Golden Age Project FC 3
Multi-Pattern Condenser Microphone
The FC 3 is a side-address, 3-pattern FET condenser with a transformer-coupled output circuit.
Although previously reported here (based on statements from GAP) to use a 34mm, 3-micron capsule, the sample FC3 microphone we purchased contained a 32mm capsule. This capsule almost certainly has a 6-micron diaphragm. It is a center-terminated K67 type.
Three switches on the mic body enable pattern selection (Cardioid, Omni, Figure-8), a switchable pad (-10dB), and a switchable high-pass filter (cutoff at ~80Hz).
The circuit is a two-stage transistor design, with an emitter follower driving a low-ratio output transformer. This circuit is linear — it does not apply any frequency-dependent corrective filtering to the capsule’s signal, unless the high-pass filter is engaged.
The DC circuit board contains a voltage multiplier that is capable of polarizing the capsule at +60VDC. Individual samples we’ve seen vary from 50–63VDC. Note that in Figure-8, the rear diaphragm is at double this voltage (+120V), while the backplate is at +60.
The FC3 is nearly identical to the CAD GXL3000, although the GXL3000 comes with a higher-quality, larger capsule (35mm O.D., 6 micron diaphragms).
The Golden Age Project FC 3 is also known as: FC 3.
|Pickup Patterns||Pads & Filters|
(14.5 mV/Pa; 20 - 20,000 Hz)
Cardioid (14.5 mV/Pa; 20 - 20,000 Hz)
Bidirectional (14.5 mV/Pa; 20 - 20,000 Hz)
| Diaphragm diameter: 25mm
Capsule diameter: 32mm
Diaphragm gauge: 6 microns
|250 Ohms (Low)||Max SPL: 140 dB
Self-noise: 17.0 dB(A)
|470g (16.58oz)||190mm (7.48'')||50mm (1.97'')||
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