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Old 4th October 2012, 01:39 PM   #7361
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If anyone has time would they like to read Naim's new white paper . It is to replace LM317 I think ? Salas might be interested .


http://www.naimaudio.com/sites/defau...012_issue1.pdf

Last edited by nigel pearson; 4th October 2012 at 01:49 PM.
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Old 4th October 2012, 03:44 PM   #7362
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That is pretty much the setup of the Jung/Didden at first glance.
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Old 4th October 2012, 06:42 PM   #7363
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Quote:
Originally Posted by nigel pearson View Post
Hi Wave I am new to valves and learning , it is about having knowledge rather than loving them . I prefer diesel to steam locomotives so there is no hope I guess ( forget electrics that's class D ) . It has to be said steam comes very close and valves too . The Brits call old radios " steam radios " !?

I found by happy accident the right way to do it and the one you recommend . I had a nasty moment when my head went into reverse gear applied the opposite bias that I intended . As you say it survived . The heat haze coming off of the cathode resistor let me know first .
It is pure coincidence that tubes were used before semiconductors. Otherwise "steam machine thinkers" would consider semiconductors as "steam machines", tubes as "vacuum rocket science".
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Old 4th October 2012, 06:50 PM   #7364
bcarso is offline bcarso  United States
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Not exactly in vacuo but getting there: Ballistic transistor - Wikipedia, the free encyclopedia
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Old 4th October 2012, 10:51 PM   #7365
benb is offline benb  United States
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Not exactly in vacuo but getting there: Ballistic transistor - Wikipedia, the free encyclopedia
Wow - think that'll be fast enough for audio?
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Old 4th October 2012, 11:11 PM   #7366
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Wow - think that'll be fast enough for audio?
Yes, for digital audio.
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Old 4th October 2012, 11:55 PM   #7367
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I seem to remember a story at a Polish mathematician theorized what is basically a FET long before semiconductors were invented. Something like, "if you had a material that behaved like this, you could do that with it" kind of thing.
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Old 5th October 2012, 12:21 AM   #7368
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The point is, in order to design semiconductor devices "vacuum step" was not needed. Both could be designed at any time independently. The myth that semiconductors are superior, and superior only, is the result of market economy that needs new stories in order to advertise new production. Solid state diodes were used before tubes. But the industry did not went further than diodes because vacuum tubes were better than point-contact diodes.
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Old 5th October 2012, 09:46 AM   #7369
DF96 is offline DF96  England
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With modern micro-machining etc. what density of active devices might be achieved in a vacuum thermionic integrated circuit, so how big would a cell phone have to be and what heater power would it consume?
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Old 5th October 2012, 09:49 AM   #7370
SY is offline SY  United States
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With micro-machining, heaters are not needed.
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