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Post by MartinT on Oct 16, 2014 6:59:22 GMT
I'm in Basingstoke, so a bit of a way from you. However, let's try to organise something after the Christmas madness if possible. More bass I do not need!!
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Post by Sovereign on Oct 16, 2014 11:57:02 GMT
I'm in Cape Town for Christmas, so after then sounds good .
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Post by John on Oct 18, 2014 6:39:48 GMT
I been to Cape Town a few times a great City to visit
Do the wine tour but get someone else to drive!
If you can get someone to take you into Crossroads that knows the area
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Post by Sovereign on Oct 18, 2014 6:50:06 GMT
The food, the mountains and the people is what attracts me there. I've been to SA five times I think, traveling from north to south .
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Post by John on Oct 18, 2014 7:08:38 GMT
Yes I been their twice great food great people and great Mountains I love places like Observatory It also has some great Beaches
I loved Harmes too Great for whale watching
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Post by MartinT on Oct 18, 2014 10:21:43 GMT
I took the tour around Table Mountain when I was . . . 14! We docked by ship on our way to Australia. I still remember the steam trains.
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Post by Deleted on Dec 2, 2015 13:24:12 GMT
 Above is a simplified B/H curve this would apply to a transformer in a SECA valve amp with output coupling using a transformer. Now with a DC bias the transformer would not be running and using all the linear part of the curve, and would be biased in one direction up or down. To correct this I tried with some success to force the transformer to operated over a bigger area of the curve and close to point (a) then to use the whole extent of the curve I forced the flux density to the negative toward point (f) using a DC coil to produce a electromagnet, this worked very well and sounded good. It then occurred to me why go to the trouble of an electromagnet when a permanent magnet would do the same job, so with care I drilled a hole into the core and fixed a small magnet, this work also so I now need to go back to this and try out on a commercial design not a shoe box and veroboard. It was over 20 year ago and I have just found my notes, god my handwriting is like a spider pissed on vodka with muddy boots.  |
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Post by MartinT on Dec 2, 2015 13:53:47 GMT
Could you alternatively apply that curve in inverse to compensate for the transformer's non-linearity? Good idea with the permanent magnet!
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Post by Deleted on Dec 2, 2015 14:31:58 GMT
Could you alternatively apply that curve in inverse to compensate for the transformer's non-linearity? Good idea with the permanent magnet! Martin I am going to try that and with square law material, as used in MagAmp PSU designs. |
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