MARANTZ 2500 MONSTER HIGH FIDELITY RECEIVER

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Marantz 2500 Monster Hi-Fidelity Stereo Receiver · Marantz 2500 Stereo Receiver · Complete with very rare original factory wood trim kit · High Quality Owner's Manual Copy The accomplishments of Saul Marantz in the 50's & 60's have forever changed the world of Hi-Fi. His line of audio components opened a new era of audio fidelity that many feel is still unrivaled today. Despite his design success, his fiscal success did not follow suit; ultimately his quest for perfection was to the detriment of his bottom line . In 1964, in an effort to stave off extinction of his company, Saul Marantz came to an agreement with Super Scope of America, they would be the new owners and the dream team of designers (Saul Marantz, Sid Smith, & Dick Sequerra) would remain intact. . This arrangement was successful in the short time that it lasted, yet the new ownership insistence on appealing to a broader population base and the old owner's unwillingness to put his heart into anything less than perfection caused an inevitable split. In order to ensure the continued existence of the company that bore his namesake, and maintain product integrity that wouldn't disgrace the family name, Saul Marantz assembled a very talented team of design engineers as a parting gift. The post Saul Marantz era of the Marantz corporation was actually more successful then the pre. The company was well suited to compete with the influx of Japanese imports and they had the necessary resources to bank roll costly research and development projects of transistor technology. There were no Rolls Royce type product offerings as the model 9 mono amps, 8b stereo amp, 10b tuner, and 7 preamp , though there were a fleet very respectable Cadillacs that fit well with a larger segment of the American public. Marantz was one of the earliest companies to develop, with a full head of steam, the stereo receiver. This foresight paid off as this all-integrated component was the most popular audio device of all time and accounted for a vast market share of the consumer electronic industry throughout the late 60's and into the 80's. In the 10 year period from 1968 to 1978 Marantz made a total of 57 stereo receivers! This era is known as the 2nd golden age of Marantz, based primarily on what they accomplished with this receiver line. Prodded by the healthy competition of Pioneer, Kenwood, Sansui and others, this component, which was originally intended as a space/money saving alternative evolved into a pretty remarkable piece of audio technology. The pinnacle of Marantz's receiver progression, and one of the all time greatest stereo receivers ever made, was the remarkable, incredibly mammoth 2500. The sole incarnation of the 2500 receiver in 1977 was a ideological homage to Saul Marantz. Perfection at any cost! Its design re-introduced styling and elements that were reminiscent to Saul Marantz's components of years prior and it was a huge leap ahead of anything else in the marketplace. While the receiver wars were simmering for years, the 2500 was the 12th round effort by Marantz, and they held nothing back. In comparison to the 1977 flagship receivers of Sansui and Pioneer, the 9090 & SX-1250 respectively, which were great receivers in their own right, were not even close to the 2500. The following year both companies beefed up their flagship receivers tremendously, the G-33,000 & SX-1980, which in turn spurred Marantz to add more power to the 2500 and giving it the 2600 designation. While the bravado and superiority of all these receivers will always be debated and discussed, it was the 2500 that ignited this level of corporate competition and it was the first one that stirred the emotion of the incredibly awed public. If you remember the Marantz 2500 you probably wanted it. It was on the wish list of many, yet out of the financial reach of most. In 1977-1979 it had a selling price of $1,600.00, which was a lot of money when considering the average Income per year was $15,000.00. Marantz made full acknowledgment of it hefty price in its advertising brochure, " Not everyone can afford the Marantz 2500, but those who can will posses the world's most outstanding stereo receiver..." amazingly this statement is still true 33 years later. Sonically the 2500 is a masterpiece that puts to shame many of the high end separate components of today. It has an obscene amount of power, yet not at the expense of musical fidelity. Unlike the competitors, the 2500 output was not about numbers on a paper, its power is pure and effortless, music from all sources is natural and thoroughly musical. The Tuner section is probably the finest you will ever find on a stereo receiver, again no corners were cut in any design element of the 2500. Other features and functions of the 2500 include; Tremendous & Effortless Power 250 watts per channel at 8 Ohms with no more than 0.05% THD! The first receiver to ever break this barrier! Its Toroidal Power Transformer was especially designed to give you two independent power supply sections, allowing each channel to perform at maximum efficiency and remain unaffected by the power demands of the other channel. The super-efficient tunnel "pin-fin" heat sink design was originally developed for the Marantz 510M Professional amplifier. All this power is generated by one of the most innovative amplifier sections ever created; a full complementary symmetry direct-coupled output. Even more, it utilizes a quadruple-paralleled transistor array-a design previously never before used in a receiver. The results is the highest possible day-in, day-out operating reliability and the lowest total harmonic distortion. Built-In Oscilloscope ? A design element originated by Saul Marantz and his design dream-team in the Marantz 10 tuner and carried over to their first collaborative effort, the Marantz 18 receiver. Marantz was the only company to integrate a true CRT oscilloscope in to a receiver. The benefits are much more that an awesome visual display. An in-depth display for accurate FM/AM tuning adjustment, multipath adjustment & stereo separation. 5-Gang FM Tuning Capacitor & Dual-Gate MOS FET Front End ?One of the most advanced FM tuner sections ever integrated into a receiver. It exhibits superior linearity and rejection of spurious signals with an IHF useable sensitivity of 1.5 microvolts and a 50 dB "quieting sensitivity" figure in stereo of 25 microvolts-the finest such specification ever obtained in a receiver-or even a separate tuner. the quieting slope measures signal-to-noise performance under actual operating conditions. The graph below shows complete stereo and mono quieting specifications for the model 2500 ? • High Grade Phono Preamplifier ?The phono preamp is a 4-stage, 40 dB gain amplifier utilizing 100% DC feedback-equalized circuitry. In the circuit design of this preamp, low noise and wide dynamic range were of paramount importance. In order to achieve this end, we used a differential input transistor pair, a constant current source stage, and a high gain stage. It is powered by a regulated, symmetrical, bipolar power supply. Low noise carbon film type resistors are used throughout. The equalizing capacitors are film types selected for their stable thermal and low microphonic characteristics in this critical application. Close tolerance parts ensure a precise adherence to the RIAA equalization characteristic. Finally, special aluminum capacitors are used for the input and output coupling to the high level circuitry, for their low leakage and long life characteristics • 18 dB Per Octave Bessel-Derived High Filter ?A superior linear phase filter design-the most advanced in audio. It reduces high frequency noise-and does the job with a more natural, less colored sound because it eliminates the overshoot and "ringing" common to other filters • 18 dB Per octave 15Hz Sub-Sonic Butterworth Low Filter ?Cuts sub-sonic transients and rumble that robs you of the amplifier power vital for accurate reproduction of low frequency signals. The Butterworth low filter assures that all your power is used to reproduce only actual program material. Not wasted on unwanted noise or rumble. • 2 LED Peak Power Indicators ?Continuously monitor the amplifier section and instantly let you know when transients are driving the amplifier to full output • Six Tone Controls-3 For Each Channel ?The tone circuit consists of an IC pre-tone amplifier with 9 times gain. The tone amplifier is a unity gain dual feedback pair design. Marantz employed the Baxandall type of tone control, because it tends to concentrate the boost or cut in the lowest bass range without undue affect on the lower midrange frequencies. This offers more natural compensation for the variety of loudspeakers and peripheral equipment that may be used with this model. • Selectable Frequency Turnover Points ?The turnover switch adjusts the turnover frequency of the bass (100 Hz to 250 Hz) and treble (5 kHz or 10 kHz) controls and this increases the flexibility of the tone circuit. • Loudness Compensation ?The loudness compensation provides a Fletcher-Munson type frequency response correction curve, offering both bass and treble boost to compensate for the human ear's characteristic at low volume levels. This boost remains constant to an 11:00 o'clock position on the volume control, while from 11:00 to 1 :00 o'clock the curve is gradually reduced to a flat response • Independent Tape Copy Facility • Phase-Locked Loop • Linear Phase IF Filters • LED Function Indicators • Gyro-Touch Tuning And Much More! Amplifier Section Rated Power Output minimum continuous average power per channel, both channels driven 250W per channel Power Band 20 Hz to 20 kHz Total Harmonic Distortion 0.05% Load Impedance 8 Ohms Rated power Output minimum continuous average power per channel, both channels driven 330 W per channel Power Band 20 Hz to 20 kHz Total harmonic Distortion 0.08% Load Impedance 4 Ohms I.M. Distortion (I.H.F. method, 60 Hz and 7 kHz mixed 4: 1 at rated power output) at 8 ohm load impedance : 0.05% at 4 ohm load impedance: 0.08% Damping Factor (at 20 Hz) 60 Sensitivity (at MAIN IN) 1.5 V Impedance (at MAIN IN) 40kohms Frequency Response for Power Amp Only (at 1 Watt output, 20 Hz to 20 kHz) Preamplifier Section Phono Input Overload at 1 kHz: 200 mV Equivalent Input Noise: 1.0pV b> Dynamic Range : 106 dB (Dynamic Range is the ratio of input overload to equivalent input noise) Input Sensitivity: 1.8 mV Input Impedance: 47kohms Input capacitance : 100pF Frequency Response, R IAA 20 Hz to 20 kHz: +/- 0.2 dB Signal-to-Noise Ratio : 80 dB(at rated output and 7.75 mV input) High Level (Aux and Tape) Input Sensitivity : 180 mV Input Impedance: 40kohms Frequency Response : 10 Hz to 60 kHz, +/- 1.0 dB (includes power amp) Signal to Noise Ratio: 98 dB (ref. to rated output and 775 mV input) Output Levels Tape Out: 775 mV (ref. 7.75 mV at Phone inputs) Pre-Out: 1.5 V (ref. 180 mV at Aux inputs) 4.2 V (ref. 500 mV at Aux inputs, main amp disconnected) Output Impedance Tape Out: 500ohms Pre Out: 450ohms FM Tuner Section Sensitivity IHF Usable: 8.75dBf (1.5uV) IHF 50 dB Quieting: (Mono) 12.1 dBf (2.2 uV) (Stereo) 33.2 dBf (25 uV) Quieting Slope (Mono) RF Input for 30 dB Quieting: 6.8 dBf (1.2 pV) Quieting at: 20dBf( 5.5uV): 60dB 25dBf( 10uV) : 66dB 40dBf( 55uV): 78dB 65dBf(1000uV): 82dB Quieting Slope (Stereo) Quieting at: 30dBf( 17uV) ; 49dB 40dBf( 55pV): 62dB 50dBf( 173pV) : 70dB ,br>65dBf(1000,uV): 75dB Distortion (Mono) at 65 dBf (1000 uV) 100Hz: 0.15% 1000Hz : 0.1% 6000Hz : 0.15% Distortion (Stereo) at 65 dBf (1000 pV) 100Hz; 0.35% 1000Hz : 0.2% 6000Hz : 0.3% Distortion (Mono and Stereo) at 50 dB Quieting, 1000 Hz: 0.4% Hum and Noise at 65 dBf (1000 uV) Mono: 80dB Frequency Response 30 Hz to 15 kHz Mono: +0.2 dB, -1.0 dB Stereo: +0.2 dB, -1.0 dB Capture Ratio at 65 dBf (1000 ,uV) 1.0 dB Alternate Channel Selectivity 85 dB Spurious Response Rejection 120 dB Image Response Rejection 120 dB I. F. Rejection (Balanced) 120 dB A.M. Suppression 60 dB Stereo Separation 100Hz: 45dB 1000Hz: 50dB 10kHz : 42dB Subcarrier Rejection 75 dB AM Tuner Section IHF Usable Sensitivity 10 uV Distortion (THD), 30% Modulation 0.4% Signal-to-Noise Ratio 55 dB Alternate Channel Selectivity 50 dB Image Rejection 80dB Spurious Response Rejection 80 dB I.F. Rejection 80dB General Power Requirements 120 V (60 Hz) Power Consumption at rated output, both channels operating 920 W Idling Power (Volume Control at zero) 115 W Dimensions: 19 1/4" W x 7" H x 17 1/4" D Box: 23” x 23” x 11” Receiver will be triple boxed for shipping Weight 60 lbs +10 lbs for original boxes & packaging Receiver is in excellent condition sonically, functionally, and cosmetically. One owner, used occasionally. It is operating well within the original published specifications. Receiver was fully tested and is performing flawlessly. All lights, scope, phono section FM, Am, everything is working. Receiver cosmetics in excellent condition, Just went through a complete service by an authorized Marantz repair facility in Southern California. Currently under 60 day warranty. PayPal Preferred....Never a handling fee, buyer pays actual shipping as stated above.