Here is a Stereo Tube Phono Preamplifier Kit that is easy to build and is just fun! The Phono Preamplifier utilizes two 5670 triode tubes. It incorprates an RIAA filter to compensate for the output curve of most Phono cartridges.
The Phono 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 PH Stereo Tube Phono Preamplifier comes in kit form (K-PH). It has all the resistors, capacitors, tubes, circuit board, and necessary hardware for mounting on a "bread board" provided (which is compatible with the amp you purchase or have previously purchased).
NOTE: The Phono Preamplifier, Preamplifier and Tone Control kits cannot be used together as they each have gain.
Page Updated January 2017
Model PH Stereo Tube Phono Preamplifier
Input Impedance = 47K ohms
Frequency Response = 20 to 20,000 Hz
with RIAA internal filter
Input = RCA phono connector
Output connections = Jumpers to Amplifier PC Board
Gain = 10 to 30 db - set by resistors
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.
If ordering separately specify which kit you already have, so we