McIntosh MC2505 power amplifier

Solid State Power Amplifier

New performance standards have been set by the new innovations in Solid State development by McIntosh. Hear new beauty and subtle delicate passages of music that until now have been clouded by lower performance standards.

 

First Solid State Power Amplifier with Full Power of 50 watts per channel at all speaker impedances of 4, 8 and 16 ohms

The new McIntosh model MC 2505 matches any speaker impedance of 4, 8  or 16 Ω  with full rated power. The newly designed McIntosh unity coupled auto former provides proper matching for all speakers or crossover networks. The auto former provides optimum speaker damping for precise control of overshoot and maximum clean bass response. Damping factor is greater than 25 at 4 Ω , greater than 40 at 8 Ω ,, greater than 11 at 16 Ω .

 

First Solid State Power Amplifier using Precision Calibrated Output Level Meters

The Calibrated Power Level Meters provide continuous indication of how much power is being delivered to the speakers. The meter can be used for measuring other elements of your stereo system. These are not ordinary meters. McIntosh has again LED with a new concept in a meter circuit design.

Normal meter operation is frequency discriminating. Not so the McIntosh Power Monitor Meters. Careful engineering has produced peak locking meters with a Time Stretching Circuit, that permits the meter to follow peak program material with an accuracy better than 2%. You can now know the complete performance of your music system.

 

First Solid State Power Amplifier with McIntosh "Panlock" front panel mounting

The McIntosh MC2505 mounts conveniently in a panel with "Panlock" mounting shelves.

 

First Solid State Basic Power Amplifier with McIntosh "Performance Reliability" Sensor Circuits

New McIntosh "performance Reliability" sensing circuits assure constant year-to-year performance of your solid-state amplifier under all types of use conditions. Instantaneous electronic sensing of amplifier output and load conditions rigidly maintains top amplifier performance. Ther are no fuses in speaker line to worry with and no special backup caution needed. A thermal-sensing unit on each oversized heat sink gives additional reliability control.

 

Specifications

Power Output:  50 watts RMS continuous power per channel, both channels operating into 4 Ω , 8 Ω  or 16 Ω  loads

Total Harmonic Distortion:  less than 0,25% at rated power output from 20 Hz to 20 kHz. Both channels operating. Distortion typically measures less than 0,1%. Distortion decreases as output power is reduced.

Intermodulation Distortion:  less than 0,25% for any combination of frequencies between 20 Hz and 20 kHz at 210 peak watts output per channel or at any level less than 100 peak watts per channel. Both channels operating

Frequency Range: 

at rated output both channels operating :  20 Hz through 20 kHz +0 -2,5 dB

At reduced power :  10 Hz through 100 kHz +0 -3 dB

Output Impedance:  4 , 8 and 16 Ω .full rated power output is provided at each output tap. The 16 Ω  output will provide 25 volts RMS for constant voltage multiple speaker distribution lines.

Output Damping Factor:  greater than 25 (at 4 Ω ), 40 (at 8 Ω ), 11 (at 16 Ω )

Input Sensitivity and Impedance:  0,5 volts will produce rated power output; a gain control is provided for each channel allowing independent adjustment of amplification in each channel. Input impedance is 200,000 Ω

Hum and Noise:  greater than 90 dB below rated output

Output Power Monitor Meter:  Meter is calibrated to read +3 dB when amplifier produces rated output. Meter range switch is provided to increase meter sensitivity by 10 dB or 20 dB.

Headphone Output:  Designed for low impedance headphones

Controls:  Power on-off switch, speaker on-off switch, left gain, right gain, meter range switch.

Special Features:  The amplifier is completely stable when connected to any loudspeaker system or reactive loads. The MC 2505 has special circuitry to prevent damage by inadvertent or intentional short circuit or open circuit of the output loads, or by any amount of the output impedance mismatch. Thermal cutouts are mounted on the output transistor heat sinks to provide protection in the event of inadequate ventilation.

Semiconductors:  28  silicon transistor; 32 silicon rectifiers and diodes

Power Requirements:  117 Volt AC 50/60 Hz

Power Consumption:  75 watts at "Zero" signal output; 250 watts at rated output

Dimensions

Front Panel (W x H):  16" x 5-7/16"

Chassis (W x H x D) :  15" x 4-1/2" x 13" (including connectors. Clearance in front of mounting panel including knobs, 1-1/2"

Weight:  38 pounds (net), 53 pounds(shipping)

Finish:  Front panel Anodized gold and black

Chassis:  Chrome and black

Mounting :  Convenient, professional Panlock

Electro-Voice T35B Driver

 

 Super Sonax Very-High-Frequency Driver

The human ear delights in the variety of sounds resulting from the widest range reproduction. This wide range response delivers also the subjective illusion of reality. Extended high-frequency response in the last audible octaves is made necessary still more in the accomplishment of musical balance with the augmented bass range of present speaker systems of the folded corner horn and phase loaded type. Here fundamentals of the first audible octave require flat response in the high range to the limit of audibility, or aesthetic appreciation of the source material suffers from unconscious listener fatigue caused by the imbalance.

These needs have resulted in intensive research by Electro-Voice physicists and engineers to the end that new principles and new techniques have evolved a superior series of VHF drivers which have overcome range and sensitivity limitations.

 

The improved T35B, and T35 Super-Sonax, very-high frequency drivers are designed to complement all Electro-Voice speaker systems, and systems of alternative manufacture, when smooth, efficient, extended response is desired past 3500 cps. These drivers have specialized integral horns of the diffraction type which afford wide dispersion. This dispersion characteristic is especially valuable in stereo or binaural reproduction, where even distribution of sound energy throughout the listening area is a requisite to preserve the proper aural horopter.

 

The Hoodwin Diffraction Horn

All Electro-Voice drivers employ diffraction horns as the recommended method of achieving the best dispersion. In stereo work especially, a 3 dB concentration of sound in one portion  of the room is sufficient to cause apparent displacement of the subject, with resultant distortion of the "solid" or stereo effect.. This changes the aural perspective so necessary to the preservation of the illusion of reality, and smooth dispersion insures duplication of the original sound source depth and width. The spatial relationship of the original sound source to the axis of the two ears is termed the aural horopter, and an even sound distribution, coupled with balancing the levels of both right and left speakers is insured through the diffraction principle.

 

Voice Coil Assembly

By using a diaphragm assembly of practically indestructible phenolic-impregnated linen, radial splitting, buzzing and modular breakup are eliminated. Because reproduction of the extreme high frequencies is mass-controlled, the self-supporting voice coil has no heavy coil form and is therefore practically weightless, providing extended high-frequency response.

 

Specifications

Frequency Response:  3,500 - 19,000 Hz ±2 dB

Recommended Crossover:  3500  Hz

RETMA Sensitivity Rating:  57 dB

Polar Pattern:  180 ° dispersion

Power Handling Capacity

Program :  50 watts

Peak :  100 watts

Nominal Impedance:  16 Ω

Voice Coil Diameter:  1 inch

Magnet Weight: 7 oz

Gauss:  13,500

Size

Horn :  5-1/4" long x 2" wide

Pot Diameter :  2-1/4" max.

Depth :  3-1/4" overall

Baffle Opening:  1-3/4" x 4-1/4"

Weight (Shipping):  3,5 lbs

 

Electro-Voice T35B driver

Super Sonax Very-High-Frequency Driver

Thrilling Upper Octaves are silky-smooth and completely reproduced with E-V's new Super-Sonax VHF Tweeters. Add one to your single speaker for an extended-range 2-way system, to your coaxial for a 3-way system, or to your separate multiple  2-way for a super 3-way system. Either tweeter is easily installed in a few minutes. Takes over from 3,500 cps to beyond the limits of audibility. Famous E-V patented diffraction horn insures 180 degree dispersion. Readily mounts into your present enclosure or E-V folded-horn corner enclosure.

The T35B is designed for use with any system having a rated capacity of up to 20 watts.

 

Specifications T35B

Frequency Response:  3,500 - 18,000 Hz ±2 dB

Recommended Crossover:  3500  Hz

RETMA Sensitivity Rating:  54 dB

Polar Pattern:  180 ° dispersion

Power Handling Capacity

Program :  50 watts

Peak :  100 watts

Nominal Impedance:  16 Ω

Voice Coil Diameter:  1 inch

Magnet Weight: 4 oz

Gauss:  9000

Size

Horn :  5-1/4" long x 2" wide

Pot Diameter :  2-1/4" max.

Depth :  3-1/4" overall

Baffle Opening:  1-3/4" x 4-1/4"

Weight (Net/Shipping):  2 / 3 lbs

Electro-Voice T350 VHF Driver

T350 Deluxe VHF Compression Driver

Designed to complement Electro-Voice deluxe high fidelity drivers, the T350 VHF driver combines smooth, extended high-frequency response with efficient performance. An integral diffraction horn couples the diaphragm to the air and assures the widest possible sound dispersion. This uniform distribution of sound energy is especially important in stereo reproduction to allow the largest possible listening area.

 

Exclusive Sonophase throat design is incorporated in the T350 VHF driver. Response is flat up to 4 or 5 kHz, after which destructive interference results from inability of the diaphragm to act as a piston. Increasingly higher frequencies cause the phase of sound produced at the diapragm periphery to shift with respect to sound produced by the diaphragm center-due to diaphragm deformation . In the Sonophase design, sound from the central portion of the diaphragm is delayed by the longer path length, restoring proper phase relationship and level as the frequency increases. The importance of the Sonophase throat design is paramount above 12 kHz, where sound must be taken from the center of the diaphragm and the periphery simultaneously; in this design this is accomplished without destructive interference or cancelation within the sound chamber. At lower frequencies where the diaphragm acts as a piston, and no phase shift is required in the path configuration, the longer central path length does not appreciably change the phase due to the longer wave lengths involved.

 

The single-wound self-supporting voice coil is epoxy-bonded to a phenolic impregnated diapragm. This extremely rugged assembly will withstand high power levels, and yet is light enough to follow precisely the complex VHF wave forms.

 

Specifications

Frequency Response:  3,500 to 23,000 Hz

Nominal Impedance:  8 Ω

Power Handling Capacity

RMS :  5 watts

Program :  50 watts

Peak :  100 watts

Voice Coil Diameter: 1"

Magnet:  1 pound Alnico V

Recommended Crossover Frequency:  3,500 Hz

EIA Sensitivity Rating:  60 dB

Dimensions

Horn (H x W):  7-1/4" x 2-7/8"

Pot Diameter :  3-1/2"

Overall Depth :  4-3/8"

Baffle Opening :  2-3/8" x 4-7/8"

Net Weight:  7 pounds

Electro-Voice 15TRX loudspeaker

Incorporating all the design advantages of the famous Electro-Voice Radax Coaxial principle, the 15TRX and 15TRXB integrated 3-ay loudspeakers include, also, the latest developments in the art. Of reproducing the highhest audible frequencies through the use of integral Super Sonax VHF drivers. Bass response is excellent, affording pleasing musical balance without the masking effects often experienced from extended high-frequency reproduction.

Both the 15TRX and 15TRXB loudspeakers are tailored to optimum listening requirements; latest developments incorporated insure uniform, smooth coverage of the entire listening area. The engineered features of these E-V integrated 3-way speakers include true concentric mounting of all reproducing elements; augmented balanced bass response in conjunction; carefully tailored mid-range characteristic to provide realism and a considerable degree of "presence" at usual sound levels.

Further benefits are afforded in the high-frequency section of the Electro-Voice integrated 3-way speakers by the incorporation of E-V developed diffraction horns to achieve the best dispersion. An adjustable "brilliance" control is incorporated to allow matching of response to room acoustic, compensating for high-frequency absorptive effects of heavy draperies and soft furnishings. A true 2-way electrical crossover network minimizes distortion, and a massive ceramic magnet assembly provides highest efficiency, excellent damping and extended range.

 

Specifications

15TRX loudspeaker

Frequency Response:  25 - 20,000 Hz

Nominal Resonance:  25 Hz

Corssovers:   2,000 Hz (mechanical); and 3,500 Hz (electrical)

EIA Sensitivity Rating:  55 dB

Power Capacity

Program Material :  40 watts

Peak :  80 watts

Nominal Impedance:  8 Ω

Magnets

Woofer :  4 lb 10 oz Ceramic

Tweeter :  6,8 oz Alnico V.

Size: 15-1/8" diameter; 13-1/2" baffle opening; 8-1/4" depth behind panel

Net weight:  27 pounds

Price:  $166,00

 

Electro-Voice 15TRXB loudspeaker

Both the 15TRXB and 15TRX incorporate the exclusive Sonophase throat design in the high-frequency section. The importance of the Sonophase throat is paramount above 12 kHz where sound must be taken from the center of the diaphragm and periphery simultaneously. In this design this is accomplished without destructive interference or cancellation within the sound chamber.

 

Specifications

15TRXB loudspeaker

Frequency Response:  30 - 20,000 Hz

Nominal Resonance:  30 Hz

Corssovers:   2,000 Hz (mechanical); and 3,500 Hz (electrical)

EIA Sensitivity Rating:  52 dB

Power Capacity

Program Material :  30 watts

Peak :  60 watts

Nominal Impedance:  8 Ω

Magnets

Woofer :  1 lb 6 oz Ceramic

Tweeter :  3,16 oz Alnico V.

Size: 15-1/8" diameter; 13-1/2" baffle opening; 9" depth behind panel

Net weight:  14 pounds

Price:  $94,50

Electro-Voice 15TRX Mark II loudspeaker

Electro-Voice 15" three-way speakers

 

15 TRX Mark II

Similar to the fine 15 TRX except slightly less efficiency and bass response.

Excellent value for superior sound.

Response:  30 - 20,000 Hz

Nominal Resonance:  33 hz

Crossovers:  2,000 Hz (mechanical); 3,500 Hz (elecrtical)

With tweeter level Control:  60 watts peak and 8 ohms impedance

EIA Sensitivity Rating:  50 dB

magnets:

Woofer:  1 lb 6 oz ceramic

Tweeter:  3,15 oz ceramic

Size: 15-1/8" diameter; 13-1/2" baffle opening; 8-1/4" depth behind panel

Net weight:  19 lbs

Price:  $144,00

Bozak Celestovox B-1207 speakers

Bozak Celestovox Speaker System , model B-1207

One of great deterrents to reproducing music in the home so that it has the fullness of dimension which characterizes concert hall listening lies in the size of the typical home listening room.

In the vast space of the concert hall, sound revererates from wall and ceiling surfaces there is a finite interval between the time that the direct sound impinges on the ear and the time that the reflected waves reach the listener. In the home situation, reflected sound reaches the ear almost simultaneously with the direct sound, hence there is no feeling of spaciousness.

Bozak engineers have devised a system which so nearly, simulates concert hall conditions in the living room that a whole new dimension is added to home listening. It consists of the Bozak Model 900 Celeste Time Delay and the Model B-1207 Celestovox loudspeaker system especially designed to provide ambience by reflecting sound from flat wall and ceiling surfaces.

 

Driven by a separate 25-watt or greater stereo amplifier, a pair of Celestovox's can add the excitement of concert hall ambience to your own listening room. Strangely enough, the sound is so natural that you may be unaware of the enhancement unless you switch off the Celestovox speakers, then your ears will quickly detect the lack of ambience.

 

Since the Celestovox speaker system operates by reflecting off flat wall surfaces there is complete flexibility with regard to speaker location within a room. There is no need for corner placement, since front projection is not required, the Celestovox can be placed behind furniture. Exact location in a particular room can best be established by trial.

In the concert hall, high frequencies are naturally attenuated more rapidy than lows. Celestovox incorporates a high frequency roll-off control to permit adjustment to room acoustics and personal taste.

 

Specifications

Power Rating:  70 watts program

Impedance:  8 Ω

Crossover:  2,500 Hz at 6 dB per octave

Drivers:  Bozak B-207B coaxial two-way drivers

Roll-Off Control:  Three-position, 6 dB per octave

Dimensions (W x H x D):  15" x 30" x 15"

Cabinet Finish:  True walnut veneer

Weight:  60 pounds (shipping)

Denon DP-5 turntable

DP-5 Denon Linear Tracking Quartz Turntable

Microprocessor control and high-precision linear tracking are combined with Denon quartz rotational stability and fully array of functions to make the DP-5 anew standard in compact linear-tracking turntables.

Microprocessor memory for versatile playback; the "Random Access Selector" allows somgs to be played back in any order you choose.

Automatic record size sensor

Synchronous operation with a cassette deck

Locate and quick repeat functions

Compact display shows operation status at a glance

 

Specifications

Drive System:  Linear drive motor, direct drive

Wow and Flutter:  0,02% WRMS (Servo  System)

Signal-to-Noise Ratio:  75 dB (DIN-B)

Dimensions (W x H x D):  335 x 80 x 350 mm

Weight:  5 kg

Denon DP-3 turntable

DP-3 Denon Quartz, Linear Tracking Turntable

Hiegh-precision linear tracking tonearm. Clear and bright music reproduction because there's no tracking error distortion.

Dynamic damping cuts tonearm resonance and acoustic feedback

Automatic record size sensor

Special muting circuit. Cuts noise when the stylus enters or leaves the record during tonearm operations

Locate and quick repeat functions

Linear drive motor with Denon quartz control

 

Specifications

Drive System:  Linear drive motor, direct drive

Wow and Flutter:  0,02% WRMS (Servo  System)

Signal-to-Noise Ratio:  75 dB (DIN-B)

Dimensions (W x H x D):  335 x 80 x 350 mm

Weight:  5 kg

Sony STR-333L receiver

 

Stereo Receiver

25 watts per channel (20 Hz - 20 kHz)

Four wavebands: VHF, MW, LW and SW

One touch programme sensor, a new system which has all the convenience of pre-sets with advantage of a visual display of the station location. Five stations can be programmed on VHF and five on LW, and then recalled by direct access push buttons

Five segment LED signal strength indicator which tells you precisely how strong a signal you are receiving

Loudness control

Headphone socket

 

Specifications

Amplifier Section

Rated Output (RMS):  25 W/ch (20 - 20,000 Hz, 8 Ω )

Total Harmonic Distortion:  0,3% at rate output

Inputs /Sensitivity/Impedance

Phono :  2,5 mV/50 k Ω 

High Level Inputs :  150 mV/50 k Ω 

Outputs Level/Impedance

Rec Out :  150 mV/ 10 k Ω 

Speakers :  8 Ω 

Headphones : 8 Ω 

Frequency Response:  Phono RIAA equalisation curve ±1 dB, 10 - 50,000 Hz +0/-1 dB

Signal-to-Noise Ratio: 

Phono :  70dB

Others :  90 dB

FM Section

Tuning Range:  87,5 - 108 MHz

Sensitivity:  1,9 µV (IHF)

Capture Ratio:  1 dB

Selectivity:  55 dB

Frequency Response:30 - 15,000 Hz +0,5/-2 dB

Stereo Separation:  45 dB (1 kHz)

Aerial Terminals:  300 Ω  (balanced); 75 Ω  (unbalanced)

AM Section

Tuning Range: 

MW :  530 - 1605 kHz

LW :  150 - 350 kHz

SW :  5,8 - 15,8 MHz

Aerial:  built-in ferrite bar (LW), attached antenna wire (MW), external aerial terminals (MW, LW)

General

Power Requirements:  AC 240 V, 50 Hz

Power Consumption:  240 watts

Dimensions (W x H x D):  430 x 145 x 310 mm

Weight:  7,6 kg

Sony STR-V3L receiver

 

Stereo Receiver

25 watts per channel (20 Hz - 20 kHz)

Pre-set facility for 5 VHF stations

Twin centre tuning and signal strength meteres

3 wavebands: VHF, MW and LW

Combination stereo/mono and FM muting switch

 

Specifications

Amplifier Section

Rated Output (RMS):  25 W/ch (20 - 20,000 Hz, 8 Ω )

Total Harmonic Distortion:  0,3% at rate output

Inputs /Sensitivity/Impedance

Phono :  2,5 mV/50 k Ω 

High Level Inputs :  150 mV/50 k Ω 

Outputs Level/Impedance

Rec Out :  150 mV/ 10 k Ω 

Speakers :  8 Ω 

Headphones : 8 Ω 

Frequency Response:  Phono RIAA equalisation curve ±0,8 dB, 10 - 40,000 Hz +0,5/-3 dB

Signal-to-Noise Ratio: 

Phono :  75 dB

Others :  100 dB

FM Section

Tuning Range:  87,5 - 108 MHz

Sensitivity:1,6 µV (S/N=26 dB)

Capture Ratio:1 dB

Selectivity:70 dB

Frequency Response:30 - 15,000 Hz +1/-2 dB

Stereo Separation:  45 dB (1 kHz)

Aerial Terminals:  300 Ω  (balanced); 75 Ω  (unbalanced)

AM Section

Tuning Range: 

MW :  530 - 1605 kHz

LW :  150 - 350 kHz

Aerial:  built-in ferrite bar, external aerial terminals (MW, LW)

General

Power Requirements:  AC 240 V, 50 Hz

Power Consumption:  230 watts

Dimensions (W x H x D):  440 x 145 x 370 mm

Weight:  8,5 kg

Marantz PM-7000 amplifier

PM7000 Integrated Stereo Amplifier

The Marantz PM7000 Stereo Integrated Amplifier offers music enthusiasts uncompromising audiophile sound quality and superior flexibility of operation. It delivers 2 x 95 watts (into 8 ohms), rising to 155 watts with 4 ohm speakers. A single push-pull amplifier, symmetrical circuitry with independent heat sink, anti-resonant, metal front panel and hand selected customized components including HDAM, assure an accurate tonal and image balance. With full system remote control operation, the PM7000 is the ideal center piece for a true high-end music system

 

Features

95 Watts Per Channel Power Output (into 8 ohms)

HDAM (High Definition Amplifier Module)

Symmetrical Push-pull Amplifier

Premium-quality Parts and Construction

Seven Source Inputs Including Moving Magnet (MM) Phono Input

Remote Control Operation Including Volume Adjustment

D-BUS Connector for Integration With a Complete Marantz System

Record Output Selector Function Allows Listening to One Source While Recording Another

Source Direct Switch Bypasses Tone Control Circuitry for Maximum Signal Purity

Processor Loop Allows Connection of a Graphic Equalizer or Other Audio Processor

Two Sets of Switchable Speaker Outputs

Headphone Jack is Included for Private Listening

Three AC Convenience Outlets

 

Specifications

Continuous Power Output (RMS) 8 Ω  (<.03% THD, 20Hz - 20kHz):  95 + 95 W

Dynamic Power (4 Ω ) :  120 + 120 W

Total Harmonic Distortion (8 Ω ):  0,3%

Damping Factor:  150

Input Sensitivity/Impedance

Magnetic Phono Input :  2,5 mV/47 k Ω 

Tuner/CD/Aux/Tape Inputs :  150 mV/40 k Ω 

Signal to Noise Ratio

Magnetic Phono Input :  85 dB

Tuner/CD/Aux/Tape Inputs :  88 dB

Tuner/CD/Aux/Tape Inputs

Frequency Response :  10Hz - 50kHz  (-1 dB limits, Source direct)

Tone Characteristic (100Hz & 10kHz) :  ±8 db

Channel Separation :   >80/>70 dB (1kHz/10kHz, Source Direct)

Magnetic Phono Input Accuracy of Frequency Response to RIAA Curve :  0,5 dB

General

Color:  Black

Front Panel:  Metal

Remote Control RC7000PM

Power Requirements:  120 V, 60 Hz

Power Consumption:  250 W

Dimensions Inches (W x H x D):  17-3/8" x 6-1/4" x 14-5/18"

Weight:   27,2 lbs