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Old 28th October 2009, 12:40 PM   #5401
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by thanh1973 View Post
You're not really being helpful here.
Lets see if he can get it working first.
Why is my information "unhelpful"?
Each of my three statements are offering guidance to help avoid expensive errors, expensive in either time and/or money i.e. resources.
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Old 28th October 2009, 12:49 PM   #5402
juma is offline juma  Serbia
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Originally Posted by thanh1973 View Post
Best way to learn is hands on.
Without proper knowledge, it's the best way to make complete mess.

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Experts are often wrong.
No, they are sometimes wrong. Non-experts are seldom right.
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Old 28th October 2009, 12:52 PM   #5403
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Every way to learn can be helpfull.
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Old 28th October 2009, 02:05 PM   #5404
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Originally Posted by lalaina View Post
Yes I have tesed it, I've compared the sound of the 9240 from IR with an 9240 from vishay. There are big difference, the 9240 from vishay is more softer and sound much better.

I want to know if someone have compared the 240/9240 to FQA19N20/FQA12P20 ?

lalaina
NP did -- but it's way back in the thread -- he also commented on it in the original AudioXpress article.

Vishay purchased the IRF Mosfet biz last year -- the devices are now being shipped with the ST Logo -- they test the same as the IRF devices, but I can't comment on the quality of the listening. One thing I have noticed is that the tubes are not date stamped, nor is the country of origin posted. The Vishay devices occasionally have fingerprints on the back indicating a lot of manual handling.

The Fairchild TO-247 devices seem to be going "unobtanium" -- while both Arrow and Mouser list them as available, none are in stock. This is a bit of casuistric ethics bending going on here with Arrow in particular -- they list an item so that it shows up on the search engines but it is nowhere to be found.

Fairchild TO-220 analogues seem to be in current production -- they handle a bit less current than the TO-247's.
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Old 28th October 2009, 02:46 PM   #5405
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Reading cascode article by NelsonPass

Dont know, but sounds to me its like a ccs, dealing with fluctuating voltage induced distortion
But also, like mentioned, cascode will make life easier on the Jfets
Especially when we want to raise voltage and drive multiple output devices

When suggesting that BCs will be fine fore cascode, are we forgetting the request fore raised voltage and multiple outputs ?
I mean, even if the Jfets will be working less, the first cascode transistor should be able to handle ALL the raised voltage and exstra work, or ?

Last edited by tinitus; 28th October 2009 at 02:50 PM.
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Old 28th October 2009, 03:00 PM   #5406
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Originally Posted by tinitus View Post
...
When suggesting that BCs will be fine fore cascode, are we forgetting the request fore raised voltage and multiple outputs ?
No, driving two pairs of output MOSFETS will be almost equally easy, especially Toshiba'a MOSFETs.
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Originally Posted by tinitus View Post
I mean, even if the Jfets will be working less, the first cascode transistor should be able to handle ALL the raised voltage and exstra work, or ?
Why ALL, what extra work? In the sch. I drawn the PS voltage (40V) is almost equally split between JFET and BJT (20V each). They share the same current and they will dissipate almost the same power.
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Old 28th October 2009, 03:07 PM   #5407
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Maybe the guy has a burning desire to bump the rails up to 100V and build himself an F50 ?

In that case i'd go for at least a 200V TO126 critter that copes with 1 Watt of heat without a heatsink, something exotic Sanyo or a stinkin MJE3**
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Old 28th October 2009, 03:09 PM   #5408
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Ok
Any reason not to use exstra pair of SK170/SJ74 fore cascode

Last edited by tinitus; 28th October 2009 at 03:19 PM.
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Old 28th October 2009, 03:13 PM   #5409
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I'd save that for the first ever All-Depletion mode power amp.

(not even the Japanese have concurred [=no typo ] that hill with their VFET stuff)

Last edited by jacco vermeulen; 28th October 2009 at 03:16 PM.
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Old 28th October 2009, 03:25 PM   #5410
tinitus is offline tinitus  Europe
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Will that be better
I now know how to hardwire th F5, and I like that
I reckon F5 is as good as it was yesterday
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