Thermionic Culture Ltd, October 2019
3
1
Introduction
The Snow Petrel is designed as a two channel microphone
amplifier for all types of microphones, especially certain ribbons,
eg. Coles 4038, which have a lower output level than others but
offer superb quality. Their full potential can be realised with this
high gain unit as it has a natural valve sound with very low
background noise and distortion. The passive “AIR” control is
provided to lift the very high frequencies as many ribbons suffer
a little loss there and this compensates for that perfectly.
It will give excellent results with any microphone and we have
in48V phantom power and -20dB pad for use with FET
and self-amplifying microphones.
There are 3 valves in each channel of the Snow Petrel, the first 2
acting as the main amplifier preceded by a specially designed
Sowter input transformer, then after the passive HPF and Air
controls comes the Tung Sol (6189) output valve and Sowter 1:1
transformer. This combination is capable of a clean output in
excess of +25dBu. Of course many users may want valve and
transformer colouration to give a bit more “edge” to the sound so
we have provided 2 attenuators, O/P trim comes after the 1
st
2
valves and can be used to provide a little 2
nd
harmonic
colouration, then the “ATTEN” is at the actual output so if the unit
is driven hard it will add transformer as well as valve distortion.
Summary of Contents for Snow Petrel
Page 1: ......
