3M DELTA Series - Page 8

3. Delta HI 120 VA Typical
135 VA Maximum
4. Delta VI 5 VA Typical
10 VA Maximum
2. Tape Speed
A 3-3/4 IPS, (9.5 cm/s);
7-1/2 IPS, (19 cm/s);
15 IPS. (38 cm/s);
B. High speed recue — 22.5 IPS (57 cm/s),
nominal
3. Capstan Motor
A Direct drive capstan
(10.0 mm diameter capstan shaft)
B. Brushless DC servo motor
C. D-I, D-II and D-III; electrolyzed stainless steel
shaft
D. Permanently lubricated ball bearings
4. Record/Play Flutter
A Record/Play maximum
0.15% DINWTDat 7.5 IPS.
B. Play maximum
0.12% DINWTDat 7.5 IPS.
Tape cartridge length 3-1/2 minutes
5. Speed Accuracy
A Better than +/-0.2%
6. Audio Output Configuration and Audio Impe 
dance
A Transformer coupled
Strappable for 150 ohm or 600 ohm (load
impedance) operation (source impedance is
50 ohms or 275 ohms respectively)
B. Transformerless output
(Source impedance is 150 ohms as factory sup 
plied; only for electronically balanced output.
no transformers)
7. Audio Output Level
A +18 dBm (at 1 kHz) for .5% THD or less, amp
distortion
(W/XFMR); +22 dBm transformerless clip level
B. Variable from 0 level to +18 dBm (Ref. 1 kHz
at 160 nWb/m) (Continously variable, "use-
able" range -18 dBm to +18 dBm)
8. Distortion
A Amplifier Distortion: Reproducer: 0.2% or less
total harmonic distortion, at 0 dBm @ 1 kHz;
0.5% or less THD at +18 dBm @ 1 kHz.
B. System Distortion: Reproducer: 1.5% or less
total harmonic distortion, 0.5% or less third
harmonic distortion. Specification by 1975
NAB standards.
9. Noise
A Signal to Noise: Measured with bias/no sig 
nal; ScotchCart in place with virgin tape at
7.5 IPS.
Mono
Stereo
54 dB 52 dB
(or better) (or better)
Signal to Noise: No tape running; ScotchCart
in place.
Mono Stereo
56 dB 54 dB
(or better)
(or better)
C. Squelch Noise — 70 dB or better.
D. Reference level of measurements 250 nWb/m
at 1 kHz recorded signal
10. Cross Talk
Measured at 1 kHz. (1975 NAB Standards)
-50 dB Min. separation between program
channels
11. Frequency Response
A +/- 2.0 dB from 50 Hz — 16 kHz
B. R/P 0 dB reference; 250 nWb/m at 1 kHz
(ScotchCart Tape)
12. Equalization
A 1975 NAB cartridge machine standard — ad 
justable for CCIR (Pot. adjustment)
B. Customer option/component reloading in
field 7.5 IPS only — 1964 NAB equalization
C. Fixed low frequency equalization; adjustable
high frequency equalization
13. Head Configuration — NAB, Mono/Stereo
14. Cue Signals
A NAB primary cue 1 kHz
B. NAB secondary cue 150 Hz
C. NAB tertiary cue 8 kHz
D. Open collector sinking signal (Ground switch 
ing) available upon sensing secondary or
tertiary cue tones maximum volts 25V, max-
1-3