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Re: I worship the DHT electric

84.153.34.155

Hi Stephen,

I arrived at the differntial circuit by a different way than people usually do. In my quest to minimize the components in the signal loop I finally had gain stages with 3 elements in the output loop. These were the SE circuit in ultrapath, or parafeed in ultrapath. These basically had the tube, transformer primary and 1 cap in the loop.

I must admit I'm not a big fan of component comparisons. Once I identify a good component I tend to stick with it. I still use the same type 8uF cap which I got years ago. I did attend cap comparison tests but got bored of them. I find much bigger differences in circuit topologies.

So I never tried to optimize the cap size in a parafeed circuit. Can't comment on that.

When thinking about how to get rid of that last cap, I came up with two ways to substitute it. Replace it with a resistor or with another tube. The solution with a resistor burns a lot of power. The circuit with the second tube happens to be a differential scheme.

I always note biggest improvements when geting rid of a cap. The differential circuit brings an additional benefit by the large immunity to effects form the power supply. I can add some kiloohms of resistance in series to the power supply connection of the diff phono without noticing any degradation.

I like my current single ended EC8020 phono the best. It's as simple as it can get, just the tube and transformer in the ouput loop.

Best regards

Thomas

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