[GreenKeys] Basic question

[Dave, KV4CN]

Happy New Year everyone.
I'm assembling my first mechanical RTTY station.  Just got a model 28ASR and will use with an ST-6.  The ST-6 loop voltage is 175 volts.  What I have seen in the literature is a range of 120 to 150 volts.  Is 175 too much for the M28?
Thanks and 73,
Dave KV4CN
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