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Summary of Contents for Thermionic Culture Snow Petrel
- Page 2 It is not advisable to operate this equipment if all valves are not in place and working, as voltages will rise and components may overheat and fail. Thermionic Culture Ltd, October 2019...
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Page 3: Table Of Contents
CONTENTS Section Page Introduction Installation Controls Input Z Gain O/P Trim Atten Phantom Power Operational Hints Servicing & Maintenance Valves Operating Voltages/Fuses Specification Thermionic Culture Ltd, October 2019... -
Page 4: Introduction
+48V 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. -
Page 5: Installation
Ensure that the voltage selector at the rear is correctly set for your mains voltage! The Snow Petrel is designed primarily for vertical rack mounting and there is no need to leave gaps above or below it, as long as there is reasonable ventilation to the rack. -
Page 6: Controls
When set to 10 will give a lift of 5dB at 10kHz, peaking at 22kHz. 3.6 O/P Trim Reduces the output of the input stages by up to10dB. Note: the figures on the front panel do not represent dB reduction except 0 and 10. Thermionic Culture Ltd, October 2019... -
Page 7: Atten
7 or 15dB allowing distortion in the output stage and transformer. Figures are correct with a 10kohm load. 3.8 Phantom Power The 48V enabling switch needs to be pulled out to switch on. Preventing accidental application, protect ribbon microphones, etc. Thermionic Culture Ltd, October 2019... -
Page 8: Operational Hints
As for legendary engineers, Glyn Johns is on record as saying that part of his drum mic-ing technique was to overdrive the mixing console channel. The Snow Petrel will give you this effect by using 2 separate attenuators, one before and one after the Output stage. -
Page 9: Servicing & Maintenance
Before we supply spare valves we test and select them, then “soak” them at high power for 48+ hours, then check them again in a working unit to ensure they are still up to spec before sending to customers. Thermionic Culture Ltd, October 2019... -
Page 10: Operating Voltages/Fuses
5.2 Operating Voltages/Fuse The Snow Petrel can be set to operate from either 230V or 115V 50/60Hz. The approximate voltage can be selected on the red switch located next to the mains inlet. NOTE: Mains fuses must be replaced in accordance with the following... -
Page 11: Specification
For details of how figures are measured, please contact technical@thermionicculture.com I/P & O/P Connectors 4 x XLR, wired balanced. Pin 1 GND Pilot Lamp Bulb 12V 3W Power Consumption NET Weight Thermionic Culture Ltd, October 2019... - Page 12 The Snow Petrel Frequency Response - Air & High Pass Filter 1000 10000 Air Half Air Max HPF 60Hz HPF 120Hz HPF 240Hz HPF Flat Frequency (Hz)
- Page 13 Thermionic Culture Ltd., Harlow, Essex, UK Tel: +44 (0)1279 414770 email: technical@thermionicculture.com Thermionic Culture Ltd, October 2019. Printed in UK.
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