Thermionic Culture Snow Petrel Operating Manual Download Page 10

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Thermionic Culture Ltd, October 2019

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
table: -

Operating Voltage

Fuse Rating

115V
230V

T630mA
T315mA

Summary of Contents for Snow Petrel

Page 1: ......

Page 2: ...n remain charged even after the mains supply has been disconnected It is essential that these capacitors are discharged after the mains supply has been disconnected and the covers have been removed In...

Page 3: ...1 Introduction 3 2 Installation 4 3 Controls 5 3 1 Pad 5 3 2 Input Z 5 3 3 Gain 5 3 4 HPF 5 3 5 Air 5 3 6 O P Trim 5 3 7 Atten 6 3 8 Phantom Power 6 4 Operational Hints 7 5 Servicing Maintenance 8 5...

Page 4: ...microphone and we have included 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 amp...

Page 5: ...igned 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 However if it is mounted with the face plate hori...

Page 6: ...Lo a low impedance source is used and the output feeds a 10k load with no attenuation If input Z is set to Hi there will be a reduction in gain of around 6dB depending on the microphone impedance 3 4...

Page 7: ...mer and will attenuate the signal by 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 pull...

Page 8: ...endary engineer Geoff Emerick of Abbey Road boosted a pair of 4038s by 6 dB 12 kHz on The Beatles drum overheads and this can be replicated and bettered with the Air control As for legendary engineers...

Page 9: ...1 channel only valves can be swapped in turn to isolate the fault Try the output valves first then work back to the inputs smaller ones in cans Switch OFF when changing valves WARNING Very high volta...

Page 10: ...etrel 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 w...

Page 11: ...54dB Gain 68dB Gain Max Gain 0 012 0 025 0 1 0 2 Crosstalk most settings and frequencies Better than 60dB Signal to Noise most settings Better than 100dB NB The above figures are typical and may vary...

Page 12: ...10 8 6 4 2 0 2 4 6 8 10 10 100 1000 10000 Gain dB Frequency Hz The Snow Petrel Frequency Response Air High Pass Filter Air Half Air Max HPF 60Hz HPF 120Hz HPF 240Hz HPF Flat...

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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