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Old 10th August 2010, 07:25 AM   #101
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> without actually buying them.
I think that says enough!
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Old 10th August 2010, 09:23 AM   #102
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Bob,
It seems you have spent a great part of your life working with bjt, mosfets, jfet devices. You have engaged in in depth analysis of the inner workings of these items and formed educated reasonable opinions.
Has your research stopped at this point or will you continue on giving us accurate insight on newer items like the silicone carbide parts beginning to find there way into audio.
Also, were there any great advantages to the germanium transitors which can be found in many very old amplifiers. These are quite scarce now.
I would not find fault with a much do vacation at this time. It is not often we get a chance at direct communication with those more learned willing to share there experiences. A forum like this in Nikolai Tesla's time would have been enlightening to say the least.

Tad
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Old 10th August 2010, 09:50 AM   #103
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Default /OT

>silicone carbide?
Silicones are used to make big tits.
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Old 10th August 2010, 10:01 AM   #104
AndrewT is offline AndrewT  Scotland
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Can I suggest a new rule for the Forum?

Every existing Member who has posted in the amplifier section must buy a copy.

A stab at a second rule would be.
All new Members must prove they have bought and read a copy before they are allowed to post in the amplifiers section.

Bob,
can I get a share in the royalties?
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regards Andrew T.
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Old 10th August 2010, 10:11 AM   #105
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That almost sounds as "every member must know the Koran by heart".
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Old 10th August 2010, 10:11 AM   #106
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Quote:
Originally Posted by Edmond Stuart View Post
are used to make big
It's pronounced Silly-Cones.
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Old 10th August 2010, 10:19 AM   #107
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goed verliezen dan dooft het licht…(H.M. van Randwijk)
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Old 10th August 2010, 12:23 PM   #108
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Quote:
Originally Posted by anatech View Post
Hi Edmond,

Understand that until recently, commercially viable Mosfets were made by On Semi, IR and others. These are more suitable for inverters and such than music output stages.



-Chris
Hi Chris,

I have to disagree with you on one point. Although vertical MOSFETs were presumably designed for, and have found their greatest use in, switching applications, this by no means makes them any less suitable for audio (or any other application) than a device designed for audio (like lateral MOSFETs). It all depends on the parameters of the device and how one uses it. This would be like saying that an automotive relay is not good as a speaker relay; indeed, often they are (but it would be wrong to generalize this).

In fairness, there is another point to be made here. It is not just the device itself, it is somewhat how it is specified on the datasheet and how it is modeled in SPICE models. Here there may be some truth to the suggestion that the original area of application influences suitability for other applications. In many cases, the information on vertical MOSFET datasheets is switching-centric; a good example is the provision of gate-charge information which does not have an easily-interpreted relevance to an audio application. Another example is the unavailability of SPICE models that properly model subthreshold conduction. Yet another example is the cobbled models that are used to model the nonlinear gate-drain capacitance, some of which incorporate nonlinear elements into then like diodes.

Cheers,
Bob
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Old 10th August 2010, 12:30 PM   #109
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To those who did not play with vertical MOSFETs in the early days of Lateral MOSFETs, it may come as a surprise that vertical MOSFETs were the more expensive of the two back then.
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Old 10th August 2010, 01:57 PM   #110
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Quote:
Originally Posted by anatech View Post
Hi abraxalito,
[snip]
Keeping in mind what I know of Mr. Self's opinions gained from direct communication with him, Edmond's comments stated in the present tense are clearly not accurate.
[snip]
-Chris
Present tense, past tense or whatever tense, does it matter? I don't think so, as even the latest edition of his book (13 July 2009) contains exactly the same erroneous assumptions (read: prejudices) as the previous editions or articles in EW.
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