Phono 1:1 Input Transformers - info sought...

Okay, so this normally in phono stages to modify the signals, they just called it out as being special...

Most likely they are using input transformers to create a balanced input from what is internally a single ended circuit.

I would agree with lewm. Believe they are using the transformer to convert to a balance signal which would help to reduce noise on long cable runs or provide a balanced input to your preamplifier if that is all your preamp has. I have not looked at the Brinkmann link you provided. What control preamp are you using?

The 1:1 input transformers might also be used to invert phase at the input of the phono stage. (I notice that the ad copy mentions phase inversion as a feature.) Actually, by using the transformer input, you can do both: convert an SE input to balanced and add a phase inversion function. If the transformers are indeed at the inputs of this phono stage, there would be no effect on the output of the phono stage, but the unit does seem to claim a balanced output.

Thank you for your replies, This unit allows the user to turn it on/off.. maybe it is for noise and long runs. I will send them an email and inquire,

Steve

Some of whats discussed above is for balanced output transformers. A phono cartridge is a balanced source provided wiring allows. Sounds to me like the input transformer is used to provide isolation ?

You’re correct about cartridges but most have cartridges wired single ended at the phono stage. I puzzled over this myself. In certain circuits there can be DC offset at the input stage. Resulting DC current across the coils of an LOMC cartridge could damage it. The transformer would protect the cartridge from DC. Ask Brinkmann.

A SUT can he wired as 'balanced' input with transformer ground floated...1:1 could too.