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In Reply to: RE: Cinemag 1254 SUT posted by richardl on February 08, 2025 at 10:11:17
I would ground the low side of the secondary but used two conductor shielded wire from the tonearm. Ground the tonearm and ground the shield at the transformer end but leave the primary winding floating. That way you get common mode rejection of anything picked up in the wire run. Just like a microphone cable.Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 02/08/25Follow Ups:
Hi Tre,
I lashed it up in a Hammond box using full primary x10 gain for a listen.
I followed the cinemag recommendation which has both the primary/secondary floating they extend a black/white wire which goes to faraday ground or chassis/box ground which is where I fixed my TT ground onto and zero hum, very happy.
Connected to AT OC9XSL cart 0.4mV, 12 ohms source and it sounds excellent, plenty of meat on the bones, I prefer it to the Lundahl LL1931 which is no slouch either.
Cheers Johno
It's great that you had good results but using two conductor shielded wire is important.
With two conductor shielded wire and hum that reaches the two conductors does so evenly and that makes the rejection deeper. Using normal single conductor wire means the shield get more hum than the inside conductor and the CCR (common mode rejection) will not be as complete.
To me the key to the hook up is the two conductor shielded wire. I just make my own custom cables.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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