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Hi everyone,
can anyone share a dwg of how you would wire via switch 1:10 & 1:20 ratios. I have the bolt on version with all the windings extended. There website shows wiring for 1:20/40.
Regards Johno
Thks in advance.
Follow Ups:
google is your friend
Happy Listening
Cheers, I spotted that schematic preciously but didn't need the 1:40 ratio.
Dave Geren from cinemag kindly got back to me and pointed me to some pdf's they have at their website, he pointed me to a AN-111 schematic which is for a CMQEE-3440A SUT similar.
Cheers
Johno, you will love the 1254. I used a 3440A before and the 1254 is much nicer. However, you can use the diagram that 6bqr gave you and just hardwire one of the setups. Just remember that the no dot side hooks up to the ground. Good luck with your project.
Thank you, the 1254 SUT is an absolute audio bargain, cheers
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: 02/08/25
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"
thanks for the reply-
while you may not need the 1:40 ratio now,
at the cost of an extra switch, you get all three options...
Happy Listening
Cheers, just for interest have you built that switching option using the supplied google link? If so just wondering if you have a picture you could share, cheers Johno.
Currently have it temp connected listening x10 gain with zero hum and great sound through a AT0C9XSL cart. I like it a lot, plenty of meat on the bone so to speak.
A note on the wiring diagram says to hook up primary windings in series for 1:10 ratio
Agree but if u want both ratio's operational 1:10 & 1:20 via switching how would u do it?
cheers
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