nws56
pfm Member
Stage 3 - seperation of inductors. Rating *** vfm 10/10
That Danish guy Troels Gravesen used to have diagrams on his site showing badly positioned inductors and the electrical consequences of such.
I had this in mind when pondering over the 401 circuit board. The hf inductor and smaller mf one are so intimate that a condom ought to be required.
Previous restoration projects seen on t'web had always left these in their loving embrace. Then I came across an Australian site where a guy had seperated
them, but as part of a general upgrade of every other component. So he never knew the contribution of the seperation to the whole.
The perfect opportunity for fools to rush in !
It was the simplest thing to remove the retaining bolt and seperate the pair of them by some 4 inches. There was sufficient uncoiled wire to enable this
without disturbing any of the soldering.
I wasn't expecting the degree of improvement I heard.
A lot cleaner and clearer. Low level detail emerges from the background murk to play tunes and rhythms. Affects mid and high equally. Soundstaging too.
After extended listening sessions, realized that the entire mid/high performance had been compromised by this inductor interaction which was responsible
for unevenness and confusion.
Delighted by this (price-less) upgrade, but also a bit disturbed.
These things were hobbled and needlessly handicapped even as they came off the assembly line.
Thousands of proud owners who would have no idea.
I owe Troels a big thank you.
That Danish guy Troels Gravesen used to have diagrams on his site showing badly positioned inductors and the electrical consequences of such.
I had this in mind when pondering over the 401 circuit board. The hf inductor and smaller mf one are so intimate that a condom ought to be required.
Previous restoration projects seen on t'web had always left these in their loving embrace. Then I came across an Australian site where a guy had seperated
them, but as part of a general upgrade of every other component. So he never knew the contribution of the seperation to the whole.
The perfect opportunity for fools to rush in !
It was the simplest thing to remove the retaining bolt and seperate the pair of them by some 4 inches. There was sufficient uncoiled wire to enable this
without disturbing any of the soldering.
I wasn't expecting the degree of improvement I heard.
A lot cleaner and clearer. Low level detail emerges from the background murk to play tunes and rhythms. Affects mid and high equally. Soundstaging too.
After extended listening sessions, realized that the entire mid/high performance had been compromised by this inductor interaction which was responsible
for unevenness and confusion.
Delighted by this (price-less) upgrade, but also a bit disturbed.
These things were hobbled and needlessly handicapped even as they came off the assembly line.
Thousands of proud owners who would have no idea.
I owe Troels a big thank you.