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 600 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