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In the Forum: Analog Playback
In the Thread: Lamm’s new phonostage.
Post Subject: Sorry, you are wrong.Posted by Romy the Cat on: 1/16/2013
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 N-set wrote:
While I agree that they are typical "full of nothing" boxes and in no way I'd like to defend anything connected to them, but
I doubt that the SUT-to-grid distance is such a critical layout parameter: 1) this wiring is within the box so in principle in a well controlled environment; 2) after the SUT the signal is amplified, so less noise critical; 3) The cart-to-SUT distance is anyway much much larger than SUT-to-grid, at lower levels, and outside the box.
  
The cable or wire that connects SUT to first gain stage of phonstage is the most critical cable in the entire system. Your explanations are very much incorrect. The wiring within a box is not necessarily a well controlled environment. Lamm does not use point-to-point connections but circle boards with traces - that made for easy assembly, service and box filling. After SUT the signal is NOT amplified.  A transformer is a passive element and therefore there no extra power obtained. The increase in voltage comes with a corresponding decrease in current. So, a transformer modifies load impedance proportionally to square of the turn ratio. Now we have a cartridge with a few Ohm own impedance and virtually no current produced driving an impedance multiplication devise. If you have 25 times transformer and let say one feet of cable after the transformer then the transformer let cartridge to see 25 feet cable with 25 magnifications of any issues that this cable has. The cart-to-SUT distance is much larger but this is distance that cartridge drives directly. The distance behind the SPU the cartridge has a LOT of difficulty to drive. If you never did those experiments then you might try.

The Cat

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