100V LINE TRANSFORMERS

FEATURES Custom design service ensures optimum design without the use of taps which can degrade performance. Highest grade grain-oriented low loss laminated cores (M6)for minimal distortion. Highly sectionised interleaved primary/secondary windings to ensure the best possible high frequency and transient response Low insertion loss. Windings protected by end shields. Termination is by 12 inch colour coded leads. Amplifier impedance (4 or 8 Ohms etc) or different line voltages to your requirement. Auto wound, tapped and multi winding transformers available. Just ask for a quote.

		SIZE INFORMATION FOR 100 V LINE TRANSFORMERS
Maximum POWER at lowest frequency (W)				Dimensions (mm)			Shipping  Weight (Kg)	SIZE CODE
Music (40Hz)	Type #	Speech (60Hz)	Type#
				x	y	z
10	9528	20	9528	66	58	48	0.9	SC
60	LM06	90	LS09	79	72	88	1.5	SI
75	LM08	115	LS12	88	72	88	1.7	SJ
120	LM12	200	LS20	86	96	117	2.6	SL
180	LM18	300	LS30	98	96	117	3.4	SM
250	LM25	380	LS38	110	96	117	4.6	SN
350	LM35	550	LS55	135	96	117	6.4	SP
650	LM65	900	LS90	150	112	135	9.4	SQ

Both Music and Speech types are designed to have excellent bandwidth and transient response the only difference being the frequency at which the maximum power can be handled without significant distortion. To order please state power and nominal impedance of driving amplifier. The table shows the size as a function of power rating. Please call for help with specification if necessary.

NOTES ON SPECIFYING LINE TRANSFORMERS

1: The power required by the maximum number of speakers connected to the amplifier.  It makes no difference to the transformer how many speakers are actually connected.  If the load used is less than the maximum, the current drawn from the amplifier is reduced but the voltage delivered from the transformer remains at 100V.

2: The nominal impedance at which the amplifier is designed to deliver this maximum power.  If you get this wrong the amplifier will trip because of be over voltage or over current.

3: The lowest frequency at which it is required to deliver the maximum power.  If you get this wrong the transformer will saturate and cause distortion.  Frequencies below the specified value must be filtered at -6 dB per octave.

4: If the speakers have taps for volume adjustment this makes no difference to the amplifier or transformer.  You simply use the proposed power setting of each speaker to arrive at  the maximum power.  Normally the maximum to allow flexibility.

MULTI WINDING TRANSFORMERS We make several types of multi winding transformer to distribute varying levels to individual loudspeakers for Line Source loudspeakers etc.

TAPPED TRANSFORMERS FOR LEVEL ADJUSTMENT Non-isolating (auto-wound) operating at the line level (100V or customer choice). Input and output taps may be used to provide course and fine adjustment eg: Input tap 0 or -2.5 dB and output taps in 5 dB steps giving 0 dB to -40 dB in 2.5 dB steps.

TAPPED LINE RECEIVER TRANSFORMERS for level adjustment at loudspeaker end. Various designs are available for speech and high quality music use.

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