Thermionic Culture THE EARLYBIRD 2.2 2 Channel mic, pre amp with eq - Manual (Page 4)

©Thermionic Culture Ltd., September 2010 3
1 Introduction
The Earlybird 2.2 is a two channel all valve pre-amp
employing a balanced push-pull circuit, which as far as we
know, is unique in this application. The use of this type of
circuit gives very low noise and plenty of headroom with
minimal distortion. These factors coupled with a switchable
input impedance will mean the user can get a very natural
interpretation of whatever sound the microphone is picking
up, whether the mic is valve, ribbon, moving coil or FET.
After much dedicated development work in conjunction with
Brian Sowter, we have arrived at the pinnacle of audio
transformer design. Both the input and output transformers
have been optimized for use in our unique circuit. This
results in more headroom and lower distortion especially at
low frequencies.
The Earlybird 2.2 need not stand idle once the mixing
process has begun. The line input facility means that the
sonic characteristics and EQ facilities of the Earlybird 2.2
can be fully utilised on any mono or stereo signals that the
user feels may benefit from such enhancement. With this in
mind the Pullet acts as a perfect companion for precision mid
range EQ.
We believe that the Earlybird 2.2 is not only the finest mic-
amp available for today's recording environment but
combined with its EQ and Pullet compatibility, the most
versatile.