Deutsche Version
The usage of different EMT pick-up's
There are EMT pick-up's for different applications. They differ in such data like diameter of the stylus, tracking force and impedance. Please find below some hints about the operating conditions of the single types and find here parameters of some old records:
T-Series
The T-series transducer is constructed in a way, that it is possible to read horizontal as well as vertical tracks. The mono versions TMD and TND are built with only one coil which is connected only to the right channel output (the horizontal pins) by historical reasons. Caused by the construction, vertical trackings, like bending of the record or dust will be read as well.
The tracking force is 2,5p
Transducing factors:
TSD 15: 2 x 0,21 mV*sec/cm / The output voltage is about 1 mV
TMD 25: 1 x 0,21 mV*sec/cm
TND 65: 1 x 0,21 mV*sec/cm
OF-Series
The OF-series pick-up's are pure mono versions. The transducer is constructed in a way to read only horizontal trackings. The coil is connected to the right channel (the horizontal pins).
"x" means "D" when equipped with a diamond and "S" when equipped with a sapphire.
The tracking force for OFx 25 is 5p, for OFx 65 9p. For both versions the special mono counterweight (7 929 021) is needed. The weight of OFx 65 is always 4p higher than OFx 25.
The output voltage is about 10 mV
OFx 25 1,15 mV*s/cm
OFx 65 0,85 mV*s/cm
Connection to the several EMT equalizer amplifiers
- EMT 927: see EMT 930
- EMT 928: The input sensitivity can be changed between 1 mV and 10 mV by equipping the equalizer amplifier with or without an input transformer.
- EMT 930: The tube amplifiers had a fixed input sensitivity of 10 mV (mono) and 1 mV (stereo). The transistorized EMT 155 can be used for magnetic pick-up's without input transformer (10 mV and high impedance). When used with input transformer for EMT pick-up's, a bridge behind the transformer can be connected between "c" and "d" for T-series pick-up's or between "c" and "e" for O-series pick-up's. The EMT 153 (equipped with ICs) has a sensitivity of 1 mV (with transformer) and of 10 mV (without transformer).
- EMT 938: Using the machine with the prepre amplifier 7 938 023 sets the input sensitivity to 1 mV. Connecting the tone arm cable directly to the equalizer amplifier sets the sensitivity to 10 mV.
- EMT 948: The input sensitivity can be changed between 1 mV and 10 mV by equipping the equalizer amplifier with or without an input transformer (changes also between low and high impedance). 1 mV for EMT-T-series pick-up's and 10 mV for moving magnet pick-up's. If used in conjunction with O-series pick-up's, it is recommended to replace the standard transformer 4 150 056 (1:7) by the transformer 4 150 059 (1:1.3). See also Equalizer amplifier EMT 948/950.
- EMT 950: see EMT 948