Exceptionally high level, high bandwidth, low distortion 600 ohm or 200 ohm input transformer. Suitable as replacement for original transformer in Trident A range, B range, Fleximix and other vintage recording studio units. No uncancelled dc permitted in primary or secondary windings. Unusually 70% Mumetal/30% M6 laminated core for minimal distortion even at very high levels. Very high inductance ensures an input impedance of at least 1000 Ohms over a wide frequency rqange when the secondary is loaded with 50K Ohms. Heavy Mumetal screening can to ensure immunity from hum fields.