Heathkit AA-1800 power amplifier

New Higher-Power pro-Series Amplifier - the most powerful Heathkit amp ever.

Heath Company helped pioneer the field of high-power amplifeiers. Now, advances in high-power output devices, new design technology and extensive listening tests make the Heathkit AA-1800  Pro-Series Audio Amplifier one of the best high-power amps available. The wider dynamic range achieved by new recording techniques require power and headroom to reproduce the full sound spectrum, without clipping peaks. People who listen to the AA-1800 find accurate, clearly defined music - at a wallet-pleasing price.

From the power cords to the speaker outputs, more value is built into the AA-1800. a wire-frame chassis, similar to those used in computers, makes the AA-1800 a more durable unit in a smaller package, with excellent ventilation. This new chassis simplifies the easy 24-hour kitbuilding experience, too. Two line cords with remote AC switching relieve your preamp from the need to switch high currents. Convection cooling means no fans and quieter operation. Individually fused power supply lines, along with rugged output devices, eliminate electronic dissipation limiters - which can cause tweeter-damaging clicks and pops. LEDs for each channel indicate full easy access.

Complete speaker  protection includes a speaker turn-on delay - which keeps power-up and power-down transients away from the speakers. In fact, the AA-1800's speaker protection system is so efective, we've applied for a patent.

Thermal circuit breakers protect the system from excessive heat.

Designed in the striking pro-Series style, the AA-1800 can be mounted in any EIA Standard 19-inch rack, such as the AE-1705 Pro-Series Rack. Large side handles are provided for easy rack mount installation.

Specifications

Frequency Response:  20 Hz - 20 kHz ±0,1 dB;  3 Hz - 100 kHz ±1 dB (at 1 watt)

Total Harmonic Distortion Plus Noise:  0,025% (from 250 mW to 250 Watts)

TIM (DIM 100):  less than 0,03% (3,18 kHz square wave and 15 kHz sine wave mixed 4 to 1, f[c]=100 kHz, measured at rated output.

Hum and Noise (unweighted):  -85 dB (1 watt ref.)

Full Power Trip  Frequencies of Speaker Protection Circuit:  less than 16 Hz, more than 30 kHz.

Low Frequency Damping Factor:  greater than 100

Input Sensitivity:  110 mV ( for 1 W at 8 Ω)

Input Impedance:  20 k Ω, shunted by less 50 pF

Channel Separation:  60 dB min. 20 Hz to 20 kHz

Power Requirements:  120 V AC, 60 Hz

Power Consumption:  1200 Watts

Dimensions (W x H x D):   472,6 x 177,5 x 415,5 mm (19" x 7" x 16,75")

Weight:  22,68 kg ( 50 lbs)

Heathkit AA-1600 power amplifier

High-Performance Rack-Mount Stereo Power Amplifier

The AA-1600 is the first amplifier in our new series of professional-style rack-mount stereo components. Other products in the series include the AD-1701 Graphic Indicator, the AJ-1600 AM/FM Digital Tuner, and the AP-a800 Deluxe Stereo Preamplifier. In performance, specifications and sound reproduction, these products are designed to rank with the finest stereo components available anywhere.

The AA-1600 reproduces the entire musical spectrum with a clarity and definition that make it an excellent choice for use with the most demanding speaker systems. Hhum and noise are a full 100 dB down, so music springs forth from a background of total silence. Transient Intermodulation Distortion, a recently discovered form of amplifier distortion which tends to "muddy" the sound, is so low (less than 0,05%) we're one of the few manufacturers to specify it. This low T.I.M. contributes to clean, well-defined sound especially at the high end of the frequency spectrum. Fused B+ and B- power supply lines for each channel, along with especially rugged output devices, eliminate the need for dissipation limiters which can cause tweeter-damaging clicks and pops from faalse triggering.

Of course, there's complete speaker and circuit protection, including speaker turn-on delay and a thermal circuit breaker.

To assure performance to our superior specifications, the amplifier and power supply circuit boards are supplied fully assembled, tested and adjusted. Minimal point-to-point wiring and a clean, opem chassis layout contribute to easy building. The AA-1600 is designed for mounting in a standard EIA equipment rack, or for installation in the AEA-1800-1 accessory cabinet. The AA-1600 is one of the finest amplifiers Heath has ever designed, and an easy and enjoyable kitbuilding experience too. Make it a part of your music system now.

Specifications

Frequency Response:  7 Hz to 50 kHz ±1 dB

Intermodulation Distortion (SMPTE):  less than 0,05% (from 250 mW to 125 watts)

Transient Intermodulation Distortion (T.I.M.) after, Leinonen, Otala and Curl:  0,05%

Damping Factor:  greater than 50

Hum and Noise:  100 dB below 125 watts

Channel Separation:  70 dB minimum

Input Impedance:  20 k Ω at 1 khz

Input Sensitivity:  1,5 Volts

Power Requirements:   108 to 132 volts, 60 Hz, (60 watts at zero output and 560 watts at full output)

Dimensions (W x H x D):  482,6 x 180,1 x 330,2 mm ( 19" x 7,125" x 13")

Weight:  17,4 kg (38-1/4 lbs)

Heathkit AR-1515

From its half-inch tall LED frequency readouts to its extraordinarily low distortion, the Heathkit AR-1515 is the finest receiver heath has ever designed.

The Ar-1515's digital Readout is far more accurate thas dial-type tuning. Simply tune to the exact frequency you want. Signal-strength and center-channel meters then help you "zero in" on the strongest signal and lowestFM distortion. There's even an oscilloscope output to monitor multipath distortion.

The amplifier section meets the same high standards. That extra margin of performance assures clean, wide-range sound without audible strain or struggle on even the most complex musical passages. And you'll hear the music over a background of silence - hum and noise are 65 dB below full output in phono and 80 dB below full output on high-level sources.

The amplifier section is also unmatched in convenience. All the frequently used controls - volume, input selector, stereo/mono switch, tuning - are on the front panel. The secondary controls are concealed behind a hinged door. Convenient indicator lights on the front panel show, the input you've selected. The digit light only when listening to AM or FM and only the necessary tuning meters are illuminated - signal-strength only for AM, signal-strength and center-tune for FM.

The bass and treble controls act primarlly at the frequency extremes to compensate for room acoustic and program deficiencies while maintaining smooth midrange response. And the AR-1515's  preamp out/amp injacks allow it to be used with any audio equalizer, such as the Heathkit AD-1305.

The AR-1515 is even easy to build. Obviously the AR-15151 is a complex and sophisticated receiver, but its well thought out, modular design and color-coded wiring harnesses simplify assembly

Specifications

Amplifier Section

Frequency Response:  8 Hz to 45 kHz (+0 -1 dB);  4 Hz to 80 kHz (+0 -3 dB)

Intermodulation Distortion:  less than 0,08% (from 0,25 to 70 watts, full output)

Damping Factor:  greater than 60

Input Sensitivity:

Phono 1 , 2 :  2 mV

Aux, Tape , Dub. :  200 mV

Input Overload:

Phono :  greater than 100 mV

Aux, Tape,  Dub. :  greater than 10 V

Hum and Noise:

Phono (2 mV reference) :  --65 dB

Aux, Tape, Dub. (200 mV reference):  -80 dB

FM Monophonic

Frequency Response:  20  - 15,000 Hz  ±1 dB  

Antenna:  75 Ω or 300 Ω

Sensitivity:  1,8 µV

Selectivity:  100 dB

Image rejection:  90 dB

Mute Threshold:  0 -5 µV variable

FM Stereophonic

Channel Separation:  40 dB or greater at mid-frequencies;  35 dB at 100 Hz; 20 dB at 10 kHz; 20 dB (Nominal) at 15 kHz

Harmonic Distortion:  0,35% with 100% modulation

19 and 38 kHz Suppression:  60 dB

SCA Suppression:  60 dB

 AM Section

Sensitivity:  5 µV with 50 Ω direct input

Selectivity:  200 dB at 10 kHz

AM Antenna:  external static-shielded loop

Image Rejection:  70 dB at 600 kHz, 50 dB at 1400 kHz

General

Accessory AC Outlets:  One switched and one unswitched

Power Requirement:  120/240 V AC,  50/60 Hz

Dimensions (W x H x D):  21-1/2" x 6-3/16" x 15"

Weight (net):  35,8 lbs

Heathkit AA-100

 Value Leader in the Industry - The versatile and powerful AA-100 features 5 pairs of inputs like; magnetic cartridge, AM and FM tuners, stereo tape reocrder, FM stereo tuner and auxiliary; separate monophonic input, versatile  controls, (preamp input level, power amp input level, hum balance, ganged volume, balace and separation  and separate concentric bass and treble controls); three different speaker impedance (4, 8, 16 Ω); plus left, right and center channel speaker outputs.

Styling Matches the AJ-41, easy-to-own.  The luggage-tan vinyl-clad steel cabinet with polished trim and soft refracted lighted slide-rule dial matches the AJ-41 styling above. You enjoy this, deluxe features, performance and styling, at the unbelievable low price. 

 Deluxe Heathkit "Tube-Type" Stereo Amplifier.

Offers  versatile performance, finger-tip convenience and modern styling

AA-100 Features:

Hi-Fi rated ar 50 watts (25 watts per channel)

Five stereo input  and versatile controls

Mixed channel center speaker output

Separate monophonic phono input

Easy circuit board assembly

Matches the AJ-41 tuner in styling and performance

 Due to the equalization present in Phono and Tape Head positions, the meter readings for these inputs contain a considerable amount of random low-frequency noise, most of which is sub-audible.  Such noise is due to thermal agitation in tubes and resistors, contact resistance effects in electrolitic capacitors, power line variations, etc. In evaluating noise, the audibility of its various components must be considered. The extreme input sensitivity (1 mV) of the AA-100 Tape Head input must also be borne in mind.

The actual 60 Hz hum (and harmonics) included in the readings is very  small, compared to the mostly sub-audible noise components referred to above. As a matter of fact, the AA-100 is almost completely free from hum, for practical purposes.

Specifications:

Channels:  Two channel stereo.

Power Output:  

Monophonic :  50 watts

Stereophonic : 25 watts per channel

Music Power Rating: 

Monophonic :  60 watts (0.7% THD, 1 kHz)

Stereophonic :  30 watts (0,7% THD, 1 kHz)

Power Response:   30 Hz to 15 KHz  ±1 dB at 25 watts output per channel.

Harmonic Distortion:  

Less  than 0.5% at 25 watts, 1 kHz .

Less than 2% at 25 watts 30 - 15,000 Hz  (each channel).

Intermodulation Distortion:  less than 1% at 25 watts, 60 and 6,000 Hz signals mixed 4:1 (each channel).

Hum and Noise:  

Mag phono :   55 dB below 25 watts output at 6 mv sensitivity

Tape Head :  35 dB below 25 watts output.

Tuner and aux : 70 dB below 25 watts output.

Channel Separation:  42 dB  min. at 1 kHz  

Input Sensitivity (For 25 watts output per channel)

Mono  Mag. Phono :  1.5 mV

Stereo Mag. Phono :  1.5 mV

Tape Tead :  1 mV

Tuner :   0.2 V

Aux 1 & 2 :   0.2 V

Input Impedance:

Mag phono :  47 K Ω  (may be changed)

Tape  Head :  470 K Ω

Tuner & Aux :  250 K Ω each.

Outputs:  4, 8 and 16 Ω ; cathode follower tape recorder outputs.

Damping factor: 15

Channel Sepration:  42 dB minimum at 1 kHz  

Equalization:

Phono :  RIAA curve

Tape Head :  NARTB  tape playback curve,

Tone Controls:

Bass :  15 dB boost and 17 dB cut at 30 Hz

Treble :  12 dB boost and 20 dB cut at 15,000 Hz

Controls: Function switch (4-position); selector switch (6-position); balance control (total range, 16 dB); separation control; ganged level controls; dual-concentric bass & treble controls; phase and power switch.

Tube complement:  2 x EF86, 4 x 12AX7, 2 x 7199, 4 x 7591, 1 x GZ34, 1-selenium bias rectifier.

Power requirements:  117 volts, 50/60 Hz

Power  Consumption:  150 watts.

Power Outlets:  2 AC receptacles, 1 switched, 1 unswitched.

Dimensions (H x W x D):  5" x 15¾" x 13½" (allow 1" for cables at rear).

Shipping Weight:  34-1/2 lbs.

Net Weight:  28-3/4 lbs

Schematic Heathkit AJ-41

 Schematic of the Heathkit professional Stereo Tuner model AJ-41

Heathkit AJ-41

 Heathkit AJ-41 Tuner has many interesting features, some of which are quite unique. The Tuner will receive monophonic AM or FM , or stereo FM. Individual meters monitor AM and FM tuning, a neon lamp is incorporated to indicate when a FM stereo signal is received. Another feature is a FM squelch circuit, which eliminates between station noise when tuning across the FM band. Cathode follower output stages provide low line impedance to avoid hum and high frequency losses in the interconnecting audio cables. With a FM stereo output, the cathode followers perform separately as left and right channel output stages; on monophonic AM or FM, the two output stages are tied together and supply the same information to both the left and right channel amplifiers of a stereo system.

 Deluxe Heahtkit "Tube-Type" AM/FM and FM stereo Tuner

Features:

Built-in FM multiplex adapter

Broad-band circuitry for full fidelity

Automatic FM Stereo indicator light

Adjustable Automatic Frequency Control for drift-free reception

Stereo phase control for maximum separation and lowest distortion

Adjustable FM squelch circuit for low noise between stations

Preassembled tuning unit, prealigned coils

Deluxe Features For Deluxe Performance. Compare the price and features of this renowned Heathkit Stereo tuner. Here is deluxe styling with luggagetan vinyl-clad steel cabinet, polished anodized trim, and refracted lighting of the big slide-rule dial, matches the Heathkit AA-100 amplifier.

Here are convenience features for easy operation, finer performance. Just flip a switch and chose FM, FM stereo,or AM listening. In addition there's an automatic stereo indicator light, built-in stereo adapter, automatic frequency control for clear, drift-free reception, adjustable FM squelch to assure complete silence while tuning, and a stereo phase control for maximum station separation, minimum distortion.

 Heavy die-cast flywheels are used on the tuning controls to give smooth tuning action. A "unitized" chasis design provides for rigidity and ease of kit assembly before being incorporated into the final assembly.

Control versatility is essential to good performance from a high quality tuner. All controls are arranged to offer maximum versatility without an excessive number of knobs.

Completely separate circuits are used for the AM and FM portions of the Tuner to avoid compromising performance. The multiplex circuit is used only in the Stereo position of the Mode Selector switch. Silicon diode rectifiers are used in the power supply because of their long life, dependability, and the fact that essentially no heat is generated in this type of rectifier. A choke is used in conjunction with the silicon rectifiers to improve regulation and to minimize hum. The heavy duty, electrostatically-shielded power transformer isolates the circuitry from the power line.

For Added Convenience - there are individual AM and FM tuning meters, flywheel tuning action, built-in antennas plus external antenna connectors, a fidelity switch for normal or maximum AM fidelity; and a preassembled, prealigned front-end to insure professional performance.  Assembly takes just a couple of evenings.

Specifications:

FM Section

Tuning Range:  88 - 108 MHz

Intermediate Frequency (IF):  10,7 MHz

Antenna:  300 Ω balanced

Output Impedance (Cathode Follower):  variable to 4000 Ω

Output Voltage:  Nominal, 0,5 volt with 3 µV, (30% modulation in)

Quieting Sensitivity:

2 µV for 20 dB of quieting;

3 µV for 30 dB of quieting

20 µV for full quieting, 40 dB

Audio Frequency Response:  20 - 20,000 Hz, ±2 dB

Maximum Deviation Sensitivity:  5 µV, 400 Hz 100% modulation in,

Deviation Sensitivity:  20 kHz (1100 µV in)

Harmonic Distortion:  less than 1% (1100 µV, 400 Hz 100% modulation)

Intermodulation Distortion:  lesss than 1%

Image Ratio:  40 dB

Capture Ratio:  12 dB

AFC Correction Factor:  12 dB

Amplitude Modulation Suppression:  25 dB

Hum and Noise:  40 dB below 30% mod. (20 µV in)

FM Stereo Converter Section

Audio Frequency Response:  50 - 15,000 Hz ±2 dB

Subcarrier Bandpass:  23,000 - 53,000 Hz ±3 dB

Channel Separation:  30 dB at 1 kHz; 25 dB at 10 kHz

Hum and Noise:  -55 dB relative to 1 volt RMS output

Output Impedannce (Cathode Follower):  variable to 4000 Ω, each channel

Outputs:  Left - Right channel

AM Section

Tuning Range:  535 - 1620 kHz

Sensitivity, Normal Position: 

at 1400 kHz : 3 µV

at 1000 kHz :  4 µV

 at 600 kHz :  8 µV

Sensitivity Change, Normal to Maximum:  -5 dB

Intermediate Frequency (IF):  455 kHz

Antenna:  Built-in rod, with provisions fro external straight wire)

Output Impedance (Cathode Follower):  variable to 4000 Ω

Output Voltage:  Nominal 3 volt

IF Band Width: 

Normal :  14 kHz (6 dB down)

Maximum :  20 kHz (6 dB down)

Image Ratio:  1400 kHz (50 dB);  600 kHz (75 dB)

Harmonic Distortion:  less than 1%

Hum and Noise: 35 dB below 30% modultion (1000 kHz with 100 µV in)

IF Rejection Ratio:  1400 kHz (42 dB);  600 kHz (38 dB)

10 kHz Rejection:  40 dB

General

Tube Complement:  5 x 6AU6; 2 x 6BA6; 1 x 6BS8 or 6BZ7; 1 x 6AB4; 2 x 12AT7; 1 x 6AL5; 1 x 6BE6; 2 x 12AU7; 1 x 12BH7

Power Supply:  Transformer-operated, silicon rectifiers.

Power Requiremants:  117 V, 50/60 kHz

Power Consumption:  100 watts

Dimensions (H x W x D):

Overall :  5-1/4" x 15-1/2" x 14-1/4"

Panel Mouting :  4-1/4" x 14-1/2" (Cutout); 12-7/8" (Depth)

Weight [net/shipping]:  18,5 lbs / 22 lbs

Heathkit AA-151

 Easy-to-Built. Easy-to-Buy. That 's the AA-151. For ease of assembly, there are simple. Step by step instructions and large "exploded" diagrams.  For performance, there's the Heath patented Ultra-Linear output circuit for unusually fine specifications. And for good old-fashioned value, there's the easy-to-afford price.

 Features

28 hi-fi rated watts (14 per channel)

Stereo or Mono operation

4 stereo inputs

6 versatile controls

Matches the AJ-11 Tuner perfectly

 Versatile and Flexible Performance.

The AA-151 accepts any stereo or mono program source, offers complete finger-tip controls, and delivers 32 watts IHF music power. The 4-input selector switch lets you choose mag. phono, crystal phono, tuner, or auxiliary inputs.  The 6-position mode switch allows choice of both or either stereo signal. In addition, there are ganged volume controls, ganged tone controls for bass and treble; speaker phase reversal switch, filament balance controls, and accessory AC outlets.

Moder Styling Matches AJ-12 and AJ-32.

The steel cabinet is clad in tan vinyl with charcoal gray front panel and polished trim, matches the AJ-12 and AJ-32.

Specifications AA-151

Channels:  Two

Power Output: 14 W + 14 W per channel

Heath Hi-Fi Rating:  16 W + 16 W per channel

IHFM Music Power Output: 0,7% THD, 1 kHz

Power Response:  20 Hz to 20 kHz (=-1 dB) at 14 watts output per channel

Harmonic Distortion:  less than 2% (30 Hz to 15 kHz at 14 watts per channel)

Intermodulation Distortion:  less than 2% at 14 watts output per channel using 60 Hz and 6 kHz signal mixed 4:1

Hum and Noise: 

Mag. Phono input :  55 dB below 14 watts

Tuner , Crystal Phono :  65 dB below 14 watts

Channel Separation:  better than 45 dB

Input Sensitivity for 14 watt output each channel (tone controls in Flat position):

Mag. Phono :  0,004 V at 1 kHz

Crystal Phono :  0,2 V

Tuner, Aux :  0,2 V

Outputs Impedance:  4, 8 and 16 Ω

Damping Fcator:  10:1

Controls:  Dual clutched volume, ganged bass and treble, 4-position source selector, 6-position mode selector, speaker phasing switch

Tube Complement:  2 - 6EU7; 2 - 6AU6; 2 - 6AN8; 4 - EL84/6BQ5; 1 - GZ34/5AR4

Power Requirements: 117 volts, 50/60 Hz 130 watts

Export Model:  available for 115 - 230 V AC, 50/60 hz

Power Outlets:  2 AC receptacles, 1 switched, 1 unswitched

Dimensions (W x H x D):  15¾" x 5¼" x 11"

Weight Kit:  29 lbs

Heathkit AJ-32

 Enjoy Complete Listening With This Top-Value Heathkit AM/FM/FM Stereo Tuner in One Compact Unit at Low Cost.

Just a flick of a switch and you're up-to-the-minute with the latest news, sports, and music of Am; or the relaxing, quiet beauty of FM or FM Streo.

Added Performance at Traditional Heathkit Savings.

In addition to the features listed opposite, enjoy the "added performance" of complete controls; the AM fidelity switch that selects desired bandwidth for maximum selectivity or fidelity; level controls that adjust to suit your amplifier; built-in AM and FM antennas plus outside terminals; and effortless flywheel tuning.

 Features:

Bulit-in multiplex converter

FM Stereo Indicator Light

Variable AFC for drift-free reception

2 bar-type "Eye" tuning indicators

Stereo Phase Control for minimum distortion, maximum separation

Filtered stereo tape recorder outputs

 Matches The AA-151 In Stiling, Performance.

Handsomely housed in a sturdy steel cabinet clad in attractive tan vinyl with a charcoal gray front panel and polished trim, matches the AA-151.

Easy Assembly

The tuning unit is preassembled, prealigned fro quick, simple construction.

Specifications

AM Section

Tuning Range:  550 - 1600 kHz

Intermediate Frequency:  455 kHz

Usable Sensitivity (Normal position): 

1400 kHz - 10 microvolts (20 dB of quieting);

1000 kHz - 15 microvolts (20 dB of quieting);

600 kHz - 400 microvolts (20 dB of quieting)

IF Bandwidth:

Normal :  6 dB - 7 kHz

Maximum :  6 dB - 12 kHz

AM Antenna:  Built-in rod antenna with provisions for external  antenna and ground

Output Voltage (750 microvolts -30% mod.):  1 Volt

Image Rejection: 

1400 kHz - 40 dB

1000 Hz - 50 dB

600 kHz - 60 dB

Harmonic Distortion(750 microvolts - 95% Mod.):  less than 1%

Hum and Noise (5000 microvolts, 30% Mod.):  30 dB

IF Rejection:  1400 kHz - 30 dB; 600 kHz - 50 dB

FM Section

Tuning Range:  88 MHz - 108 MHz

Intermediate Frequency:  10,7 MHz

Antenna:  Balanced input for external 300 Ω antenna. Internal line anytenna

Output Voltage (30 microvolts -30% Mod.):  1 Volt

Image Ratio (30 microvolts - 30% Mod. ,98 MHz):  -45 dB

Harmonic Distortion (25 microvolts - 100% Mod. , 98 MHz):  less than 1%

IF Rejection (98 MHz):  -65 dB

FM Audio Response (20 - 20,000 Hz):  ±1 dB

AFC Correction Factor (Full AFC):  100 kHz per volt

AM Suppression:  -27 dB

Hun and Noise (25 microvolt, 30% Mod.):  -48 dB

Quieting Sensitivity:  20 dB - 2 ½ microvolts;

30 dB - 3 ½ microvolts;

48 dB - 30 microvolts (max. Quieting)

FM Stereo Converter Section

Audio Frequency Response:  50 - 15,000 Hz  ±2 dB

Subcarrier Bandpass:  23,000 to 50,000 Hz ±3 dB

Channel Separation;  30 dB or more at 1 kHz; 25 dB or more at 10 kHz

Hum and Noise:  -55 dB relative to 1 volt output

Output Impedance (cathode Follower):  Variable to 4000 Ω, each channel

Outputs:  left and Right channel

Power Requirements: 117 volts, 50/60 Hz 130 watts

Export Model:  available for 115 - 230 V AC, 50/60 Hz

Dimensions (W x H x D):  15¾" x 5¼" x 11"

Weight Kit:  23 lbs

Heathkit AR-1500A

 We've improved upon the Classic receiyer.

The tradition of heathkit stereo receiver superiority began in 1967 with the heathkit AR-15. then in 1971 came the Ar-1500. now, it's the AR-1500A, the world's classic receiver, improved once again. Design advancements include.

Phase lock Loop (PLL) multiplex demodulator with only one simple adjustment, your assurance of maximum separation, droft-free performance and long-term stability. Simplification of the AGC circuit resulting in significant improvements in AM performance. Improved output protection for better drive capability over taday's wider range of speaker impedances.

Now Easier To Build

In redesigning the AR-1500A, special care was given to making the kit even easier to build than before. A separate check-out meter is used to check out each step as assembly progresses. Factory-installed cable connectors are another new kitbuilding aid.

 Still tops in performance.

The precedent-setting performance specifications of the AR-1500 have, of course, been retained. Conservatively rated, the Ar-1500A puts out 180 watts, 90 per channel, into 8 ohms, with both channels driven, with less than 0,25% harmonic distortion. Two computer designed five pole LC filters and the 4-gang, front end combine for an FM selectivity beter than 90 dB with 1,8 µV sensitivity. And here are some things the specs won't show you. There are outputs for two separate speaker systems, two sets of headphones, preamp output, and monitoring of FM with an ascilloscope such as the Heathkit Audio-Scope. Standard inputs - all with individual level controls. Electronically monitord amplifier overload circuitry.

Specifications

Tuner FM Section

Monophonic:

Sensitivity:  1,8 µV

Selectivity:  90 dB

Image rejection:  100 dB

IF Rejection:  100 dB

Capture ratio:  1,5 dB

Harmonic Distortion: 0,5% or less

Intermodulation Distortion:  0,1% or less

Stereophonic:

Channel Separation:  40 dB or greater at midfrequencies; 35 dB at 50 Hz; 25 dB at 10 kHz; 20 dB at 15 kHz

Tuner AM Section

Sensitivity:  50 µV with external input; 300 µV per meter with radiated input

Selectivity:  20 dB at 10 kHz;60 dB at 20 kHz

Image Rejection:  70 dB at 600 kHz; 50 dB at 1400 kHz

IF Rejection:  70 dB at 1000 kHz

Amplifier Section

Dynamic Power Output per Channel:

Music Power Rating:  90 watts (8 Ω load);  1200 watts (4 Ω load);  50 watts (16 Ω load)

Continuous power Output per Channel:  60  watts ( 8 Ω load);  100 watts (4 Ω load); 40 watts (16 Ω load)

Power Bandwidth (for constant .25% THD):  less than 8 Hz to greater than 30 kHz

Frequency Response (1 watt level):  9 Hz to 80 kHz,  -1 dB

Harmonic Distortion:  less than 0,25% from 20 Hz to 20 kHz at 60 watts output

Intermodulation Distortion:  less than 0,1% with 60 watts output

Damping Factor:  Greater than 60

Channel Separation:  55 dB (Phono)

Output Impedance (each channel):  4 Ω through 16 Ω

Dimensions (W x H x D):  18-1/2" x 5-1/8" x 13-7/8"

Weight (less cabinet):  53 lbs