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1962 OPERATORS’ MANUAL

12

Low Fine Tune:

Continually variable 6dB per octave shelving filter, providing up to 12dB of cut
or boost. This control may be used to add 'warmth' to the signal being
processed or to moderate excessive low frequency content.

Mid Fine Tune:

Continually variable 6dB per octave bandpass control providing up to 12dB
of cut or boost. The centre frequency of 1KHz has been chosen to emphasise
'bite' or presence.

High Fine Tune:

Continually variable 6dB per octave shelving filter  providing up to 12dB of cut
or boost. This control may be used to moderate excessive brightness or to
add a high frequency 'gloss'. 

In:

When depressed, the push button will place the Fine Tune EQ and the
Channel Insert rear panel Jack in circuit. A red status LED indicates such a
situation. When this section is bypassed, any processor connected via the
insert point will also be bypassed.

The Fine Tune EQ controls (and any external inserted process(es)) come
before the Peak Limiter in the signal side chain. Adding gain either via EQ
boost or by external processing will result in a greater degree of limiting
unless the input gain is reduced.

ENHANCE

The 1962 includes advanced circuitry designed to enhance
transient detail by dynamically controlling the phase and
spectral content of the programme material. The LEDs
above the Enhance controls show the degree of
enhancement taking place, and turning the Enhance control
clockwise increases the amount of processed signal added
back into to the programme material. If the Enhance controls
are rotated fully clockwise and dynamic material is processed, the yellow LEDs will seem
to be illuminated constantly. In reality, dynamic enhancement will still be occurring, but the
peaks may be so close together that the LED will appear to be lit continuously.

The Enhance circuitry comes before the Peak Limiter in the signal side chain.
Although only small amounts of additional level will be generated in normal
use, high settings of the Enhance controls may result in more frequent
Limiting unless the input gain is reduced.

Low Enhance:

The low frequency enhance circuit is a level dependant filter designed to
emphasise low frequency harmonics according to the dynamic nature of the
programme material. At low signal levels, the degree of enhancement is
greater than at higher signal levels, which has the result of increasing the
subjective loudness of the material.

The control is continually variable and is designed to be adjusted so that the
LED above illuminates periodically. If the input signal is near the maximum
operating level (0dB on the input meter) then no low frequency enhance will

Содержание 1962

Страница 1: ...i 1962 DIGITAL VACUUM TUBE PRE AMP OPERATORS MANUAL...

Страница 2: ...THER ORAL OR WRITTEN EXPRESSED OR IMPLIED THE MANUFACTURER MAKES NO OTHER WARRANTY EITHER EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTIC...

Страница 3: ...ge 8 Limit page 8 Microphone Pre amplifier page 9 Auxiliary Input page 9 Line Input page 10 High and Low Pass Filters page 11 Fine Tune EQ page 11 Enhance page 12 Tube Drive page 13 Stereo Mix page 14...

Страница 4: ...uit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Unauthorised changes or modification to this system can void the users auth...

Страница 5: ...m x 5mm THE MAINS INPUT FUSE MUST BE RATED AT 250mA WHERE THE MAINS INPUT VOLTAGE SWITCH IS SET TO 230 VOLTS AC AND 500mA WHERE THE MAINS INPUT VOLTAGE IS 115 VOLTS AC CAUTION MAINS CABLE DO NOT ATTEM...

Страница 6: ...extremely low noise balanced input circuitry followed by true high voltage tube amplification enabling modern microphones to take on the characteristics of older tube models Phantom power is individu...

Страница 7: ...l For high quality location recording the 1962 makes the perfect partner for a DAT machine combining the functions of stereo mic preamp with the capability to output high resolution digital data with...

Страница 8: ...onnect the power inlet earth but instead try disconnecting the signal screen on one end of each cable connecting the outputs of the 1962 to the patchbay If such measures are necessary balanced operati...

Страница 9: ...g of multiple 1962s only one need be fitted with a D62 digital converter This option saves on cost and also provides a convenient method of mixing especially where no digital mixing facilities are ava...

Страница 10: ...position The status LED illuminates to confirm this mode has been selected The output socket fully conforms to the EMC standards if the unit is to be used where it may be exposed to high levels of dis...

Страница 11: ...Never disconnect this unit from the mains supply earth If the unit is to be used at a power input voltage which is different to that as supplied the following procedure must be carried out See followi...

Страница 12: ...en enabled will prevent clipping in situations where the maximum input level cannot be determined with accuracy Use of the limiter also makes it possible to run the output closer the digital peak leve...

Страница 13: ...tely 3 bits of digital data If the Peak LED illuminates the gain is too high and should be reduced accordingly Phase Rev Depressing this button inverts the phase of the microphone input signal only No...

Страница 14: ...achieved by the input stage of a typical high quality recording console When the tube and EQ sections are out of circuit the line preamp provides a high quality minimum signal path to the output makin...

Страница 15: ...e of interference The High Pass filter is also helpful in reducing the level of the fundamental frequency in mains hum though it will not remove the harmonics that cause mains buzz Low Pass A continua...

Страница 16: ...by dynamically controlling the phase and spectral content of the programme material The LEDs above the Enhance controls show the degree of enhancement taking place and turning the Enhance control cloc...

Страница 17: ...fed into the Limiter stage to increase This will result in increased limiter activity Tube Drive A continually variable control that regulates the amount of tube colouration Note that even at the cont...

Страница 18: ...ent to use the high quality digital output stage of the 1962 if fitted Channel Pan This control pans positions the channel signal between the left and right stereo outputs When a conventional stereo m...

Страница 19: ...yellow LED is flashing an unrecoverable power brownout glitch has caused the DSP to mute its digital outputs Switch the power Off and On again to restore normal operation REAR PANEL CONTROLS There are...

Страница 20: ...rol is selectable on two internal jumper links See configuration jumpers section on page 19 In all configurations the audio signal to the D62 passes through a Soft clip circuit therefore short transie...

Страница 21: ...the remainder bits For example when using a 16bit multitrack machine to record a stereo 24bit signal tracks 1 2 and 3 or 5 6 and 7 must be selected The third channel sounds like white noise and is us...

Страница 22: ...KHz 10dB A particularly effective setting combining subjective neutrality with a worthwhile increase in dynamic range and high tolerance to post HF EQ 6 Shaped dither above 14KHz 20dB 7 Shaped dither...

Страница 23: ...Channel Output Level control It is less desirable option for the Mix section and the Digital Source Chs channels feed to be made post level control for several reasons 1 Digital output noise will be i...

Страница 24: ...ales invoice and a detailed description of the problem Authorised returns should be prepaid and must be insured All Drawmer products are packaged in specially designed containers for the best adequate...

Страница 25: ...gain 0 01 Line Input at 0dBu 0 025 Mic Input at 0dBu 0 01 D62 specification with LINE input 0dBu all effects disabled CROSSTALK 105dB 0dB gain THD n 1Khz 2dB soft clip 70dB 0dB gain THD n 1Khz 20dB 9...

Страница 26: ...1962 OPERATORS MANUAL 22 BLOCK DIAGRAM...

Страница 27: ...Q CHANNEL OUTPUT LEVEL CHANNEL OUTPUT LEVEL OUTPUT LEVEL DITHER CHAN 1 PAN CHAN 1 PAN SAMPLE RATE WORD LENGTH STEREO STEREO POWER ENHANCE ENHANCE TUBE DRIVE TUBE DRIVE IN IN IN IN IN IN IN IN IN IN LO...

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