Learning how to build a stereo tube preamp can help you get some classic sounds. Stereo tube amplifiers are very popular with musicians. A tube amplifier is generally very difficult to get and may turn out to be quite expensive as well. For this reason, you may try making your own amplifier using materials easily available at hardware stores. The method is also much cheaper than buying a stereo tube amplifier. A class A amplifier is one of the easiest stereo preamps to build. The only thing required is a vacuum tube triode. The whole thing can then be put together using a couple of electrical materials available in hardware stores.
To build a stereo tube preamp, you will need:
- One vacuum tube triode
- One MW resistor
- 100 KW resistor
- 1500 W resistor
- Electrical wire
- Electrical pliers
- Electronic solder
- Two ring terminals
- DC power supply, 24V
- DC power supply, 6V
- Using the electrical pliers, cut the wire into six equal parts. Strip off about half an inch of insulation from the ends of each piece of wire. Take an open end of the first piece of wire and join it with the grid terminal triode, twisting the wire to secure it firmly. Solder the connection with any of the leads on a one MW resistor. Solid connections will help with quality sound when building your stereo tube preamp.
- Take the open end of the first piece of wire and place it on any ring terminal. Solder the wire with the terminal. Take the second piece of wire. Place one end on the other terminal. Solder the terminal with the wire. The preamp needs to have good connections at each terminal.
- Take the free end of the second piece of wire. Twist it together with any one of the leads of the 100 KW resistor along with the terminal of the triode plate. Connect using solder.
- Take the third wire and join it with one of the free leads of the 100 KW resistor, and join the connection using electric solder. Take the open end of the third piece of wire and attach it to the positive terminal of the 24V DC power supply.
- Take one lead of the 1500 W resistor and twist it on the triode cathode lead. Connect with solder. Connect the open leads from this 1500 W resistor with the one MW resistor. Connect this end with one end of the fourth piece of wire. Attach using solder. Take the open end of the fourth wire and connect it with the negative terminal of the 24V DC power supply.
- Take the fifth wire and twist one of its ends with one of the leads of the terminal of the triode heater. Attach using solder. Take the sixth wire and attach one end with the remaining lead of the terminal of the triode heater. Connect using solder. Take the open end of the fifth piece of wire and connect it to the positive terminal of the 6V DC power supply on the stereo tube. Take the open end of the sixth piece of wire and attach it to the negative terminal of the 6V DC supply.
Remember, when you build your stereo tube preamp, check that the preamp's terminal for the input signal is the terminal that is attached to the first piece of wire. The terminal for the output signal should be the terminal attached with the second piece of wire.