Black Box HG-2 User Manual Download Page 11

7

ANALOG DESIGN

GETTING STARTED

WHAT SETTING SHOULD I START WITH?

When setting up the HG-2, start with a neutral setting that closely matches the 

original signal.  To match, use the bypass to switch back and forth as you make 

adjustments. 

Pentode: 12 o’clock
Triode: 10-11 o’clock
Output: Adjust until levels match when bypassed

Parallel sat circuit: Off

Air: Off

NEUTRAL SETTING*

* It’s important to remember that the HG-2 is designed to saturate, so how 

hard you drive into it affects the settings.  The above settings will be neutral 

for the vast majority of unmastered mixes.  If your track is extremely hot or 

low in volume, adjust the signal feeding the input of the HG-2.

Adjusting the Pentode and Triode

From the neutral setting, begin by increasing the Pentode gain.  This will 

increase  the Pentode harmonics and eventually begin gentle saturation.  As 

you turn the Pentode up, turn the Triode down to compensate.  Now go back to 

the neutral setting and turn the Pentode up again but this time, use the output 

attenuation to compensate.  Notice the difference in response. 
Starting again from the neutral position, increase the triode gain, using 

the output volume to compensate for the volume difference.  Continue to 

experiment with driving both the Pentode and Triode in different amounts until 

you find a setting you like.

Adding the parallel saturation circuit

Once you have a Pentode and Triode setting you like and your output level peak 

matched, make sure the “Saturation” knob is all the way down and the “Sat. 

Freq.” switch is in the “flat” position, then engage the parallel saturation circuit 

via the “in/out” switch.  Slowly turn the knob clockwise to mix in more of the 

saturated signal and keep watching your peak meters.  You will notice that how 

much increase in peak or RMS levels you achieve is dependant on the settings 

of the Pentode and Triode.  If the Pentode and Triode are in a very “clean” 

setting, the parallel saturation circuit will add both peak and RMS.  If the 

main path is already in saturation, the parallel saturation circuit will further 

saturate the signal, resulting in higher RMS without much peak gain.

Summary of Contents for HG-2

Page 1: ...rev 3 0...

Page 2: ......

Page 3: ...ter This was 2009 and it became obvious that no one made what we were looking for so we created Black Box Analog Design and spent the next five years designing the HG 2 The HG 2 is specifically and un...

Page 4: ......

Page 5: ...perly Never under any circumstances operate this unit without being connected to a properly grounded circuit If you are unsure consult an electrician to make sure your outlet is properly grounded befo...

Page 6: ...es between two sets of 12AX7 tubes in the parallel saturation circuit Pentode gain control Selects between VU and PPM meter modes Triode gain control Engages or disengages high frequency air lift Left...

Page 7: ...ate and the front panel power switch will be inoperable Be aware that in the on position power is present inside the box even when the power switch on the front panel is in the off position 14 2AG pow...

Page 8: ......

Page 9: ...nd eventually saturation as you drive them harder Driving the Pentode quickly produces harmonics while pushing the Triode saturates the signal in a very pleasing way Along with the main signal path th...

Page 10: ...wing the user to try different tubes and switch between them in real time at the push of a button Increase RMS of your signal The same controls that allow you to enhance your signal with harmonics als...

Page 11: ...entode up again but this time use the output attenuation to compensate Notice the difference in response Starting again from the neutral position increase the triode gain using the output volume to co...

Page 12: ...rcuit In the Flat position full bandwidth is fed into the circuit allowing for saturation of all frequencies In the Low position only the low mid and bass frequencies are fed into the circuit This all...

Page 13: ...RATION IN OUT ALT TUBE LOW FLAT HIGH Sat Freq AIR BYPASS VU PPM HG 2 TRIM L R SESSION ____________________________________________ DATE _______________ NOTES TRACK ____________________________________...

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