V T - 7 3 7 S P Q U I C K S E T - U P O P E R A T I N G G U I D E

AC

ON

REV

ON PRE IN IN X10 IN X10 IN IN

IN

SC MIDSSHELFFREQUENCYHI - QFREQUENCYHI - Q EQUALIZER

35

75

50

100 200250

300

450Hz

40 350220

550

350

1k 1k41k6

2k

2k8Hz

250 2k5

1530 60

150

Hz

10k15k 20k

32k

Hz

BASS

- dB +24 24

4 4

66

1212

220

SHELF

LOW MID

- dB +16 16

4 4

66

1010

220

HIGH MID

- dB +16 16

3 4

65

1010

210

TREBLE

- dB +20 20

4 4

66

1212

220

150 1k2

OUTPUT0

40 10

4 4

66

88

22

- dB +

COMPRESSOR

HIGH Z INPUT

FILTER

HIGH

PHASE

GAIN

INSTRUMENT

MIC

METEREQ COMP

2010

32

AVALONVA C U U M T U B E

-

7 5 3 1012

dec ibe l s

VU + AVALON

DESIGN

v737sp

t +48v

VU

FAST SLOW FAST SLOW

- dB +30 20

10 5

1015

1520

250

RATIO1 20

4 7

83

102

65

INSTRUMENT

ATTACK RELEASE

THRESHOLDINPUTMODEINPUT COMPRESSIONPREAMP GAIN

2

22 35

3816

4210

3226

45

-28 +9- dB +LINE

LINE

0

30

45

40

55 7080

100

140Hz

35 120

60

FREQUENCYHIGH PASS

PREAMP GAINTrims input level

Line -20 to +10dB (+18dB)Inst -30 to +10dB (+28dB)Mic 0 to +40dB (+58dB)

INPUTSelects input source:Line XLR balanced,Instrument 1/4" jack

unbalanced, MicXLR balanced

INPUT MODEHigh gainLine +8dBInst +18dBMic +18dB

Phase invertsthe polarity of all(3) input sources

+48v phantom powerto Mic XLR input

THRESHOLDSets compressor-30dB to +20dB

COMPRESSIONSets ratio ofcompressor

from 1:1 to 20:1

COMPRESSSwitch (in) engages

compressor into signal path

EQ to COMPPlaces the EQ pre the compressor

METERSelects gain-reduction (in) or output (out)

INSTRUMENT1/4" unbalanced

mono phone jack.1 meg ohm high-z

input for keyboards,passive & active,

acoustic, bass andelectric guitars

FILTERVariable

bass cut filter6dB per octave

passive type30Hz to 140Hz HI PASS (in)

engages basscut filter

ATTACKVariable attack

time for thecompressor

2mS to 200mS

RELEASEVariable release

time for thecompressor

100mS to 5S VU

Recessedscrewdriver

adjust for 0dBwhen meter switch

(in) for gain-reduction

BASSBoost-cut

sets amplitudeof low range

-24dB to +24dBwith center detent

at 0dBShelf response

LOW MIDBoost-cut

sets amplitudeof mid range

-16dB to +16dBwith center detent

at 0dBPeak-dip response

HIGH MIDBoost-cut

sets amplitudeof mid range

-16dB to +16dBwith center detent

at 0dBPeak-dip response

TREBLEBoost-cut

sets amplitudeof high range

-20dB to +20dBwith center detent

at 0dBShelf response

OUTPUTTrims finaloutput level

-40dB to +10dBwith center detent

at 0dB

BASS4-position switchselects turnoverpassive designshelf frequency15Hz to 150Hz

LOW MIDVari frequency

35 to 450Hzx10

350 to 4k5Hz

HIGH MIDVari frequency220 to 2k8Hz

x102k2 to 28kHz

TREBLE4-position switchselects turnoverpassive designshelf frequency10kHz to 32kHz

AC POWERNote: Check

rear power inputconnector forcorrect local

ac voltage. Allowforty seconds for

the tubes tostabilize prior

to use.

EQ to SCRoutes the mid band

EQ sections (2) into the compressor side-chain for de-ess,

effects and frequency-selective compression.

AVALONClass A Vacuum Tube

DIRECT RECORDING SIGNAL PATH

POWER LEDindicates acpower is on

VU METERHigh qualityVU meter

indicates line output level

or compressorgain reduction0 VU= +4dB

VT-737SP

Bandwidth (Q)(in) = narrow(out) = broad

(Q=0.5)(Q=0.2)

Avalon Design is a division of Avalon Industries, Inc. 2000 c

Note: For the best sonic performance, a l l o w t h i r t y m i n u t e s f o r w a r m - u p .

When not in use, turn the ac off. This willextend the life of the electronics . . Enjoy!

Note: The bass and trebleEQ sections remain inthe audio path when the EQ switch is (in)