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 ITC
Series 1 Audio Cartridge Machines
Introduction
ITC Series 1 Audio Tape Cartridge machines combine quality,
features, performance and affordability. Series 1 cartridge machines were available in mono or stereo
recorder or reproducer versions. Three NAB cue tones and high-speed
cue were standard. Recorders offered front-panel 1 kHz add and defeat
functions.
A crystal-referenced, brushless, DC servo, capstan motor provides
excellent wow and flutter performance, speed stability and cool
operation. The quality drive system eliminates
problems commonly associated with other methods using out-dated,
less reliable AC hysteresis synchronous motors (heat generation,
voltage-induced speed variations) or belt-drive systems (speed
variations, higher maintenance costs).
Several features enabled the Series 1 to
provide cool, reliable operation. Using an advanced solenoid/cam
design , the pressure roller is positioned
consistently against the capstan shaft and leveraged by the cam,
thereby lowering the solenoid holding requirement. The benefits are
cool operation, longer component life, less wow and flutter and
improved tape stability. The bottom line – the overall effect of
these unique design features allowed the Series 1 to have a
one-piece, unventilated outer case providing protection against the
harsh studio environment of dust, ashes, coffee and liquids – all
detriments to machine life.
Reliability
Series 1 cartridge machines incorporate reliable features,
such as a Teflon-coated solenoid plunger, DC servo motor, stable
deck assembly and bifurcated, self wiping switch contacts to provide
long life. PC boards plug into the motherboard and are fastened to
the rear panel for additional support. All logic is discrete
CMOS.
Easy to Maintain
The Series 1 chassis is designed to slide out of its case for easy
top access to the heads and pressure roller. PC boards have card
pulls and are legend screened for easy identification of parts.
Only
one extender card is needed for service, and each board is keyed to
ensure replacement in the correct slot.
Mechanical Features
 | The cast aluminum deck is precision machined and
nickel-plated for temperature stability and years of wear.
| The complete chassis, supporting the deck assembly,
power supply, PC boards and front panel slides out of the steel
case for easy servicing.
| Virtually all assembly screws mate with PEM brand
self-clinching fasteners for easy disassembly and reassembly.
| A crystal-referenced, brushless, DC-servo capstan motor
provides low heat generation, low wow and flutter and high-speed
cue. The motor is not subject to fluctuations in line voltage
and frequency, as are hysteresis and synchronous motors.
| Quiet, air-dampened, dual-winding 24 VDC solenoid uses a
Teflon-coated plunger for long life and reliable operation.
Solenoid air-dampening is adjustable.
| Unique, new solenoid/cam pull up
mechanism (patent applied for) eliminates the need for a clevis
assembly and holds the pressure roller securely in place. A
cam-type, cross-shaft clamp lowers the pull requirement on the
solenoid while running tape, significantly reducing overall
temperature rise within the chassis.
| Precision, micro-adjust head blocks are deck-mounted and
provide accurate and repeatable height, zenith and azimuth
adjustment. Independent set screws have lock units to assure
long- term stability.
| Deck-mounted tape guides are made of wear-resistant,
self-lubricating Kevlar and can be accurately adjusted in a
vertical plane simply by using a Phillips screwdriver.
| Adjustment-free cart hold-down mechanism is silent,
stable and consistent. The cartridge stop is cast into the deck
to ensure precise location of the cartridge.
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Operating Features
| Three internal cue tones standard – 1 kHz, 150 Hz and 8 kHz
| Standard high-speed cueing
| Front panel 1 kHz add and defeat functions
| Cue track recording and playback access
| Simultaneous cue tone generation/detection
| Power On/Off switch. Cue tone levels are adjustable.
| Cue tone frequencies are crystal-referenced for accuracy and
reliability.
| Deck-mounted opto sensor for multiple user-selectable
functions, such as stereo routing of mono signals, use of noise
reduction, etc.
| Separate front panel LEDs for visual tone verification on 150
Hz and 8 kHz cue tone detection. Additional LED indicators for
power, loop (1 kHz detect defeated) and audio
| LED bar graph meters and recessed input level controls
| Convenient meter-select switch on recorder allows easy front
panel selection of play, record, cue or bias levels
| Separate low and high frequency equalization adjustments for
precise audio set up
| 24 V, 40 W switching power supply, universal input accepts 105
- 264 VAC (450-250 mA), 50-60 Hz and is designed to meet
applicable agency standards.
| Grounding lug and IEC-certified line cord provided at rear of
unit
| Fuse drawer for convenient service access
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User-Selectable Features
| Audio mute on detection of EOM cue tone. EOM can be either 150
Hz or 8 kHz.
| Slow flashing ready LED indicates cartridge has been played.
| Replay lock-out with fast flashing LED reduces
possibility of operator playing same cartridge twice in a row
| Motor speed of 3-3/4, 7-1/2 or 15 PS
| Motor runs continuously or upon cartridge insertion
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Electrical Features
| Self wiping switch contacts are bifurcated and silver-plated
for reliability and long life.
| Modular mother-daughter board design with plug-in PC boards
| CMOS logic used throughout
| All PC boards are tested to demanding standards.
| Plug-in PC boards mount to the motherboard and are fastened to
rear panel for further support and stability. Plug-in boards
have card pulls and are keyed to insure proper replacement.
| Solder-masked PC boards have gold-plated edge connectors.
15-turn sealed potentiometers for precise adjustments
| Audio inputs and outputs are transformer coupled for
reliability and isolation from outside interference.
| All indicators are LEDs for efficiency and to reduce lamp
replacement.
| Only one extender card needed for service
| Rear panel "D" connectors provide easy link for
audio switching and remote control
| Compact 1/3 rack width. Can be table-top or rack-mounted
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Specifications
Power
| 105 to 264 VAC, 450-250 mA, 50-60 Hz |
Tape Speed
| Record/Play – 7-1/2 IPS (19 cm/s) standard, 15 IPS (38
cm/s) selectable, 3-3/4 IPS (9.5 cm/s) selectable
| Cue (3X Speed) – 22-1/2 IPS (57.15 cm/s) standard,
Defeated when set for 15 IPS, (38 cm/s) play speed 11-1/4
IPS, (28.6 cm/s) when set for 3-3/4 IPS, (9.5 cm/s) play speed |
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Speed Accuracy
| Better than ± 0.2% |
Capstan
| Direct Drive
| Brushless DC Servo Motor
| Electrolyzed, Non-Magnetic, Stainless Steel Shaft
| Permanently Lubricated Ball Bearings
| Crystal-Referenced, Phase-Locked Controller |
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Flutter
| Playback – Less than 0.12% DIN weighted at 7-1/2 IPS (19 cm/s)
| Record/Reproducer – Less than 0.15% DIN weighted at 7-1/2 IPS (19cm/s) |
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Audio Output
| Configuration – Transformer Coupled; 80 ohms source
impedance
| Level – + 18 dBm; Variable; -18 dBm to +18 dBm
| Amplifier Distortion: (THD= Total Harmonic Distortion)
Less than 0.2% THD at 0 dBm, Less than 0.5% THD at +18 dBm
| System Distortion – Less than 1.5% THD; Less than 0.5%
third harmonic |
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Noise (Reference 1 kHz at level noted)
| Mute: 70 dB or better*
| No tape running*– Stereo >58 dB; Mono >60 dB
| Virgin tape with bias*– Stereo >55 dB; Mono >57 dB
(Noise measurements are 20 Hz to 20 kHz band limited, unweighted) |
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Crosstalk (Reference 1 kHz at level noted)
| -50 dB or better program to program*
| -50 dB or better cue to program* |
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Response (Reference 1 kHz at level noted)
| ± 2 dB from 50Hz to 16kHz* |
Equalization
| 1975 NAB/1981 IEC (50 mSec) standard
| 1964 NAB (50 mSec and 3150 mSec) selectable
| 1971 IEC (70 mSec) selectable |
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Head Configuration
| NAB Stereo standard
| NAB Mono factory order |
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Audio Input
| Configuration – Transformer Coupled; Input Impedance, 20K Ohm bridged; 600 Ohm selectable; 150 Ohm selectable
| Level Selectable – -18, -12, 0, +12, +18 dBm |
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Metering
| LED Fast Acting Averaging Response 10 Segments (-20, -10, -7, -5, -3, -1, 0, +1, +2, +3 dB)
| Selections – Program Play (auto switched in play-run), Program Record, Program Bias, Cue Play/Cue Bias |
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Tape Capacity
| NAB size AA (1964 and 1975) |
Start Time
| 100 msec minimum; Adjustable via air dampening |
Stop Time
| Tape Travel – < 100 mSec typ. (Varies according to
the type of cartridge and length of tape)
| Audio Mute – < 100 mSec |
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Environment
| Storage – -40° to +85° C (-40° to +185° F)
| Ambient – +10° to +50° C (+50° to +122° F) |
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Mounting
| Table Top Standard
| Rack Mount - Option |
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Size
| Height – 5-7/32 inches (3 RU) (13,256 cm)
| Width – 5-9/16 inches (1/3 rack) (14,127 cm)
| Depth – 15-1/4 inches (38,735 cm) |
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Weight
| Reproducer – 17.5 lb. (7,938 kg)
| Recorder/Reproducer – 18.5 lb. (8,392 kg) |
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* Reference level of 1 kHz @ 250 nW/m using a DRS Cart 2
Broadcast Cartridge
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