PHONO CARTRIDGE TRANSFORMERS

We offer a range of cartridge transformers suitable for most cartridge impedances and a choice of ratio. Multi- section winding techniques are used to maximize bandwidth and transient response. All our cartridge transformers are constructed on Mumetal (76% Nickel) cores for minimal distortion and contained in heavy gauge Mumetal screening cans. Multiple internal electrostatic shields are provided to minimize noise pick-up. The "Studio" type (8055) has an excellent bandwidth and is fully balanced for the ultimate in noise rejection. This type is recommended for Ortofon MC cartridges. Connection is by colour coded flying leads (6 inches long). Octal base available for small extra charge.

CHOICE OF TRANSFORMER  The first step is to determine the actual impedance (resistance) of the cartridge.  As a guide if this is less than 25 ohms then choose from the Low impedance row below.  If it is above 25 ohms then choose from the High impedance row.  It is important that the cartridge "sees" an impedance at least 10 times the actual cartridge impedance.  All the transformers below will ensure this if the input impedance to the amplifier is high (normally not a problem) and the correct type is chosen.  Next choose the ratio.  It is best to use 1:10 if you have enough output from the cartridge and gain in the amplifier.  The higher ratios are for use when gain or output is limited.

TWO TRANSFORMERS are required for a stereo system.

CARTRIDGE TRANSFORMERS
TYPE Application Ratio Cartridge Z (ohms) Bandwidth +/- 0.5 dB

(nominal Z)

 Can dia (mm) Can hight (mm)
9570 Low impedance 1:10 8 (3-100) 5Hz-100KHz 34 34
9990 1:20 8 (3-10) 5Hz-100KHz 34 34
9580 High Impedance 1:12.5 40 (25-100) 10Hz-100KHz 34 34
8055 Studio 1:10 3 (3-15) 5Hz-100KHZ 34 37.5