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LRR Tube Preamp (rear)
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diyAudio Member

Registered: September 2010
Location: Pacific Northwest
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My latest "Northwest Amplifiers" Tube Preamp project with tube preamp, amplifier and headphone amp. It has customized Baxendall tone stack with bass & treble. Options include 100W Class "D" amplifier module. This is a 12V DC tube preamp running a 12U7 and 12K5. This is not a plate starved 12AU7! It adds tube warmth to ANY amplifier front end while adding tone control. It can be used stand alone with it's 10W SS amp module that is built in for a practice amp or you can plug in the 100W amplifier module and drive the living daylights out of any 4 - 8 ohm speaker cabinets. Amp module has built in attenuator load.

Preamp 10 -12 dB gain (tube) Clean and beautiful
Line out 16 - 20 dB gain (tube with three stages of gain
Built in 10W solid state amp driven by tube preamp for bedroom practice.
Aux In & Out for effects looping
Headphone amplifier 150 ohms nominal at 5V p-p
100W Class "D" add on module driven from preamp module.
Date: Tue October 26, 2010

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