Do It Yourself Audio
Model ZKIT4 - stereo tube gain stage
Create a single tube preamp or tube output stage for your CD player or DAC!.
ADD TO CART - MODEL ZKIT4 stereo tube gain stage
PRICE $25.00 BOARD ONLY
This is a circuit board that you can use to build a class A single-ended-triode stereo gain stage.
It could be used as the
heart of an extraordinary sounding preamp, or as a tube output stage in a
CD player. If you change the values of a couple parts this could
also be a wonderful gain stage in your next amplifier project.
It is set up for a 12AU7
with heater voltages between 10 and 12.6 volts applied to pins 4 and 5.
Drop the heater voltage down to 6.3 and you can use 6DJ8 and
similar tubes.
At exactly 2 x 2 inches square it makes for a clean install in your chassis with 5 holes - one for the tube, and 4 for the stand-offs.
ZKIT4
DETAILS BELOW
SCHEMATIC OF ZKIT4 CIRCUIT BOARD
SCHEMATIC OF SUGGESTED POWER SUPPLY - GOOD
SCHEMATIC OF SUGGESTED POWER SUPPLY - BETTER
NOTE: The OC2 is a 75 volt glow tube that will fire once enough load is placed on the tube. Some fire easier than others and some signal tubes draw more current than others. IF you have trouble getting the glow tube to fire and stay lit without flickering, you can load pin 2 with a 10K resistor to ground in most cases to solve the problem.
