3M DELTA Series - Page 7

used to monitor input, output, program, cue bias
and cue playback, These functions are selectable
from the front panel. Input monitoring (REC) is auto 
matically switched to output monitoring (PLAY) when
the machine is not recording. The primary cue tone
may be recorded at any time from the front panel 1
kHz cue control switch.
Delta Features
Mechanical
• Compact size — 1/3 rack width, 12" deep
(DI, II, IV)
13" deep (Dill)
Height 5-9/16" (DI, II. IV)
10-15/32" (D III)
• Modular construction
• Styling similar to Series 99 — neutral colors
• 1/2" deck assembly — tool plate aluminum —
anodized
• Extruded side, front, and rear panel
• New headblock — stable, compact, allows preci 
sion adjustment
• Improved cart guides
• Electrically Controlled Bottoming Solenoid
• Capstan motor — DC Servo, brushless with ball
bearings. Crystal referenced — can be strapped
for 3-3/4, 7-1/2, 15 IPS
• XLR connectors for inputs/outputs
• Vinyl clad and polycarbonate surfaces for lasting
finish and ease of cleaning
• Universal rack mounting
• On Dill, all 3 decks are removable
• Extensive use of mumetal shielding
• Long life, high quality switches — bifurcated wip 
ing contacts
• All front panel switches illuminated using 5 volt
long life bulbs
Electrical
• Toroidal power transformer
• Extended life, open face cylindrical heads
• Common P.C. cards for D-I, II, & III
• Microprocessor control
• State of the art audio using TLO Series and 5500
Series (5532, 34) opamps
• Electronically balanced input/output. Can be used
with or without x-formers (input can be bridging)
• Hi-speed recue standard on D-I, II
• Full 3 cue tone operation standard
• Either 150 Hz or 8 kHz cue detectors can be
strapped to initiate hi-speed cue
• Audio muting
• Non-repeat indicator w/start lock-out
• Flashing record lamp for rec set w/ 1 kHz disabled
• On D-IV — front panel access to:
1. Normal record (input)
2. Program play (output)
3. 1 kHz defeat (electronically latched)
4. 1 kHz add (timed tone)
5. Front panel actuation of test metering mode:
a. cue play/cue bias
b. program bias
• ICs and transistors socketed
• Soldermask on pcbs (both sides)
• Power supplies regulated
• Full remote controls including lamps
• Detachable line cord
• Stappable input level ranges
• Cart high speed cueing standard (Cue switch
mutes unless held depressed)
• DIV is universal recording amplifier for use with
DI, DU, and bottom deck of Dili
• All playbacks are field convertible to stereo
• Motor and control electronics (servo) are one
assembly — eliminates field matching)
• High frequency crystal referenced bias (120 kHz)
• Auxiliary start pulse
B. DELTA SPECIFICATIONS
1. Power Specification
A. 105 to 132 VAC or 210 to 264 VAC
B. 50/60 Hz
C. Power Consumption
1. Delta I 50 VA Typical
65 VA Maximum
2. Delta II 50 VA Typical
65 VA Maximum
1-2