Transformers used in Rolls PM 351

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mhmhmh

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Joined 2016
Hi there,

my plan is to build a clone of the personal monitor mixer Rolls PM 351. The schematic can be found here. Everything seems to be well documented apart from the ratio of the audio transformers T1 und T2 (located in the kind of DI-circuit of the instrument channel). Should they be simple 1:1 decoupling transformers or more like the ones used in DI units with a 10:1 (or similiar) ratio:confused:? And if X is the perfect ratio - whats the math behind it? Can anyone recommend a specific brand/transformer to be used in this scenario?

Thanks in advance,
mhmhmh
 
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