantage of software that makes multiple read passes to virtually eliminate data errors, for superior playback. You can store an entire music collection on the hard-drive of your computer, and use your choice of "juke-box" software to search for and select the songs or albums you want to play. Preserve your CDs from possible damage in handling by copying them to your hard drive and putting them away in safe storage. Imagine a couple of thousand or more CDs of music all contained in the space of a small computer. Better yet, the HD3 is designed to deliver better than CD quality material. It will decode up to 24 bit, 96k samples/second music files. These files are available for purchase by download from various on-line sources.

The conrad-johnson analog audio circuits are your assurance that the HD3 will deliver the full potential of these sources and in the end, the music playback will be musical. As expected from conrad-johnson, the circuits are simple and executed with quality parts. A high-end Burr-Brown delta-sigma dac was selected for the digital to analog conversion. This is the most musically satisfying 24/96 capable dac presently available. The analog signal is fed to our own audio circuits, executed with highest quality polypropylene capacitors and metal foil and metal film resistors. The digital circuits are powered by regenerating power from the USB connection itself, while the analog portion of the dac and the analog audio stage are powered by separate transformers feeding discrete dc voltage regulators, thus isolating the analog signal from noise imposed on the grounds and power supply legs of the digital circuits.

 
 
Phono Preamplifiers
TEA1 Phono Preamplifier
The TEA1 triode equalization amplifier is a phono stage available in four different versions to meet a wide range of needs – all designed to satisfy the expectations of the most demanding music lovers. All versions share a common circuit approach featuring a zero loop feedback circuit with passive RIAA equalization. All feature two phono inputs, one with switch selectable resistive and capacitive loading allowing the user to fine-tune performance to the chosen phono cartridge. With the exception of capacitors in the audio circuits and related power supplies, parts quality is identical in all four versions. All resistors are top quality precision metal foil types. I/O connectors are custom made gold-plated machined oxygen-free copper. The TEA1b is the base model TEA1. In the TEA1b, the two phono inputs each provide 54.5 db of gain. Resistive and capacitive loading can be adjusted by toggle switches on the PHONO 2 / Variable Load input. The base model uses CJD Teflon capacitors for all but the highest value capacitors (2.0 micro Farad and higher) in the audio circuit which are polypropylene bypassed by Teflon. A capacitor upgrade is incorporated in the otherwise identical TEA1bc, replacing a number of high value polypropylene capacitors with multiple 2.0 micro Farad CJD Teflon capacitors. The TEA1bt upgrades the base model by adding premium wide-bandwidth audio transformers to the PHONO 1 input to provide the higher gain and very low noise required by low output moving coil cartridges. The active circuit is modified to reduce its gain to 45 db, offering the user one HIGH GAIN transformer coupled input (PHONO 1) with 63 db of gain and one LOW GAIN direct input (PHONO 2) with 45 db of gain. The fully configured TEA1 includes both the transformer option and the capacitor upgrade.

Designed to precisely track the prescribed RIAA equalization curve, the TEA-1 assures absolute tonal accuracy. The low-gain audio circuit of the TEA-1 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. Precision wound input transformers provide the additional 18 dB of gain for the high-gain inputs.

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-1, 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 full potential of any circuit design can only be realized if executed with the highest quality parts. The audio circuits of the TEA-1 use only conrad-johnson's proprietary Teflon capacitors. In the power supplies, all capacitors are polypropylene and Teflon composites - 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 TEA-1's 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-1 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.
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TEA2 Phono Preamplifier
The TEA-2 triode equalization amplifier is a vacuum-tube phono stage offering an extraordinary degree of musical accuracy at a moderate price. The audio circuit of the TEA-2 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. This network has been carefully designed and has been implemented with precision (1% tolerance) parts to precisely track the prescribed RIAA equalization curve assuring absolute tonal accuracy. Careful implementation of this fundamentally simple circuit results in extremely wide bandwidth, and low distortion, without resorting to negative feedback. A high-current MOSFET buffer stage follows the second gain stage to achieve a low output impedance (less than 200 Ohms).

In the TEA-2, discrete regulated power supplies, carefully designed for minimum impedance, even at the highest audio frequencies, isolate the amplifier stages from the ac line and from each other to guarantee that power supply irregularities do not degrade the audio performance.

The TEA-2 is available in high-gain (55 dB) and low gain (40 dB) versions to match a wide range of modern phono cartridges. The high gain version is recommended for use with cartridges with a rated output of 1.0 mV or below. The low gain version is best suited to higher output cartridges. Both versions offer switch selectable resistive loading allowing the user to fine-tune performance to the chosen phono cartridge. The performance of any audio component is only as good as its component parts. The audio circuits and the related regulated power supplies of the TEA-2 use polypropylene and polystyrene capacitors and precision metal film and metal foil resistors exclusively. All parts in the TEA-2's RIAA compensation network are 1% tolerance, to assure precise tracking of the RIAA curve. Input and output connectors and even hook-up wiring have been carefully selected for audio performance. Thoughtful engineering, specification of quality component parts, and painstaking care in production make the TEA-2 a phono equalization preamplifier of remarkable musicality.
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