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In Reply to: RE: What are the advantages of interleaving on an SE OPT? posted by Frihed89 on July 15, 2015 at 01:47:14
This dude can say it better than me:"There is a technique that is used for valve output transformers, shown in Figure 11.6 - you will not find this method used in power transformers, as it is completely unnecessary and increases the primary-secondary capacitance dramatically.
Figure 11.6 - Interleaved Winding for Extended HF ResponseThe trick to winding transformers to minimise the winding leakage inductance and self capacitance is called "interleaving", but this results in much greater inter-winding capacitance. The most common way an interleaved winding is done is to use a multi-segmented winding, as shown in the sectional drawing of Figure 11.6. This type of winding is (or was) quite common for high quality valve output transformers, and the extension of frequency on the top end of the audio spectrum is very noticeable.
The capacitance between the primary and secondary can become troublesome with this technique, and although possible, an electrostatic shield (actually, a number of electrostatic shields may be needed) adds considerably to the cost, but creates a minimal overall benefit. This winding method is not used (or needed) with low frequency power transformers, and would lead to greatly reduced electrical safety because of the difficulty of insulating each section from the next. The same problem also exists with an output transformer, but is easier to control because one side of the secondary is earthed and the internal DC is already isolated from the mains.
Edits: 07/15/15Follow Ups:
Thanks. I have very bad high frequency hearing, so I am wondering if i get those benefits. My impression of the sound is that it is more present and alive. I feel closer to the music. Maybe it's just my mind rationalizing about the expense.
As we age, we lose HF hearing. BUT, there are resultants of the high frequency musical information, that comes " down the ladder" and lands in the mid range, where we all usually hear well.
So, us older listeners can tell from the MIDS, when the highs are " right ". Even if you are 85 and can't hear over 5 KHZ, or a mechanical watch ticking !!!
Jeff Medwin
Jeff is probably quite right here. In the violin-maker community it is well known that older, more experienced ears can tune the front and back plates as well and often better than younger ears with less knowledge/experience. There is no scientific (sine-wave) basis for this, just real-world experience.
Agreed, my hearing is definitely not as extended as it used to be but my system has never sounded as good since I added supertweeters.
Although I use a crossover point of 20kHz their beneficial effect is clearly "heard" by my other audio friends, all of whom are approaching their 60s and cannot hear sine waves much above 12kHz.
My critical brother now says that sound is near perfect and he cannot see me improving it in any meaningful way ... a BIG call from him I assure you.
Disconnect the supertweeters and every part of the audio spectrum seems to suffer to some extent, including sub bass ... go figure.
Naz
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