Related Manuals for Thermionic Culture The Earlybird 4
Summary of Contents for Thermionic Culture The Earlybird 4
- Page 1 HERMIONIC ULTURE TheEarlybird 4 valve microphone pre-amplifier OPERATING MANUAL...
- Page 2 Please ensure that adequate ventilation is provided and that the ventilation slots are not obstructed. When rack mounting this equipment, a fan may be required to provide sufficient airflow. ©Thermionic Culture Ltd., July 2014...
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Page 3: Table Of Contents
CONTENTS Section Page Introduction Controls Gain Bass filter +48V Phase reverse Output trim Metering Operational suggestions Specification ©Thermionic Culture Ltd., July 2014... -
Page 4: Introduction
FET. The Earlybird 4 mic amps are improved versions of the Earlybird 1 and 2 series. They have improved Sowter input and output transformers and traditional point-to-point hand wiring by experts, eliminating the (slight) performance degradation occurring when using circuit boards. -
Page 5: Controls
Phase reverse These switches will invert the phase of the signal.in the corresponding channel, when in. Output trim These controls reverse linear attenuators, operating after the electronics. The full output of the ©Thermionic Culture Ltd., July 2014... - Page 6 These controls are designed to be both ‘fine’ level controls and to reduce the output to feed -10dBV systems. ©Thermionic Culture Ltd., July 2014...
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Page 7: Metering
Output Trim is set to the ‘M’ position (with a load impedance of 10kΩ). NOTE:- 0 VU is set to the original British standard of +8 dBm rather than the usual US standard or +4 dBm. ©Thermionic Culture Ltd., July 2014... -
Page 8: Operational Suggestions
The electronics have plenty of headroom for most purposes, so don’t worry too much if the needle of the meter hits the end stop. High gain settings make the sound more ‘gritty’ than lower ones, which are very smooth. ©Thermionic Culture Ltd., July 2014... -
Page 9: Specification
4x6189/ECC82 12V/3W Pilot light bulb 115V: T1 A Fuses 230V: T500mA Typical frequency response 40dB 45dB 50dB 55dB 60dB LF (Hz) HF (kHz) Less than 1dB variation between the ‘LF’ and ‘HF’ frequencies shown above. ©Thermionic Culture Ltd., July 2014... - Page 10 Noise (dB ref. MOL) Phase shift (°) @ 0 (0%) 0 (0%) 3 (0.8%) 100Hz 1 (0.3%) 2 (0.6%) 1kHz 14 (3.9%) (0.4%) 31 (8.6% 10kHz 28 (7.8%) 17 (4.7) 62 (17%) 20kHz 35 (10%) ©Thermionic Culture Ltd., July 2014...
- Page 11 Thermionic Culture Ltd., Harlow, Essex, UK Tel: +44 (0)1279 414770 email: technical@thermionicculture.com ©Thermionic Culture Ltd., July 2014. Printed in UK.
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