Thermionic Culture THE EARLYBIRD 4 4 Channel mic. Pre amp - Manual (Page 9)

©Thermionic Culture Ltd., July 2014 8
5 Specification
Included are the figures for noise, distortion and EQ. They
are all measured with the Earlybird set up for 44dB mic gain /
0 dB line gain and a 10kΩ load.
Input impedance
With Pad in:
300Ω or 1200Ω, switchable,
balanced
2kΩ
Output impedance
(a) Output level control at max
(b) Output level control at min
55Ω balanced
500Ω balanced
Maximum gain
62-64dB
Maximum output level (MOL)
+34dBm
Distortion (THD)
@
1kHz/100Hz, unweighted, at 40dB
gain
0.0035% / 0.008%
Frequency response
±0.5dB at 40dB gain setting
>10Hz to<35kHz
Gain settings
(dB)
Mic
40, 45, 50, 55 & 60dB
High pass filter
(Hz) 50 & 100Hz
Output trim
-17dB to +2dB reverse linear
attenuator
Input and output connectors
4 x 3 pin XLRs, wired balanced
Valve complement
4x12AX7LPS/ECC803/7025
4x6189/ECC82
Pilot light bulb
12V/3W
Fuses
115V: T1 A
230V: T500mA
Typical frequency response
40dB 45dB 50dB 55dB 60dB
LF (Hz)
3 3 4 5 9
HF (kHz)
58 50 36 23 15
Less than 1dB variation between the ‘LF’ and ‘HF’
frequencies shown above.