DIY Mono SUT
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| Posted on May 26, 2016 at 05:32:26 | |
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Posts: 5
Location: QC Joined: May 26, 2016 |
Hi Kevin and All, I'm very happy to report that my DIY Lundahl 1681 Mono SUT is finally connected and so far sounds great! I connected only the right channel into the primary core and both channels to the secondary core. As Kevin informed me, the phono stage's impedance is halved from 47k to 23.5k. So the cartridge "sees" a load impedance of 23.5k divided by 13 squared (step-up ratio) which is equal to 139 ohms. Apparently, the ideal load impedance setting should be between the one given by the cart's manufacturer (>20 ohms) + 10x the internal impedance (50 ohms) or 70 ohms for my Otofon Quintet mono. I will let the transformer break-in for a while but if I wanted to get closer to 70 ohms and integrate a resistor (approx 42k), where would I solder the resistor? For example, between the secondary core and the wires to the RCA jacks? Would I need one or two in this case? Only to the + connection or both the + and - connections to the RCA jacks? I know it's supposed to be in parallel, I'm just not sure what that means - an image would be great... Thank you in advance for any help offered. Tony Montreal Tony Montreal
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| RE: DIY Mono SUT, posted on May 26, 2016 at 08:54:02 | |
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Posts: 5
Location: QC Joined: May 26, 2016 |
Ok, thanks Kevin for your answer and patience... I'm kind of new at this...
Tony Montreal
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