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Hello Again! I'm back with a new Instructable! Wheeyy! In this 'able, I'll show you how to make a Low-Voltage (Around 60 Volts) Tube Pre Amplifier fo...
I've listed all parts youll need here. One thing I have to say before I write further. I cant' tell you the exact sizes of the holes etc you need to ...
At this step, I couldnt help you much. You need holes for : Tube Socket 2 Pots 2 6.3mm Jacks 2 Switches and for some Wiring that goes outside the case...
I think its easier if you put in the Parts first and then solder everything up.
Bend the pins of the Socket a bit apart. That makes soldering a bit easier. Then, put solder on every pin.
I'm sorry for the Hand-drawn Schematics, but I couldnt find any kind of software which could draw Tubes. If you dont' understand something, post a Com...
Grab the following parts : 2 100k Ohm 1 Watt resistors 1 68k Ohm Resistor And Join together like shown on the Pictures.
Grab the following parts (According to the new schematics): Jumper Wires 400v 1uF Cap 220k Resistor
... and the Coupling Capacitor between the two halfs of the 12AX7. And other connections...? Get these Parts: 2 4.7k Ohm Resistors 1 35v 2.2uF Cap 1 6...
Get some Jumpers out. And some Wire.
You've got it nearly finished! Time to add... High.. er LOW Voltage! Youll need a 60 Volt PSU for it. And something around 6.3 Volts for the Filament...
Well. Because this whole circuit wont Work very well without the Tube, Plug it in! Dont force it. it MIGHT take a while until you get it in. Then, t...
Now, youll have to apply power to it. Ive done that by Building some regulated switchmode Power supplies. One Step-up Converter for 60 Volts and one S...
If you are interrested in the SMPS,I got the Schematics for you. The Step Up converter is a bit more complex, but it aint as mind-breaking as it might...
Just made some tweaks at this Preamp and updated the Schematics. Now you got beautiful Computer-drawn schematics (; Notice: C2 is only if you want a...
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