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1970s Design Indulgence

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jun 2019 at 11:23am
Having tried the flux-band on two different laminated transformers I can say I have not detected any difference in off-load current.

I also tried one from the amplifier, with and without its mounting frame, and was unable to measure any difference in off-load current.

I will qualify the above: there were changes during measurement which were in my opinion due to mains voltage drift, which you will get at certain times of day, especially on Sundays when some still cook the traditional Sunday lunch!

At this point two articles fork, as I am about to fit the other flux-banded transformer to the 5V 3A power supply.

Whether or not the flux-band works will have to wait for the laminated transformers to go back into the amplifier. Why I'm fitting a flux-banded transformer to the power supply is a matter of "faith".
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 2 minutes ago at 8:52am
Transformer research is hopefully drawing to a close.

Although the Antek 3450 toroidal returned a good performance, it didn't last the full week. It couldn't prevent the present day high frequency mains pollution 'fizzing' the electrolytics, which meant eventual bass loss.

(See chart here: https://www.audialonline.com/blog/psu-transformers-ei-vs-toroidal-and-more/ more info here: https://www.soundstagenetwork.com/maxdb/maxdb071998.htm)

The RS EI transformers are back in for the time-being, but will eventually be replaced by a pair of custom-made EI transformers from Transtronic.

These will have lower saturation at approx. 1.1T. The RS ones are approx. 1.4T. And mechanical noise should be lower.

Using more laminations, the Transtronic ones should allow a larger shadow region against magnetic fields, and this might improve the mains hum.

Currently, in a silent room, the hum can be just heard 300 mm away from the bass drivers of the LS3/5A's, but any further away it isn't heard.

I am sure the eventual declaration of S/N specification will be a turn-off for some, but what would they rather have? I would rather have full-bodied music than ice-cold thinness.

If it makes this amplifier mid-end or low-end in people's estimation, then let it be. All I know is that different artists or bands use different recording techniques, and some throw a lot of brightness into it. If then the amplifier cannot do justice to what's left of the bottom end, you simply discard the music and listen to something else. This results in picking the music to suit the equipment, and if that is what the high-end is about, then it isn't about music!

I think I have said the above so many times that people are fed up to the back teeth of reading it, but that is my way, and has been all-along.
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