Sennheiser mic input trafo TM003 specification needed.thanks

andre tchmil · Aug 2, 2004

got some old input trannie here, cylinder shaped , 2 pairs of wires ( red/ blue , must be output and green/ grey, must be input)
has the sennheiser "s" logo on it and the numbers TM 003, and (I guess the serial number) Bv 1.1 27 9.

anyone can help me out on this

Bo Hansen · Aug 4, 2004

Hi Andre,

The Sennheiser TM-003 is a 1:15 or 1:30 ratio transformer,
(1:30 = half primary winding)
Primary 200 ohm with centre tap: gray - yellow/CT - green
Secondary oprox. 45 k: red - blue (secondary recomend load is 500 kohm)

--Bo

andre tchmil · Aug 6, 2004

thanks for the info Bo.

Can you explain the center tap thing 1:30 or 1:15 ratio.
Mine has only 4 leads, 2 for input and 2 for output.

green/ gray on input , and red /blue on the output.
can I use this trafo on your DIY DI box for instance ?

Sennheiser mic input trafo TM003 specification needed.thanks

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