Thermionic Culture THE EARLYBIRD 4 4 Channel mic. Pre amp - Manual (Page 8)

©Thermionic Culture Ltd., July 2014 7
4 Operational Suggestions
For most microphones 300Ω will give best results. 1200Ω is
recommended by Neumann for FET mics (though we like the
sound of the U67 on 300Ω). 1200Ω is good for SM58s. For
high level inputs, eg. kick drum, use the Pad to reduce level.
With Pad in the input, Z will be 2kΩ.
Keep Output Level controls near maximum for cleanest
results, low and increase Gain control if a bit of distortion is
what you want. 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.