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Old 20th November 2004, 04:37 AM   #1
yugaaa is offline yugaaa  India
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Default faster transistors

Does sound improve when fast transistors are used ?Naim claims that the use of fast switching transistors improves the sound (their special output transistors) have a fast switching capability .

I have tried using some fast transistors ,and found remarkably good sound ,but I did also like to know views of others here ,on diyaudio .
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Old 20th November 2004, 06:45 PM   #2
AndrewT is offline AndrewT  Scotland
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I'm listening too.
info on predriver, driver and output transistors would be nice.
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Old 20th November 2004, 06:56 PM   #3
Mr Evil is offline Mr Evil  United Kingdom
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Well, faster transistors in themselves generally aren't going to be better for audio, given that they tend to have lower gain and be less linear. However, there are indirect benefits. For instance you may be able to get away with smaller compensation capacitor(s);if the slew rate for the stage preceding the output stage is increased then you may find that crossover distortion is reduced; gain at higher frequencies may be higher, which could result in lower distortion at higher frequencies (but probably higher distortion at lower frequencies).
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Old 21st November 2004, 02:42 AM   #4
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Really fast transistors are not generally a good idea for the VAS. If it is too fast, RF occilations may occur and cause problems. Generally you want to use a high gain, not too fast device for this.
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Old 21st November 2004, 10:20 AM   #5
djk is offline djk
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One of the better sounding amps I own uses outputs rated at 800Khz.

It sounds way better than most newer stuff with 30Mhz outputs.

It will get too hot if doing full power sine wave testing above 10Khz, so what? I don't listen to 800W worth of 20Khz too often.
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Old 21st November 2004, 11:09 AM   #6
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Cool Fater is Better?

Quote:
Originally posted by djk
One of the better sounding amps I own uses outputs rated at 800Khz.

It sounds way better than most newer stuff with 30Mhz outputs.

It will get too hot if doing full power sine wave testing above 10Khz, so what? I don't listen to 800W worth of 20Khz too often.

I concur. Current trend is faster and faster also made possible by faster semiconductors being available. I feel we run into oscillation problems, RFI interference etc. resulting in glare and harsh sound.
The Metaxas Audio amplifiers come to mind.
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Old 6th January 2005, 05:53 PM   #7
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Exclamation fast as Light?

Quote:
Originally posted by djk
One of the better sounding amps I own uses outputs rated at 800Khz.

It sounds way better than most newer stuff with 30Mhz outputs.

It will get too hot if doing full power sine wave testing above 10Khz, so what? I don't listen to 800W worth of 20Khz too often.
Hi djk, I concur the better sounding amplifiers are not fast as light................
(did you get my email?)

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Old 9th January 2005, 03:02 AM   #8
djk is offline djk
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No phone for the last week, weather related. Trying to play catch up now.
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Old 9th January 2005, 04:20 PM   #9
edl is offline edl  Hungary
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Quote:
Originally posted by djk
One of the better sounding amps I own uses outputs rated at 800Khz.

It sounds way better than most newer stuff with 30Mhz outputs.

It will get too hot if doing full power sine wave testing above 10Khz, so what? I don't listen to 800W worth of 20Khz too often.
2N3055?
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Old 9th January 2005, 04:24 PM   #10
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Quote:
Originally posted by edl


2N3055?
Hi edl,
I am more inclined using MJ21193 and MJ21194 with a Ft of about 6MHz.
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