Here is a Stereo Tube Preamplifier Kit that is easy to build, and is just fun! The Tube Preamplifier utilizes a 5670 triode. The Preamplifier is compatible with all "L" Series Amplifiers, it gets its B+ and filament voltage from the Amplifier board and can provide 10 to 30 db of gain.

The PL Stereo Tube Preamplifier comes in kit form (K-PL). The kit comes complete with all the resistors, capacitors, tube, circuit board, and necessary hardware for mounting on a "bread board" provided (which is compatible with the amp you purchase or have previously purchased).

Model PL Stereo Tube Preamplifier

Specifications:

Input Impedance = 100k ohms

Frequency Response = 20 to 20,000 Hz

Input output connections = Jumpers to Amplifier PC Board

Gain = 10 to 30 db - set by a resistor

Two channel

Caution: These amplifiers may be operated as supplied, however voltages in excess of 240 volts are present on the board and the tubes get very hot. It is advised that the amplifier be mounted in a well-ventilated metal enclosure to reduce the potential of fire or shock.