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Project Horizon now features a selectable gain module which allows a quick change of input resistor values
combined with jumpers for a quick high/low setting adjustments
DEFAULT QUICK
CHANGE RESISTOR
VALUES ARE 30K
Selecting custom resistor values to change input gain:
- Actual gain is tube dependant. For example, a 12AU7A will have far less gain than a 12AX7
- The high gain setting is fixed at 20dB (again variable depending on tube used – but is a good rule of thumb)
The low gain setting is defaulted at 14dB. However one may make or order custom modules to raise or lower the
LG / low gain jumper setting. Examples:
- 10K resistors will increase gain by +6dB (gain of 20)
- 15K resistors will increase gain by +3dB (gain of 17)
- 30K resistors (default value for the LG setting) 0dB change (gain of 14)
- 45K resistors will further decrease gain -3dB (gain of 11)
- 60K resistors will further decrease gain by -6dB (gain of 8)
These options are made available to help mate the amplifier with the widest selection of equipment possible
INPUT GAIN CAN BE CANGED +/-
USING THESE JUMPERS
USING THE DEFAULT RESISTOR
MODULE (20K RESISTORS) GAIN
OPTIONS ARE 14 OR 26dB
DEPENDING ON TUBE
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