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SKU

148085

Golden Age Project GA-8000 Tube Condenser Microphone

Tube condenser microphone equipped featuring very high-quality performance and modern sound character plus a semiconductor active cooling system that results in a higher signal-to-noise ratio compared to most other tube microphones

MFR# GA-8000

Product Description

The Golden Age Project GA-8000 is a tube condenser microphone equipped with a semiconductor active cooling system that results in a higher signal-to-noise ratio compared to most other tube microphones. It has a very high-quality performance and modern sound character.

The GA-8000 uses a ROGERS ceramic circuit board that has superior insulation parameters and offers a more stable performance. The coupling and bypass capacitors are very high quality, resulting in a deep and exact low-frequency performance and a delicate and transparent high-frequency reproduction.

The semiconductor active cooling and external cooling system used in the GA-8000 ensures that the GA-8000 has the highest possible signal-to-noise ratio. The tube (a 6AU6) is mounted in an aluminum casing, with the semiconductor cooling chip being attached to the bottom of the case.

The temperature of the tube in the GA-8000 is effectively kept down when the GA-8000 is in it's working state, the heat generated by the tube is actively dissipated. The heat that the tube generates is transferred to the reverse side of the semiconductor and transferred to the effective outer aluminum alloy heat sink at the rear of the microphone. This heat sink will then dissipate the heat from the semiconductor cooling chip to the air surrounding the GA-8000.

PCB board

A ROGERS ceramic gold-plated circuit board is used. This type of circuit board is usually used in high-end aerospace communication products, the cost is about twenty (20!) times higher than an ordinary PCB board.

Capsule

A manufacturer with more than twenty years of microphone capsule production experience is producing a capsule that has a modern sound character. The capsule used in the GA-8000 can handle a high sound pressure level.

Tube

In order to ensure the tube will have a long life, we are using a NOS CIFTE 6AU6 tube from France, it has a maximum anode voltage rating of about 300V. The tube in this circuit has an anode voltage of 90V and will generate more heat than tubes in many other tube microphones that typically use voltages between 35-50V. The higher voltage used in the GA-8000 increases the heat dissipation so the semiconductor active cooling system is an important element in the design.

Power supply

The GA-8000 uses a modern power supply with solid-state rectifiers and a FET based stabilization circuit for the high voltage rail. After a lot of listening tests comparing a tube rectifying circuit with a solid-state one, we found that we did prefer the sound of the latter so this is what we decided to use. The additional advantage is that there is no need to worry about replacing tubes in the power supply.

Capacitors, resistors and solder

The metal resistors and electrolytic capacitor from Japan are of special audiophile audio types. The coupling capacitors are Siemens EPCOS from Germany. The connecting wires inside the GA-8000 are oxygen-free copper wires from Japan. The solder is FELDER silver/copper-containing solder from Germany.

Product Specifications

ConditionNew
Package ContentsGA-8000 microphone, Rycote USM-VB shock-mount, and power supply
Tube or Solid StateTube
Tube Type6AU6
Transducer TypeCondenser
Polar PatternCardioid, Omni-Directional
Number of MicrophonesSingle Microphone
Frequency Range20 Hz - 20 kHz
Sensitivity-33 dBV/Pa (22.4 mV)
Max. SPL137 dB (cardioid); 140 dB (omnidirectional)

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