Thermionic Culture THE PULLET Mini Passive stereo equaliser - Manual (Page 5)

© Thermionic Culture Ltd, April 2006 4
3 The Pre-amp
The pre-amp that is used will need to give approximately 40dB
of gain to the signal after it has been passed through the Pullet
and ideally the pre-amp will have an input impedance of 1200Ω.
This will allow the signal to be kept at unity gain when the Pullet
is either in bypass or when there is no equalisation being used.
The Pullet should always be placed before the pre-amp in the
signal path ie. Signal goes into the Pullet then out of the Pullet
into the pre-amp.
There are situations in which the 40dB of gain can be reduced.
For example, a high level signal which is having 21dB of mid-
boost applied to it. In these situations the amount of gain can be
altered according to the user’s taste.
The advantages of using the Earlybird as a pre-amp with the
Pullet are that, apart from extremely low noise and high
undistorted output levels, it provides the optimum input
impedance as well as having active Eq built in. This gives
control over bass frequencies and added flexibility over mid
range and high frequencies.
It is very important to note that any pre-amp with a 48V supply
for condenser microphones should have the 48V supply
switched off. We have taken care to upgrade the necessary
components to ensure that no damage is done to the Pullet if
48V is accidentally left on for a short time.