Black Box HG-2 User Manual Download Page 9

5

ANALOG DESIGN

INTRODUCTION

   WHAT CAN THE HG-2 DO?

Add Harmonics and Saturation (in multiple ways)

The main signal path of the HG-2 travels from the input transformers to the 

Pentode amplification stage, on to the Triode amplification stage and finally to a 

passive output attenuation before hitting a pair of 

Cinemag

 output transformers.  

The tubes naturally produce pleasing harmonics but each stage (Pentode and 

Triode) are voiced to produce more and more harmonics and 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, the HG-2 also has a parallel path that 

splits off directly from the input transformers.  This parallel path is fed into 

a pair of 12AX7 tubes, voiced for their own pleasing harmonics.  The “saturation” 

knob allows you to mix in as much of this parallel signal as you want with the 

“dry” signal before being recombined at the Pentode stage.  These three knobs 

(Saturation,Pentode and Triode) give you full control over how much and what 

type of saturation and harmonics you add.

Summary of Contents for HG-2

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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...

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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...

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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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