Golden Age GA-251 MKII Tube Microphone
Price$1,999
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from Irmo, SC
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Irmo, SC, United States
14-Day Return Policy
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The MKII version has the following improvements:
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 ELA M 251.
Capsule
The
GA-251 MKII uses a 34 mm K251 style capsule. Being a dual-sided one, it
provides both cardioid and omni polar patterns. In order to get a good
consistency between units, for each production run of 50 pcs GA-251 MKII
units, approximately 200 capsules is evaluated in order to find 50
capsules with specifications that lie within the tight tolerances.
Tube
The
GA-251 MKII uses a NOS Phillip 5840W super low noise pentode tube
connected in triode mode in order to decrease the noise. The GA-251 MKII
amplifier features a new proprietary circuit designed around the NOS
5840W tube.
Output transformer
The GA-251
MKII transformer is specially designed with a 10:1 AMI style dual bobbin
transformer. It is made from permalloy steel sheet from USA and
enamelled wire from Germany. It offers a wonderful sound character with a
high resolution and great balance between the low, middle and high
frequency bands.
Capacitors and resistors
The
coupling capacitor is made by Solen from France. It is a high balanced
film capacitor made from MKP material with pure oxygen-free copper
connections. It has a very delicate and balanced sound. The capsule
capacitor uses NOS Siemens antique grade polystyrene capacitor to reduce
loss. The tube cathode bypass capacitor uses an ELNA OFC Cerafine high
end hifi capacitor from Japan with oxygen free copper connections
exhibiting a very sweet and delicate character, not the least for
vocals. The other capacitors are of the low loss polystyrene type. The
resistor used for setting the capsule voltage is a high quality DALE 1%
metal film resistor. The result is a very stable and consistent
operating level leading to better consistency between different GA-251
MKII units. The plate resistor uses a non-inductive resistor of the
United States IRC audio with pure copper connections. The sound level is
rich and full bodied.
Mic interior
The
electronic circuit is built with point-to point wiring, All soldering
points made with Mudorf Msolder Supreme silver gold solder All of the
inside wire use pure silver wire and decrease the loss during the
circuit transmission, also it can ensure the sound quality is
transparent. All components which are connected to electrical ground is
connected to the ground plane on the circuit board. All other component
connections use point to point wiring which results in virtually zero
loss and crosstalk.
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 minimum stray field. A simple but effective
circuit uses dual-stage filtering for the filament voltage. The High
voltage is also precisely filtered and stabilized using an ON
semiconductor zener diode. The polar pattern switch is placed on the
power supply so that the recording engineer can change the polar pattern
between Cardioid and Omni remotely. A ground lift switch will help to
solve mains power related noise issues that can appear in some cases
Mic cable
The
cable is specially produced using 99,99% pure oxygen-free copper,
Teflon insulation, tin foil and 98% kitmesh, ie with a very high braided
density of the cable shield. It has a very open and smooth sound. The
mic connector is an aviation style plug providing solid connections and a
long life.
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