A5500 DIY Tube Microphone


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A5500 DIY

diy tube microphone

Large Diaphragm Tube Condenser DIY Microphone

The ultimate DIY microphone kit! 


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Get your hands on the first ever professional tube microphone do-it-yourself kit! 

This kit includes everything you need to build a professional large diaphragm tube condenser microphone.

Use the included components for an excellent sounding tube microphone. Or for those more adventurous DIYers, swap out components and create your own custom high-end tube microphone. Then sell it for $1000 or more!

15 day love it or send it back policy*

This kit is intended for intermediate to advance users. 

You should understand intermediate electronics and assembly techniques.

The step-by-step instructions are on diymic.com. You are expected to understand and read schematics and a circuit layout, solder, use a multi-meter etc.

However, the circuit is rather simple and clearly marked.

Approximate Specifications after assembly:

Type: large diaphragm pressure gradient vacuum tube condenser
Frequency response: 20Hz to 20 kHz
Polar Pattern: cardioid
Sensitivity: 14mV/Pa (@1kHz, 74dB SPL)
Output impedance: <200 ohms
Equivalent noise level: <17dB-A Max. SPL (@0,5%): 130dB

diy vacuum tube microphone kit

Kit Includes

Unpainted brass microphone body, Head-grill assembly, internal mounting cage assembly to mount circuit board, capsule, transformer and connector housings. 1 - Fully assembled power supply
1 - Power cable for power supply
1 - 7-pin tube microphone cable
Schematic, circuit board layouts, print out of assembled circuit
Components included

1 - 32mm/1in large diaphragm pressure gradient capsule (assembled)
1 - Plastic capsule mount
1 - Pre-amp circuit PCB
1 - Tube socket PCB
1 - Vacuum tube, 12AX7
1 - 9-pin tube socket
1 - 7-pin XLR male connector
2 - Ceramic insulators for both ends of C4
1 - Film Resistor,  1/2 W 10KΩ
1 - Film Resistor,  2W 100KΩ
2 - Film Resistor,  1/2 W 270KΩ
2 - Resistor, 22M or 51M
1 - Resistor, 200M
1 - Film Resistor, RJ 1/2 W 1-3KΩ
1 - Resistor, 1 KM
2 - Capacitor,  1μ/400V
1 - Capacitor,  1μ/250V,NP or
2 - Capacitor,  .022μ/630V
1 - Capacitor,  1000 pF/630V
1 - Capacitor,  100μ/25V
3 - Capacitor,  0.1μ/63V
1 - Capacitor,  1000μ/10V
1 - Ceramic Capacitor, 2-4pF
1 - Transformer, turns ratio 10:1
A5500 DIY Parts
The A5500 DIY kit has two versions.
The 7-pin connectors of the PSU and on the microphone are connected differently.
The version 1 microphone has eight leads from the bottom assembly, and the version 2 microphone has ten leads.
The PCB wiring connections are different and shown in the schematics.
Check the pictures below.
By clicking on the schematics and PCB layout, full-sized pictures will be displayed.

PSU Version 1
Schematics version 1
Circuit layout
PSU Version 2
Schematics version 2
Front PCB
Back PCB



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