Deutsche VersionThe equalizer amplifier consists of 3 printed circuit boards:
Amplifier supply board 7 950 037
Equalizer amplifier 7 950 038 or 7 950 088
Line amplifier 7 950 039
The version of the equalizer amplifier (038 or 088) depends on the pick-up to be used:
7 950 038 to be used with MC pick-up's (e.g. EMT T-series)
7 950 088 to be used with MM pick-up's
7 950 038
This version is equipped with two input transformers 4 150 056 (1:7) to be used with MC pick-up's (EMT T-series). R750 and R750' have a value of 12 kOhms.
To be used with pick-up's of the EMT O-series, it is recommended, that the transformers are replaced with 4 150 059 (1:1.3).
Modifying into version 7 950 088 means to replace the transformers with wire bridges and to exchange R750 and R750' against 68 kOhms.
7 950 088
This version uses no transformers. It's input impedance is 47 kOhms. It is to be used with MM pick-up's. R750 and R750' have a value of 68 kOhms.
Modifying into version 7 950 038 means to replace the wire bridges at the input with transformers 4 150 056 (for EMT T-series pick-up's) or 4 150 059 (for EMT O-series pick-up's) and to exchange R750 and R750' against 12 kOhms.
If one owns several equalizer amplifiers, there is nothing more to be done, than pull out the one, which is not needed and plug in the desired one. No electrical
adjustment is necessary. But depending on the used pick-up, the tone arm balance has to be re-adjusted.