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GETTING STARTED 

4

6

7

8

9

10

D.I. INPUT

High Impedance Class A JFET

MIC PAD 

20 dB Reduction Ahead of 
Input Transformer

PHANTOM POWER

Activates 48 V

HIGH PASS FILTER ON 
SWITCH

-3 dB at 82 Hz, Discrete Class 
A

OUTPUT ATTENUATOR

Attenuates from 0 to Infinity

FRONT

1

2

3

4

5

INPUT GAIN SWITCH

5dB Steps From 30 to 80

MIC INPUT IMPEDANCE

1200 

Ω

 or 300 

Ω

 when pressed

LINE

Switches from MIC/D.I. to Line

PHASE

Flips phase 180º

HIGH PASS FILTER FREQ

-3 dB at 82 Hz, Discrete Class 
A

REAR

1

SLOT CONNECTOR

Gold Plated

1

2

3

4

5

7

8

9

10

6

1

500 SERIES CONNECTOR 

+

(4 LEVEL)

OUTPUT - (4 LEVEL)

INPUT - (4 LEVEL)

INPUT + (4 LEVEL)

GND

Summary of Contents for 73 JR II

Page 1: ...USER MANUAL MONO MIC LINE PREAMP D I 500 Series Module 73 JR II August 2022 Rev 1 0...

Page 2: ...quipment which makes them virtually unobtainable for the great majority Now it s possible to obtain that same sound with a brand new piece that will give you all the problem free heavy duty use you ll...

Page 3: ...I Eliminate one gain stage and run only up to 70 dB of gain A real deal 73 mic pre must have 3 gain stages for a total of 80dB of gain Taking the first gain stage out and maxing out the other 2 allows...

Page 4: ...A OUTPUT ATTENUATOR Attenuates from 0 to Infinity FRONT 1 2 3 4 5 INPUT GAIN SWITCH 5dB Steps From 30 to 80 MIC INPUT IMPEDANCE 1200 or 300 when pressed LINE Switches from MIC D I to Line PHASE Flips...

Page 5: ...ONDENSER MIC USB COMPUTER LINE INPUT AUDIO INTERFACE D I USB COMPUTER LINE INPUT AUDIO INTERFACE OUTPUT 1 73 JR II SLOT 1 D I INPUT ACTIVATE LINE D I SWITCH ACTIVATE 48V FOR CONDENSER MIC OUTPUT 1 INP...

Page 6: ...OR CONDENSER MIC USB COMPUTER LINE INPUT AUDIO INTERFACE OUTPUT 2 OUTPUT 1 73 JR II SLOT 1 INPUT 1 INPUT 1 73 JR II SLOT 1 LINE MONO OUTPUT KEYBOARD CONDENSER MIC 6 Another popular use for the LINE mo...

Page 7: ...to drive a load of 600 D I input impedance Greater than 2 M unbalanced Maximum output Greater than 26 dBu into 600 internally terminated THD Less than 0 025 at 1 kHz Less than 0 05 at 100 Hz Frequency...

Page 8: ...t by 20 dB ahead of the input transformer Condenser microphones don t seem to work with 73 JR II Make sure the red 48 V button is pressed in to activate the phantom power sent to the microphone There...

Page 9: ...date The warranty excludes problems due to normal wear abuse shipping damage or failure to use the product in accordance with the specifications Heritage Audio shall not be liable for damages based up...

Page 10: ...RECALL SHEETS 10 Session Title Track Connected Equipment Date Instrument Notes Switch ON Switch OFF Session Title Track Connected Equipment Date Instrument Notes Switch ON Switch OFF...

Page 11: ...www heritageaudio com HERITAGE AUDIO C Alfonso G mez 38 3C 28037 Madrid Spain Tel 34 917 266 189 info heritageaudio com...

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