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Microphone build guide (U47, 2019 version)
This guide will explain how to build an excellent multipattern tube microphone.
All components are of the highest quality: Styroflex and Wima capacitors, 1% metal
film resistors, a special quality EF806S tube, selected for noise and most important of
all, a high quality microphone capsule.
But first a word of warning:
Do not touch anything inside the microphone when the power supply is
connected. The microphone works with high voltages, that in some situations
can be lethal. When you work on the microphone, ALWAYS disconnect the
power supply. Even when the power supply is switched off, the capacitors
inside the power supply will keep a high voltage for a long time.
As long as you keep this in mind, there isn't very much that can go wrong.
It might be a good idea to read through this information before you effectively start
assembling the microphone, so you will have an idea about the steps that will follow.
The microphone electronics are build on 2 printed circuit boards (PCB's).
We will assemble the separate boards one by one and build them later together.
We will start with the small rounded printed circuit board.
First place and solder the tube socket to the PCB.
Take care that one pin goes through the bigger hole, without touching the printed
circuit board.
Next, solder a 1 G.ohm resistor (brown/black/grey) on the solder side between the
PCB and the pin in the bigger hole. Keep some distance between resistor and PCB.
Now solder the 1000pF Styroflex capacitor to the junction of the 1 G.ohm resistor and
the pin of the tube socket. We leave the other free end 'floating' in the air for the
moment. This is how if should look when the small PCB is later mounted in the
microphone body. (The other resistor you see on the picture, will be added later.)
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Summary of Contents for MIC&MOD U47
- Page 1 Microphone build guide (U47, 2019 version) This guide will explain how to build an excellent multipattern tube microphone. All components are of the highest quality: Styroflex and Wima capacitors, 1% metal film resistors, a special quality EF806S tube, selected for noise and most important of all, a high quality microphone capsule.
- Page 2 Now mount the 1 K.ohm resistor (brown/black/black/brown) on the component side of the small PCB. Also mount and solder the 47µF capacitor on the component side. (The side where the tube socket already is.) Take care that the capacitor is mounted with the correct orientation, the “-“...
- Page 3 Make sure the wires rest on the core of the PCB, so that the transformer can not move. Now cut the excess length of the 1 mm. wires on the solder side of the PCB and solder the ends. Now the transformer is fixed in place on the PCB. Cut the transformer wires to length, strip and tin them and solder the wires to the points indicated on the picture: Now mount the PCB in the microphone body with four M2x5 screws, at the side...
- Page 4 Next, mount the microphone capsule to the saddle with the supplied screws and washers. DO NOT TOUCH THE MEMBRANES! Lead the wires of the capsule through the holes in the bottom plate of the headbasket compartment. It may be a good idea to mark which wire is coming from the front membrane, and which one is coming from the rear membrane.
- Page 5 If you make the microphone cable yourself: You connect all pins in the XLR Male and female connector 1:1, so: pin 1 of the male XLR to pin 1 of the female XLR etc. Pin 4 and 7 (center) are connected together and are also connected to the shield (screening) of the cable.
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