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Golden Age Project GA-47 Large-Diaphragm Tube Condenser Microphone

GA-47 Large-Diaphragm Tube Condenser Microphone with Multiple Polar Patterns and a 20Hz-20kHz Frequency Response.


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Discounted Price $1,799.00
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The Golden Age Premier GA-47 has been born from a lot of hard work and real-world testing. The end result is a microphone with a very sweet character that should appeal to a great number of users and a microphone that can be used for the most demanding recording tasks. It has proved itself to be a great allrounder, this is not a "vocal-only" microphone.

Mic body and grille
The mic body is made of brass, the grille is made of iron. The grille, which is a critical component affecting the sound character, is similar to the one in the U47.

The capsule for the GA-47 is designed to provide the requirements of modern-day recordings by mixing the character between a vintage K47 capsule and the one from a K67-style capsule with a wide frequency response and high sensitivity. The result is a truly great sound. Being a dual-sided one, it provides the GA-47 with both cardioid and omni polar patterns. In order to get a good consistency between units, for each production run of 50 pcs GA-47 units, approximately 200 capsules is evaluated in order to find 50 capsules with specifications that lie within the tight tolerances.

The GA-47 uses a NOS Telefunken 800 series super low noise pentode tube connected in triode mode in order to decrease distortion and noise. This tube is modern glass derivative of the VF14M used in the vintage U-47.

Output Transformer
The GA-47 transformer is specially designed with a 6.5:1 dual bobbin transformer by a reputed transformer factory. It is a replica of the BV8 transformer used in the vintage U47. It uses a high-quality core material.

Capacitors and Resistors
The coupling capacitor is made in the United Kingdom, the brand is Ciarit, the same type used in the famous and very expensive B&W Nautilus loudspeaker. It is an axial capacitor made from MKP material with copper pins. It has a delicate, full sound and a wide frequency response. Other used capacitors are MIAL polystyrene film capacitors with a very low loss. The resistors are ALLEN BRADLEY carbon film resistors made in the USA with vintage and warm sound.

Mic Interior and Cabling
The electronic circuit is mainly built with point-to-point wiring and the ground connections are tied together using an insulated soldering. Teflon insulated; a silver-plated copper wire is used for the internal connections.

Power Supply Transformer and Electrolytic Capacitors
The vintage style power supply PSU uses a high-power R-style transformer with a low noise level and a minimal stray field. The electrolytic capacitors are of a high-quality audio style type. A simple but effective circuit uses dual-stage filtering for the filament voltage. The high voltage is precisely filtered and stabilized using an ON-semiconductor Zener diode.

Mic Cable
The cable is specially produced using 99,99% pure oxygen-free copper, Teflon insulation, tin foil and 98% kitmeshie with a very high braided density of the cable shield. It has a very open and smooth sound. The connectors are gold plated.

Mic and PSU circuit in relation to the original mics
The circuit used in the GA-47 is similar to the U-47 but the component values have been adjusted to fit the EF800 tube. In order to achieve the best sound quality, no coupling capacitor is used between the capsule and the tube, just like in the classic U-47 microphone. Even the highest quality capacitor will affect the sound. The small price to pay is that it's then not possible to achieve a Figure-8 polar pattern. For users who would prefer to accept that sound quality degradation, the GA-47 can be modified to have a Cardioid and Figure-8 pattern. The polar pattern switch is located on the power supply allowing for easy sound comparisons. The circuit used for the power supply is also similar except for adding a Zener diode to assure the voltage and current stable. The connectors are gold plated. All three connectors are placed on one side to facilitate handling and placement.


  • High-End, no compromise components, and build quality
  • Hand Made in small series, 50 units at a time
  • Capsules selected with very tight tolerances
  • Point-to-point wiring with silver-plated wires, no printed circuit board used
  • All soldering points made with Mudorf Msolder Supreme SilverGold solder (Sn88, 6Cu, 1,8Ag, 9,5Au)
  • Solid wood microphone box, tweed style system flight case. Every mic, box, and PSU has a badge with the serial number
  • Includes power supply, microphone cable, shockmount, and storage/carrying case

Get your Golden Age Project GA-47 Large-Diaphragm Tube Condenser Microphone today at the guaranteed lowest price from Sam Ash with our 45-day return and 60-day price protection policy.

Things You Will Get:

  • Large-Diaphragm Tube Condenser Microphone
  • Power Supply
  • Microphone Cable
  • Shock Mount
  • Storage/Carrying Case


by PowerReviews
Microphone Type Tube
Polar Pattern Multi-Pattern
Capsule/Diaphragm Size 35mm diameter
Frequency Response 20Hz-20kHz
Self Noise 10dB
Output Impedence 200 ohms
Pad No
Low Cut Filter No
Capsule Material Brass
Body Material Metal
Body Color Silver
Power Requirements Power Supply Included
Series GA Series
Model GA47
Warranty Info:

One Year parts and labor warranty

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