What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Centrex by Pioneer RH-60 8-track


8-track home stereo recording deck
Recording or playback, a new adventure in 8-track with fast-forward and "One-All_Endless" function.
Now, you can create your own musical universe in 8-track. With the RH-60, part of the new Centrex line of home stereo systems and equipment by Pioneer, this elegantly crafted unit records as easily and superbly as it plays back.
Hard-to-beat features for perfect recording and perfect playback.
Simplified tape indexing
The RH-60's fast-forward button and program end indicator lamp work with one another to make tape indexing, which is crucial for precise recording, easier than ever. Just insert the cartridge, press fast-forward, and the lamp will light up-with the tape stopping automatically - to indicate that the tape has been properly indexed.

Recording level adjustment knobs
Accurately marked for both left and right channels, these enable you to adjust the recording level to the input. No guesswork you see everything on the corresponding level meters.

Large recording/playback level meters
For at-a-glance cheks of input level when recording, output level when playing back. Precisely calibrated from  -20 dB to +3 dB.

Automatic power switch on/off
When the cartridge is inserted, power automatically goes on; when the cartridge is pulled back, the power is switched off.

Fast-forward and pause buttons
Features normally found in higher-priced decks, these make recording or playback operations more convenient.

Versatile function selector
Press "One" to record or play back just one program, "All" for continuous Program 1-4 recording or playback and "Endless" for non-stop, repeat operation.

Light-up indicators
The RH-60 will never leave you in the dark. There's tape program indicator to tell you at a glance which program is in play, a program and indicator and a recording indicator. They make recording and playback easy, sit-back-and-enjoy-it affairs.

Specifications
Tape:  any 8-track cartridge
Tape Speed:  9,5 cm/sec (3-3/4 ips)
Wow and Flutter:  no more than 0,15% (WRMS)
Fast-Forward Time:  approx. 2 x normal speed
Frequency Response:  70 - 13,000 Hz
Crosstalk:  more than 45 dB
Signal-to-Noise Ratio:  more than 45 dB
Input Level:
Mic :  0,85 mV (typical)
Line :  85 mV (typical)
Input Impedance:
Mic :  36 k
Line :  100 k
Output Level/Impedance: 
Line :  580 mV/less than 200  
Erasing Ratio:  more than 50 db
Semiconductors:  13 Transistors; 19 Diodes; 1 Thyristor
Controls Provided:  "One-All_Endless" function switch, recording level, REC, fast forward, pause and program selector
Power Source:  AC 120 V 50/60 Hz
Power Consumption:  less than 25 watts
Dimensions (W x H x D):  375 x 115 x 275 mm (14-3/4" x 4-1/2" x 10-7/8")
Weight:  5,5 kg (12 lb 3 oz)


I like

Rotel RA-930AX amplifier


Rotel Stereo Integrated Amplifier RA-930AX

Specifications
Continuous Power Output:  30 wattts per channel, min. RMS both channels driven into 8 ohms from 20 to 20,000 Hz with no more than 0,03% Total Harmonic Distortion
DIN Output:  50 watts per channel (1 kHz, 4 , 1 % Total Harmonic Distortion)
Music Power:  110 watts
Total Harmonic Distortion (20 to 20,000 Hz from Aux): 
Continuous Rated Power Output :  no more than 0,03%
Continuous 1/2 Rated Power Output :  no more than 0,03%
1 watt per Channel Power Output, 8  :  no more than 0,03%
Intermodulation Distortion (60 Hz : 7 kh = 4 : 1)
Continuous Rated Power Output :  no more than 0,03%
Continuous 1/2 Rated Power Output :  no more than 0,03%
1 watt per Channel Power Output, 8  :  no more than 0,03%
Output IMpedance
Speaker :  4  minimum
Headphone :  8 - 2,000
Damping Factor:  180 (20 to 20,000 Hz, 8 )
Input Sensitivity/Impedance: 
Phono :  2,5 mV/47 k
CD, Tuner :  150 mV/20 k
Tape, Aux : 150 mV/20 k
Overload Level (T.H.D. 0,5%, 1 kHz)
Phono :  180 mV
CD, Tuner :  5 V
Tape, Aux ;  5 V
Frequency Response
Phono :  20 to 15,000 Hz ±0,3 dB (RIAA Std)
CD,Tuner :  10 to 40,000 Hz ±1 dB
Tape, Aux :  10 to 40,000 Hz ±1 dB
Tone Control
Bass :  ±6,0 dB at 100 Hz
Treble :  ±6,0 dB at 10 kHz
Signal-to-Noise Ratio (IHF, A Network)
Phono :  80 dB
CD, Tuner, Tape, Aux : 100 dB
Miscellaneous
Power Requirement:  120 V, 220 V, 240 V;  50/60 Hz
Power Consumption:  180 watts
Dimensions (W x H x D):  440 x 92 x 304 mm (17-3/8" x 3-5/8" x 12")
Weight:  5,9 kg (13,0 lbs)


I like

Rotel RT-930AX tuner


Rotel AM/FM Stereo Tuner RT-930AX
Specifications
FM Tuner Section
Usable Sensitivity:  12,8 dBf/1,2 µV (75 )
50 dB Quieting Sensitivity:
Mono :  17,2 dBf/2 µV (75 )
Stereo :  40,7 dBf/30 µV (75 )
Signal-to-Noise Ratio (at 65 dBf):
Mono :  75 dB
Stereo :  70 dB
Total Harmonic Distortion (at 65 dBf)
Mono (1 kHz) : 0,08%
Stereo (1 kHz) :  0,3%
Frequency Response: 30 to 15,000 Hz ±1,5 dB
Capture ratio:  1,5 dB
Alternate Channel Selectivity:  63 dB (±400 kHz)
Spurious Response Ratio:  95 dB
Image Response Ratio:  65 dB
IF Response Ratio:  90 dB
AM Suppresion Ratio:  60 dB
Stereo Separation:
100 Hz / 1 kHz / 10 kHz :  35 dB / 40 dB / 30 dB
Subcarrier Product Ratio:  60 dB
SCA Rejection Ratio:  70 dB
Output Level :  720 mV
Antenna Input:  75  unbalanced
AM Tuner Section
Sensitivity
AM :  350 µV/m
LW :  750 µV/m
Selectivity
MW :  27 dB
LW :  25 dB
Signal-to-Noise Ratio
MW :  55 dB
LW :  55 dB
Image Response Ratio
MW :  40 dB
LW :  40 dB
IF Response Ratio
MW :  60 dB
LW :  60 dB
Antenna:  Loop Antenna
Miscellaneous
Power Requirement:  120 V, 220 V, 240 V; 50/60 Hz
Power Consumption:  10 watts
Dimensions (W x H x D):  440 x 72 x 257 mm (17-3/8" x 2-7/8" x 10-1/8")
Weight:  3,2 kg (7,04 lbs)


I like

Philips F7112 turntable



Philips Synchro Drive Automatic Turntable


Specifications
Type:  Automatic-return belt drive type
Turntable Speeds:  33-⅓ and 45 rpm
Wow and Flutter: 
DIN :  less than 0,1 %
WRMS :  less than 0,05 %
Rumble:
Din A :  lower than -40 dB
DIN B :  lower than -60 dB
Tracking Error:  smaller than 0°9' / cm
Stylus Force:  adjustable from 1 - 3 gf (10 to 30 mN)
Mains Voltage/Frequency:  110 - 120 V 220 - 240 V, 50/60 Hz
Power Consumption:  max. 4 W
Dimenisons (W x H x D): 420 x 120 x 362 mm (cover closed)
Weight:  3,2 kg


I like

Sugden A21 serie Two amplifier


The original A21 amplifier was hailed by many leading authorities as the most significant advance in amplifier design technique for many years.
The Series Two version incorporates certain improvements to the original model, including increased power output, improved input sensitivites and disc overload factor, headphone socket, nad superb new styling.

Construction is to very high standards, and the interior illustration indicates the neat layout. High quality components only are used to ensure long term reliability - note particularly the large electrolytic capacitors and mains transformer which immediately instill a feeling of confidence.
Unconditionally stable, superbly styled, a nd elegantly presented in a handsome teak case, this amplifier sets entirely new standards of high quality reproduction not only withinm but well beyond its price range.

Power Output
The rated power output of 12 watts RMS per channel is more than adequate for the vast majority of domestic situations even when using relatively insensitive loudspeakers. Once again it must be stressed that it is the quality of the watts which is important. With the current trend towards lower impedance loudspeakers, the A21 series two has been designed to produce its full output into 8 ohms, although it may be used with absolute safety to drive loudspeakers of higher impedance (at reduced total output)

Specifications
Power output:  12 watts RMS per channel (24 watts RMS both channels simultaneous operation)  at clipping  level into 8 Ω
Output to Tape Recorder:  Direct connection from raadio and aux, inputs, 150 mV from disc amplifier when correctly loaded.
Input Sensitivity
Magnetic cartridge :  2,5 mV into 68 k Ω, equalized to RIAA
Caramic cartridge :  50 mV into special input circuit
Radio, Tape, Aux :  150 mV into 200 k Ω flat response
Overload Capabilities:  25 dB on disc inputs; infinite on radio, aux, and tape inputs
Total Harmonic Distortion:  better than 0,25% at 10 watts, mainly 2nd and 3rd harmonic, negligible proportion of high order harmonics and reducing in proportion with reducing power to give less than 0,01% at 1/2 watt  - i.e. the average power listening level.
Frequency and Power response:  30 Hz to 20 kHz ±1 dB
Signal-to-Noise Ratio:
Radio, tape, Aux :  80 dB
Disc :  70 dB
Interchannel Crosstalk:  typically 40 dB 20 Hz to 19 kHz, dependent upon input load impedance
Control Knobs
Bass :  ±14 dB at 40 Hz
Treble ;  ±14 dB at 10 kHz
Volume:  Logarithmic (channel balance ±1 dB maintained to 50 dB attenuation)
Balance :  ±6 dB for 180° rotation, either channel eliminated at limits of rotation
Push Buttons to select
Inputs :  Disc, Radio, Aux, Tape
Rumble Filter :  Built in on disc input, 18 dB/octave below 30 Hz
High Frequency Filter :  12 dB / octave above 7 khz
Function :  Mono, Stereo, Input Right, Input Left
Power Consumption:  70 watts max
Dimensions (W x H x D):  394 x 127 x 229 mm (15-1/2" x 5" x 9")
Weight:  11,3 kg (24 lbs)


Sugden A48 amplifier (1973)


The A48 integrated stereo amplifier is a "Luxury" development of the A21 amplifier. It is in many ways similar , almost identical in size and appearance , except for the 10 buttonn push button banl instead of 6. briefly the facilities are varied as follows:
Power Output
Doubled to 40 W RMS per channel ( 80 W from both channels simultaneous operation)
Filter Facilities
L.F. filter - switchable and operating on all inputs with a terminal slope of 18 dB/octave
H.F. filter - single turnover point and slope replaced by three turnover points of 4 kHz, 7 kHz and 10 kHz with a choice of two slopes -6 dB or 18 dB/octave
Disc Input Sensitivity
A further sensitivity position of 10 mV is available in addition to the 2,5 mV position to cater for such high output cartridges as the ortofon with transformer. The overload factor also increases by the same scale of four.

Quiet Facility
A switch position providing a quiet listening facility with an attenuation at mid frequencies of 16 dB only 8 dB low frequencies with the response contoured to the difference in the equal loudness curves of the ear. This facility, where normal volume is set and then 'quiet" selected is to be preferred to the so called :loudness" compensation of a volume control which has no relevance to the incoming signal level.

Specifications
Power Output: 40 watts RMS per channel(both channel driven at clipping  level into 8 Ω)
Total Harmonic Distortion:  less than 0,1% mainly 2nd and 3rd harmonic, negligible proportion of high order harmonics and reducing in proportion with reducing power
Frequency Response:  30 Hz - 20 kHz ±1 dB
Output to Tape Recorder:  Direct connection from radio and aux, input, 200 mV from disc amplifier when correctly loaded at average modulation
Input Sensitivity (25W level 8 Ω):
Radio, Tape, Aux :  100 mV into 200 k Ω flat response
Phono Magnetic Cartridge:  2,5 mV into 47 k Ω equalized RIAA standard
Overload Capabilities:  100 mV on magnetic disc input; infinite on radio, aux, tape
Signal-to-Noise Raatio (30 phon weighting): 
Radio, Tape, Aux :  80 dB
Phono :  70 dB
Interchannel Crosstalk:  typically 40 dB 20 Hz - 10 kHz, dependent upon input load impedance
Rumble Filter:  Buil in on disc input, 12 dB/ovctave below 30 Hz
Control Knobs:
Bass : ±14 dB at 40 Hz
Treble :  ±14 dB at 10 kHz
Volume :  logarithmic (Channel balance ±1 dB maintained to 40 dB attenuation)
Balance :  ±6 dB for 180° rotation, either channel eliminated at limits of rotation
Push Buttons to select
Inputs :  Disc, Radio, Aux, Tape
L.F. Filter :  18 dB/octave below 70 Hz
H.F. Filter :  turnover 4, 7 or 10 k Hz, slope 6 or 18 dB / octave
Function :  Mono, Stereo, Input Right, Input Left
Power Consumption:  140 watts max
Dimensions (W x H x D):  400 x 130 x 230 mm (15-1/2" x 5" x 9")
Weight:  11 kg (24 lbs)


Audio Innovations Alto amplifier

 Audio Innovations has a long established range of high quality audio equipment. The marque has founded its reputation on a range of widely acclaimed valve amplification. It has always been the ambition of Audio Innovations to manufacture products with the best possible performance at any given price. To date, this has precluded the use of transistor circuitry as it was not felt to offer equivalent performance to similarly priced valve designs.

In recent years there has been widespread demand for an entry level Audio Innovations amplifier that would combine the performance for which the company aesthetic elan. The Alto is the response to that demand. It is an affordable high quality amplifier dedicated for use with Line Level sources. The experience gained during the evolution of the highly regarded L2 Line pre-amplifier emphasised the importance of handling these higher level signals with particular care. It is vital that the input selection, attenuation and following gain stage are designed to minimise compression and corruption of the signal while at the same time allowing it to be coupled with unrestricted bandwidth to the power stages of the amplifier.

Audio Innovations places great emphasis on reproducing music with a high level of tonal and dynamic coherence. This consistency, regardless of level or pitch, is fundamental to the accurate reproduction of instrument timbre and is absent in almost all transistor electronics. The Alto circuit configuration addresses the key areas where problems occur while its inherent simplicity allows a more faithful representation of the music to be presented to the loudspeakers.

Internally the Alto is constructed to the same exacting standared as our more expensive valve amplifiers. The circuit boards is CAD "in house" designed. Close tolerance metal-film resistors and high quality signal coupling capacitors are used throughout. Input sockets are gold plated and the bi-wireable speaker terminals are heavy duty binding posts which will accept banana plugs, spades or bare wire.

The Alto ofers the facility to operate up to four line inputs as well as two tape recorders, and will therefore integrate easily into most domestic audio systems. With looks and performance that belie it's price the Alto represents a genuine alternative for the style conscious audio enthusiast.
Specifications
Output Power (at 1 kHz , 8 Ω ):  35 watts
Input Sensitivity (full Power):  265 mV RMS
Input Impedance:  47 k Ω
Frequency Response:  20 Hz - 100 kHz (-3 dB)
Speaker Impedance: 4 to 16 Ω
Inputs (Line Level):  4
Tape Loops: 2
Max. Power Consumption:  400 watts
Dimensions (W x H x D):  430 x 300 84 mm
Weight:  6,5 kg (shipping)


Audio Innovations - The First Audio Amplifier


The Audio Amplifier Series from Audio Innovations challenges a number of traditionally held beliefs, the most fundamental of which is the insistance that inn order for an amplifier to have a sufficient dynamic range, it must have a very high static power output. The second main misconception is that the amplifier must have low distortion; the third being the bandwidth nevessary to reproduce the audio apectrum.
The First Audio Amplifier is the first amplifier to significantly deviate from these design criteria. It is also first commercially available amplifier using the Direct Heated Triode, this being the most linear and load tolerant amplifying device available.

Special Features and Facilities
7,5 watt Pure Class A
Direct Heated Triodes type 684G or 2A3
No overall or local feedback employed
Fully hardwired circuit. No Printed Circuit Board
Handmade paper in oil capacitors for best possible signal transfer.
Non-magnetic resistors
Signal input wired with Audio Note 99,99% pure silver cable type AN-S
Cathode biased output stage
4 Ω , 8 Ω , 16 Ω output impedances, switchable on the back fascia

Rotel RCD-930AX CD player


Features of the RCD-930AX
This CD player uses a Pulse Width Modulated 1 Bit Dual Digital to Analog Converter with a Second Order Delta Sigma noise Shaping Circuit. This is followed by a digital filter equivalent to 8x Oversampling. RCD 930 AX ia a good sounding CD player that will offer a lively, entertaining source of music for your stereo system.
The Display is designed to be very informative . It will provide more information if you require by pressing the appropriate buttons on the front panel or on the  remote control. The Remote control duplicates all of the controls on the front panel and also has Direct Access keys for the track on the CD.

Specifications
Frequency Response:  20 - 20,000 Hz ±0,8 dB
Total Harmonic Distortion:  <0 1="" at="" khz="" p="">
Channel Separation:  >90 dB at 1 kHz
Signal-to-Noise Ratio:   >90 dB
Speed Accuracy, Wow and Flutter:  Quartz crystal Accuracy
Digatal to Analog Converter:  1 Bit Pulse Width Modulated
Power Requirements:  AC 115 or 230 Volts 50/60 Hz
Power Consumption:  30 watts
Dimensions (W x H x D):  440 x 72 x 298 mm (17-3/8" x 3-5/6" x11-3/4")
Weight:  4,2 kg (9,2 lbs)


Rotel RA-920AX amplifier


Integrated Stereo Amplifier

Specifications
Continuous Power Output:  20 watts per channel, min. RMS both channels driven into 8 Ω  from 20 -20,000 Hz with no more than 0,03% Total Harmonic Distortion
DIN Output:  35 watts per channel (1 kHz, 4 Ω , 1% T.H.D.)
Music Power :  75 watts
Total Harmonic Distortion(20 to 20,000 Hz from AUX):
Continuous Rated Power Output :  no more than 0,03%
Continuous 1/2 Rated Power Output :  no more than 0,03%
1 Watt per Channel Power Output, 8 Ω  :  no more than 0,03%
Intermodulation Distortion (60 Hz :7 kHz = 4:1)
Continuous Rated Power Output :  no more than 0,03%
Continuous 1/2 Rated Power Output :  no more than 0,03%
1 Watt per Channel Power Output, 8 Ω  :  no more than 0,03%
Output Impedance
Speaker :  4 Ω  minimum
Headphone :  8 - 2,000 Ω 
Damping Factor:  180 ( 20 - 20,000 Hz 8 Ω  )
Input Sensitivity/Impedance:
Phono :  2,5 mV/47 kohm
CD, Tuner, Tape Aux :  150 mV/20  k Ω
Overload Level (T.H.D. 0,5%, 1 kHz)
Phono :  180 mV
CD, Tuner, Tape, Aux :  5 V
Frequency Response:
Phono :  20 to 15,000 Hz ±0,3 dB (RIAA standard)
Cd, Tuner, Tape, Aux :  10 to 40,000 ±1,0 dB
Tone Control
Bass :  ±6 dB at 100 Hz
Treble :  ±6 dB at 10 kHz
Signal-to-Noise Ratio (IHF, A network)
Phono :  78 dB
CD, Tuner, Tape, Aux :  98 dB
Power
Requirement:  120, 220, 240 V 50/60 Hz
Consumption:  120 watts
Dimensions (W x H x D):  440 x 92 x 304 mm (17-3/8" x 3-5/8" x 12")
Weight:  5,1 kg (11,2 lbs)

Kenwood KL-777 loudspeakers


To reproduce in clear sound without distortion anything from the earth-shaking basso profundo of pipe organ to delicate overtone of a violin or the sharp sound of cymbals … this is the requirement speakers  must fullfill as an outlet for sound, . In its challenge to surmount this difficult objective, Kenwood so far has marketed numerous excellent speaker systems.
Based on our ampie past experiences, we now have completed the model KL-777, a power ful 15", 4-way , 6-speaker system.
The large diameter 15" woofer rock beautifully reproduces basso profundo which will even rock the room. Treble and mid-range are handled by two squawkers and two tweeters. A full range of ultra-high frequencies is freshly reproduced by new acoustic material called "mylar film" used in the corn type super tweeter.
The front grille is of the "bow line" design giving the set a classic appearance to accent a room-interior. When the grille is removed, it will show the buffle of refined finish, on which the level control is attached for adjustment of tone quality suitable for the room.

Woofer.
The newly developed powerfull 15", free-edge type woofer reproduces the fundamental a area with minimum distortion. This woofer, being specially designed for the air-suspension model, has successfully been made compact cabinet for the 15" class. The effective range is 800 Hz or below.

Mid-range
The most important range of 800 Hz - 5,000 Hz in music is reproduced by two 5" cornt-type mid-range, parallelly connected. They richly reproduce the mid-range. Being parallelly arranged, their allowable input has been increassed and effixiency improval.

Horn Tweeter
The two horn tweeters, which reproduce treble crisply, are parallelly arranged for improved directivity and increassed allowable input.

Super tweeter
The new acoustic material called "Mylar film" is used in the super tweeter which handles the cone above 10,000 Hz. The normal corn using fiber material is somewhat non-uniform in inner structure due to directional peculiarities of fiber. This is apt to cause split vibrations at high keys.
"mylar film" being of even and uniform structure does not give split vibrations at high keys. Also, because a small quantity is used, ultra-high frequencies beyond the audio frequency can be beautifukky reproduced without distortion.
It being of small diameter and corn type, the directivity is also greatly improved.

Network
The network may appear to be of little relation to the tone quality. However, it could cause distortions near the crossover points or damping inferiority in ultra low frequencies. Model KL-777 takes a full scale network of 12 dB/oct with the ferrite core which gives less magnetic loss. The copper wire used for voice coils can  amply endure the overload and help avoid distortions due to interventions near crossovers or damping inferiority in ultra-low frequencies.

Tone Selector
The tone selector is positioned in the front panel for easy operations.
"Soft" tone is suitable for room in which there is insufficiency in bass or where treble along are reflected.
"Clear" tone is for a boomy room which has insufficient absorption of bass or in which treble alone are absorbed.
"Normal" tone is for a normal room which may be say, in between the above two.

Cabinet
The front grille is of the "bow line" design giving a classic and calm appearance as an accent for the room interior.
Despite the large woofer used, it is comparatively compact and slim facilitating free setting. The front buffle is finely finished and, thus, one may remove the front grille and enjoy its professional appearance. The grille can be easily removed by hand.

Allowable Input
With its maximum input of 100 W, it is capable of reproducing large sound. Further, it can be safely used in combination with an amplifier of large output.
Sensitivity
The air-suspension type model is considered characteristic and advantageous with its compact enclosure and capability to reproduce ultra-low frequencies. In contrast, however, its sensitivity is not favorable. Therefore, unless an amplifier of a large output is used, it might not effectively perform its function.
Unlike other air-suspension type models, the KL-777 has gained high sensitivity of 102 dB and can fully perform the function with and amplifier of small output.
Speaker terminals
The one-touch connection terminal has been newly adopted for simple yet firm connection of cords.

Specifications
Mounted Speakers:
Woofer :  15" free edge type
Mid-range :  2 x 5" corn type
Tweeter :  2 x Horn type
Super Tweeter :  Corn type
Enclosure:  Acoustic suspension type
Maximum Input Power :  100 W
Sensitivity:  102 dB
Frequency Response:  25 - 22,000 Hz
Crossover Frequency:  800; 5,000; 10,000 Hz
Crossover Network:  12 dB/oct
Impedance:  8 Ω
Dimensions (W x H x D):  16-1/4" x 25" x 11"
Weight:  49,4 lbs
Special Features:  Built-in 3-step tone selector

Chartwell PM 100 loudspeakers


The Chartwell PM100 loudspeaker system is a breakthrough in compact loudspeaker design and is intended for use in situstions where space is at a premium, but musical accuracy must not be compromised.

Many small loudspeaker systems suffer from lack of deep bass response and their acoustic  output is unnaturally coloured in the mid-range, but Chartwell research engineers have developed a bass-reflex cabinet incorporating a ducted  port enabling natural reproduction of sound throughout the entire sudio spectrum down to 50 Hz and below, a frequency not always accomplished by speakers several times the size of the Chartwell PM 100.

A 25 mm soft-dome radiator HF unit and a new specially developed long-throw 165 mm bass/mid bextrene cone unit are combined with a 10 element crossover network. More than usual care has been taken in the crossover network design to ensure the input impedance of the system does not vary significantly over the audio frequency range. This reduces the demand on the driving amplifier which would be less liable to break into instability. All these factors ensure that the very high standard which has become the hallmark of Chartwell products is maintained.

Specifications
Drive Units: 
Bass/Mid :  165 Chartwell
High :  HD12-9D25 Son-Audax (modified)
Crossover Frequency:  3,000 Hz
Power handling:  40 watts RMS. Suitable for amplifiers rated up to 100 W on speech and music
Frequency Range:  50 Hz - 20 kHz ±3 dB
Nominal Impedance:  8 ohms
Cabinet Volume:  15 litres
Dimansions (W x H x D):  240 x 460 x 205 mm
Weight:  7,5 kg
Finish:  teak, Walnut, Rosewood, Black oak

JVC QL-F6


Fully-Automatic Quartz Turntable
Features
Coreless DC Motor with Quartz Servosystem
JVC Super Servo Frequency Generator
Variable "Q" Oil-Damped Tonearm
Fully-Automatic Arm Operation with Memory Repeat
Front Operation Convenience

The JVC QL-F6 is full of new and useful features. Namely, for higher speed accuracy, we've added another speed-correction system to the renowed JVC Quartz servosystem. For higher tracking accuracy, we've added a new oil damping system to our New Gimbal Support. And for low acoustic feedback, we've used a bottom board made of newly-developed H.D.P. compoud - heavier and more solid than conventional plastics - in combination with a solid aluminum die-cast cabinet. Further improvements are made even in the smallest of parts. What improvements do they offer your ears? Here the QL-F6 at your nearest dealer - your ears will know the answers.

Variable "Q" Oil-Damped Tonearm.
The tonearm of the QL-F6 is on JVC's New Gimbal type support, known for low friction and high sensitivity. But JVC has made its performance even better by adding to it our new variable "Q" oil damping system. Advantages are:
1) Damped "Q" (low-frequency resonance) results in better tracking
2) Sensitivity is high, with the support critically controlled
3) The user never needs to replace or replenish oil
4) Resistance to acoustic feedback is higher
5) The "Q" can be adjusted by a pair of controls - one for horizontal and one for vertical - to match the cartridge's compliance.
JVC'scomputer-asisted "K&K Method" was the creative force behind this innovative development.

JVC's New Double-Quartz Servosystem
In addition to the conventional JVC Quartz servo- the one that incorporates a phase comparator - there's another Quartz servosystem inside the QL-F6; the F-V converter makes the use of reference Quartz crystal rather than a more conventional reference voltage generator. Thus the rock-steady platter speed is made still more accurate. You cannot find another turntable offering steadier and more reliable speed control.

JVC's coreless motor is accurately controlled by these two dependable servos to rotate the platter with unimpeachable constancy. Besides, it vibrates very little and generates high torque (1,2 kg/cm) for a coreless motor, thanks to the newly-developed push-pull drive circuit. Finally, the JVC Super Servo FG (Frequency Generator) is built inside the motor to detect any speed error and help keep the platter spinnung accurate, always.

Specifications
Motor Section
Motor:  Coreless, DC type, FG servomotor
Servo System:  Phase-locking to the quartz oscillator
Drive System:  Direct drive
Speeds:  33- and 45 rpm
Fine Pitch Adjustable Range:  +_6%
Wow and Flutter:  0,025% (WRMS)
Signal-to-Noise Ratio:  more than 78 dB (DIN-B)
Speed Detection:  Frequency generator
Starting Torque:  more than 1,2 kg-cm
Speed Deviation:  within 0,002%
Load Characteristic:  0% (with 170g total tracking force)
Drift:  0,0001 %/H
Power Characteristics:  0% (±10 V)
Temperature Characteristics:  0,00005 %/C
Platter:  32,7 cm
Tonearm Section
Type:  Statically-balanced oil-damped tonearm
Effective Arm Length:  233 mm
Overhang:  15 mm
Weight Range Including Headshell:  13 - 20 g
Cartridge Section
Type:  Moving magnet (MD-1025EB)
Frequency Response:  10 Hz - 25,000 Hz
Output 3 mV (1 kHz)
Channel Separation:  25 dB (1 kHz) load Resistance:  47 - 100 k Ω
Compliance:
Dynamic :  10 x 10¯⁶ cm/dyne
Static :  30 x 10¯⁶ cm/dyne
Stylus:  Dt-ZIEB, 0,3 x 0,7 mil (diamond, elliptical)
Optimum Tracking Force:  1,75 g ±0,25 g
General
Power
Supply :  AC 110/ 120/ 220/ 240 V, 50/60 Hz
Consumption :  15 watts
Dimensions (W x H x D):  456 x 142 x 400 mm
Weight:  11 kg