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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.
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
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
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
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

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

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)

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

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)

Crosstalk (Reference 1 kHz at level noted)
-50 dB or better program to program*
-50 dB or better cue to program*

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

Head Configuration
NAB Stereo standard
NAB Mono factory order

Audio Input
Configuration Transformer Coupled; Input Impedance, 20K Ohm bridged; 600 Ohm selectable; 150 Ohm selectable
Level Selectable -18, -12, 0, +12, +18 dBm

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

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

Environment
Storage -40 to +85 C (-40 to +185 F)
Ambient +10 to +50 C (+50 to +122 F)

Mounting
Table Top Standard
Rack Mount - Option

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)

Weight
Reproducer 17.5 lb. (7,938 kg)
Recorder/Reproducer 18.5 lb. (8,392 kg)

* Reference level of 1 kHz @ 250 nW/m using a DRS Cart 2 Broadcast Cartridge

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This page last updated 7/31/2007