THERMIONIC CULTURE THE PULLET mini passive equaliser OPERATING MANUAL
CONTENTS Section Page 1 Introduction 2 2 Connecting the Pullet 3 3 The Pre-amp 4 4 Controls 5 4.1 Mid lift 5 4.2 Mid Cut 5 4.3 High Top 5 4.
1 Introduction The Pullet is a two channel passive equaliser which has no active electronic components included in its design. This means that when using the Pullet it is necessary to use a pre-amp in order to provide the make up gain required. The Pullet has been designed with the Earlybird pre-amp in mind but although it is optimised for use with the Earlybird, care has been taken to ensure that the Pullet will give excellent results when used with any suitable pre-amp available.
2 Connecting the Pullet The Pullet is designed to work at line level (+4dBm) input. Standard 3pin XLR sockets are provided (pin 2 hot). The output is 38 dB lower and has an output impedance of 1.3kΩ (max). The Pullet output should not be routed through a patch bay, short balanced leads are recommended for the Pullet output to pre-amp input connection. Suitable leads are available from Thermionic Culture for connecting to balanced inputs.
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.
4 Controls 4.1 Mid Lift The amount of mid lift is continuously variable between 0 and 21 dB. The actual amount of gain is dependant on the Q setting, so at a narrow Q, 21dB can be added at the centre frequency but at a wide Q, this will drop to around 16dB. f (kHz) This control will select the centre frequency of the mid boost circuit. Q This control sets the width of the frequency band being boosted.
‘∞’ means that in this position there is no high top Eq being used. 4.4 Bypass This control allows the Eq circuit to be completely bypassed, although the input transformer is still left in circuit to help with balancing issues. There are two pre-set pots situated inside the Pullet that can be adjusted to alter the level of the bypass signal. These are factory set so that when used with the Earlybird, or fed from an impedance of much more than 600Ω, the Pullet gives unity gain when bypassed.
5 Specifications Output impedance 1.3kΩ Input impedance 15kΩ Maximum Mid Lift Maximum Mid Cut Max High Top Lift Max High Top Cut Frequency response with no Eq ±0.3dB Input and Output connectors 21dB -17dB 6dB -9dB 17Hz to 50kHz © Thermionic Culture Ltd, April 2006 (with Pullet eq. in and set flat, ie.
Pullet frequency response curves 25 0.8k Hi Q 1.2k Hi Q 1.6k Hi Q 2k Hi Q 2.5k Hi Q 3k Hi Q 20 15 10 3.5k Hi Q 4.4k Hi Q 5k Hi Q 1.2k Lo Q 3k Lo Q 6.3k Lo Q 6.3k Hi Q 8.3k Hi Q 10k air lift 12k air lift 15k air lift Gain(dB) 5 0 10 -5 -10 -15 -20 0.34k cut 0.5k cut 0.7k cut 1k cut 1.4k cut 2k cut 2.
Thermionic Culture Ltd., Harlow, Essex, UK Tel: +44 (0)1279 414770 Fax: +44 (0)1279 412233 © Thermionic Culture Ltd, April 2006. Printed in UK.
