faster transistors

yugaaa · 20th November 2004, 03:37 AM

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 .

AndrewT · 20th November 2004, 05:45 PM

I'm listening too.
info on predriver, driver and output transistors would be nice.

Mr Evil · 20th November 2004, 05:56 PM

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).

cunningham · 21st November 2004, 01:42 AM

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.

djk · 21st November 2004, 09:20 AM

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.

Elso Kwak · 21st November 2004, 10:09 AM

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.

Elso Kwak · 6th January 2005, 04:53 PM

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?)

djk · 9th January 2005, 02:02 AM

No phone for the last week, weather related. Trying to play catch up now.

edl · 9th January 2005, 03:20 PM

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?

Elso Kwak · 9th January 2005, 03:24 PM

Quote:

Originally posted by edl

2N3055?

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

20th November 2004, 03:37 AM	#1
yugaaa diyAudio Member Join Date: Jan 2002 Location: india	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 .

20th November 2004, 05:56 PM	#3
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	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). __________________ https://mrevil.asvachin.eu/

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ways to discharge a mosfet faster	jegandren	Power Supplies	9	20th July 2008 08:05 PM
need drivers to be faster than outputs (all bjt)?	h_a	Solid State	10	15th April 2008 12:35 PM
How to make sub 'faster'	bvan	Subwoofers	15	27th June 2006 09:47 AM
Linux calls 60 times faster than IE	Lars Clausen	Everything Else	4	17th October 2004 03:58 PM
Is faster better ?	Alien8	Digital Source	8	5th March 2004 06:02 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

20th November 2004, 05:45 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I'm listening too. info on predriver, driver and output transistors would be nice.

21st November 2004, 01:42 AM	#4
cunningham diyAudio Member Join Date: Jun 2004 Location: Knoxville	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.

21st November 2004, 09:20 AM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	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.

9th January 2005, 02:02 AM	#8
djk diyAudio Member Join Date: Feb 2001 Location: USA	No phone for the last week, weather related. Trying to play catch up now.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)