which one is best in sound quality 2sc5200 1943/ Sanken 2SA1216,2SC2922/ Sank std/sap - Page 3 - diyAudio
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Old 31st December 2012, 08:09 AM   #21
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let me define horrible for a minute ...

beyond spectrum analyzer and scope on a variety of loads there is always a listening session for an amplifier ...

To put you more in the picture it is my job to repair amplifiers...today i repair an average of 400 per year ...so to keep thing in control i have a near field set of speakers ( quite bright) specific music that i know very well ( with some variety ) but what is really important is that for almost 5 years the rest of the system including sources is always the same .

This as a practice alone i suggest to anyone that wants to evaluate condition A to condition B which only consume time and will cost no money only thing you need to do is consume time yo learn your music and system very well .

Expanding to a huge variety of music and 4 sets of speakers or sources produces way too many variables and results that are not usable for A to B tests .

So every time an amplifier is on a listening test things like, sound stage,bandwidth,depth, speed ,distortion (s) , guts, coloration ,discoloration and many other information that the ear can ""see"" about sonic behavior that instruments canot present as graphic images ...

kind regards
sakis
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Old 31st December 2012, 02:50 PM   #22
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Quote:
Originally Posted by sakis View Post
let me define horrible for a minute ...

beyond spectrum analyzer and scope on a variety of loads there is always a listening session for an amplifier ...

To put you more in the picture it is my job to repair amplifiers...today i repair an average of 400 per year ...so to keep thing in control i have a near field set of speakers ( quite bright) specific music that i know very well ( with some variety ) but what is really important is that for almost 5 years the rest of the system including sources is always the same .

This as a practice alone i suggest to anyone that wants to evaluate condition A to condition B which only consume time and will cost no money only thing you need to do is consume time yo learn your music and system very well .

Expanding to a huge variety of music and 4 sets of speakers or sources produces way too many variables and results that are not usable for A to B tests .

So every time an amplifier is on a listening test things like, sound stage,bandwidth,depth, speed ,distortion (s) , guts, coloration ,discoloration and many other information that the ear can ""see"" about sonic behavior that instruments canot present as graphic images ...

kind regards
sakis
true coz just graphs of freq time are not sufficient to judge..
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Old 1st January 2013, 10:12 PM   #23
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i just got a pair of 2sc5200 1943 pair and find them little bit muffled and highs not as clear and transparent as Sanken...
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Old 1st January 2013, 11:11 PM   #24
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Originally Posted by rhythmsandy View Post
i just got a pair of 2sc5200 1943 pair and find them little bit muffled and highs not as clear and transparent as Sanken...
Apart from it being highly unlikely anyone would hear such obvious tonal difference between modern high Ft audio power transistors, you don't show the application, type, schematic or conditions of comparison.

Bear in mind that any obvious differences will be in circuits that are not optimal for the particular device or possibly fakes which are quite common now due to our careless bargain buying practices. You can't be certain what you are comparing unless buying from the manufacturer or their certified distributor.
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Old 1st January 2013, 11:40 PM   #25
ilimzn is offline ilimzn  Croatia
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Actually, with most modern audio output BJTs there is a lot going on in the emitter structure that makes direct comparison under 'same conditions' difficult, at best. At the very least, even keeping output topology exactly the same, there will be differences in optimal standing current, and it is I think beyond discussion that getting this right indeed changes the sound of an amp. 2SC5200/2SA1943 are rather different from 2SA1216/2SC2922 in this respect, and that's only one point of difference, actually one of the simpler ones. For instance, 2SA1216/2SC2922 will happily operate without external (note!) emitter resistors and with proper compensation remain thermally stable.
Things get far more involved once changes of beta with current, changes of Ft with current and chnages of capacitances with almost everything are taken into account.
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Old 1st January 2013, 11:45 PM   #26
JMFahey is offline JMFahey  Argentina
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Agree.
Output transistors, being most often used as unity gain followers (and if not, as unity gain complementary pairs, which ends up being equivalent) by definition have the most extended trequency response they can provide.
In this case, the transition frequency is given as 30 MEGA Hz.
And they are typically used not by their own, but within complex, lots of NFB designs, which would certainly *swamp* any audible difference, at least something so gross as to be considered "muffled", which implies *many* dB loss at audible frequencies.
Which is not the case.
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