PACKAGE PART NUMBER

SOWTER TYPE 9111

HIGH PERFORMANCE 600 OHM LINE TRANSFORMER WITH FULL GEOMETRIC BALANCE

Mumetal can 9111
APPLICATION Designed for use in the Raven pre amp.  Exceptionally high level, high bandwidth, low distortion 600 ohm input transformer. Suitable as replacement for original transformer in many vintage recording studio units. 100% geometric balance ensures near perfect phase splitting for use with balanced amplifiers.  For use in a parafeed configuration as shown in the Raven circuit.  No uncancelled dc permitted in primary or secondary windings. 
FEATURES Unusually large combination Mumetal/M6 core for minimal harmonic distortion and high level capability.  The Mumetal part of the core also ensures excellent dynamic range, bandwidth and transient response. Two chamber bobbin provides full geometric balance for the ultimate in noise rejection and phase splitting performance. The secondary windings may be used in a series/parallel configuration for increased ratio  which will result in a lower output impedance and reduced output level. Heavy Mumetal screening can to ensure immunity from hum fields. 
Configuration 6.4 : 1 3.2 : 1 1.6 : 1
Secondary connection All windings in parallel (1 and 2 series)
 in parallel with 
(3 and 4 in series)
All windings in series
Bandwidth (-3 dB points, typical) 5 Hz to 70 kHz 5 Hz to 90 kHz 5 Hz to 110 kHz
Total DC resistance ref. primary (typical) 110 ohms 110 ohms 110 ohms
Max. output level at 50 Hz +20 dBu +26 dBu +32 dBu
Total harmonic distortion 0.002% at 1kHz 0.002% at 1kHz 0.002% at 1kHz
Diensions 72 mm x 55 mm x 45 mm high
FREQUENCY RESPONSE 
measured using 4k1 ohm source 
and 60
0 ohm load

E A Sowter Ltd, The Boatyard
Cullingham Road
IPSWICH IP1 2EG England
Tel: +44(0)1473 252794
Fax: +44(0)1473 236188
E-Mail sales@sowter.co.uk