@Mike,
i'm back and i saw we are linked at the Forum http://www.audiostereo.pl/ .
now i must read many post...
i'm back and i saw we are linked at the Forum http://www.audiostereo.pl/ .
now i must read many post...
MikeB said:
Christer said:
I can tell you: "yksi (pitkä) olut kiitos"
(You can leave "pitkä" away if you do not want large beer)
😀
In finnish discussion forum you linked, are mostly discussion about one finnish amplifier design. One guy who have build also symasym, said that maybe this finnish desing is not worth of build because symasym sound much better.
The casing? No it is the final box, wood with heatsinks left and right. But the connections will get some changes, I want XLR and maybe powercon...
I had better treble when i replace the output transistors to Sanken units
2SC2922 is the NPN...i was using 2SC5200 from Toshiba.
Related the suggested transistors to output, i cannot tell how they sound, as i do not have them...well, it was aproved and may be excelent.
But i could have better hi frequencies with this replacement i have made and telling you all.
Maybe with the Bittner`s indicated transistors the sound can be even better.... maybe.
regards,
Carlos
2SC2922 is the NPN...i was using 2SC5200 from Toshiba.
Related the suggested transistors to output, i cannot tell how they sound, as i do not have them...well, it was aproved and may be excelent.
But i could have better hi frequencies with this replacement i have made and telling you all.
Maybe with the Bittner`s indicated transistors the sound can be even better.... maybe.
regards,
Carlos
Hi 12 cents, nice job ! What did you use for output transistors ?
Carlos, i haven't tried the Sankens yet, from the devices i tried i found the MJL0281/0302 the best, the Toshiba sc5200 sounded a bit too soft for my taste... I still have to try mosfets...
Mike
Carlos, i haven't tried the Sankens yet, from the devices i tried i found the MJL0281/0302 the best, the Toshiba sc5200 sounded a bit too soft for my taste... I still have to try mosfets...
Mike
Well Mike...beeing you design, for sure will be good
And i already have Mosfets to try also into your design.
I am testing Holton units, and i can borrow some Mosfets to test your unit...keeping one channel of Holton amplifier untouchable... as it is elected as one of the 10 plus amplifiers... arrived to stay.
This amplifier from Holton is wonderfull, have exceptional sound.
Well...here is Symassym thread... and your unit is an Explendid unit of course.
Yes...i found 5200 mufled in comparison with the 2SC2922....i had much more brigth, more life, much more emotion in the high end with those units.
I had used in the past, but some monthes ago i decided to try some of them, the 2SC5200.
No!....of course amplifier did not sounded bad...almost impossible to make it sound bad...but had a new life....a more opened, aired...not soft sound...but present and defined...something sharp.
If diferences were easy to listen...yes!, they were easy to perceive as better option to output...well, better than 2SC5200.... about your design transistor, i can believe that it sounded great, but i really cannot confirm, as i could not use those output units till today.
Reliable the Symassym, very nice sounding, once adjusted do not change biasing...100 percent guaranteed!
Much more than explendorous thing.... it is explendorous, but i already did it!...so...explendid!
regards,
Carlos
And i already have Mosfets to try also into your design.
I am testing Holton units, and i can borrow some Mosfets to test your unit...keeping one channel of Holton amplifier untouchable... as it is elected as one of the 10 plus amplifiers... arrived to stay.
This amplifier from Holton is wonderfull, have exceptional sound.
Well...here is Symassym thread... and your unit is an Explendid unit of course.
Yes...i found 5200 mufled in comparison with the 2SC2922....i had much more brigth, more life, much more emotion in the high end with those units.
I had used in the past, but some monthes ago i decided to try some of them, the 2SC5200.
No!....of course amplifier did not sounded bad...almost impossible to make it sound bad...but had a new life....a more opened, aired...not soft sound...but present and defined...something sharp.
If diferences were easy to listen...yes!, they were easy to perceive as better option to output...well, better than 2SC5200.... about your design transistor, i can believe that it sounded great, but i really cannot confirm, as i could not use those output units till today.
Reliable the Symassym, very nice sounding, once adjusted do not change biasing...100 percent guaranteed!
Much more than explendorous thing.... it is explendorous, but i already did it!...so...explendid!
regards,
Carlos
HI Mike
If I understand well what you say that the MJL0281/0302 transistors are better choise than the MJL3281/1302 what you chose at first .
Would you please discribe the diference between these two type of transistors .
I have both type but I already solded the MJL3281/1302 transistors because that what you use at your desing at firts .
If there is a big diference for tha favour of the MJL0281/0302 please let me know so I can replace it before I power up the amp.
Thanks
Regards
If I understand well what you say that the MJL0281/0302 transistors are better choise than the MJL3281/1302 what you chose at first .
Would you please discribe the diference between these two type of transistors .
I have both type but I already solded the MJL3281/1302 transistors because that what you use at your desing at firts .
If there is a big diference for tha favour of the MJL0281/0302 please let me know so I can replace it before I power up the amp.
Thanks
Regards
Hi gaborbela,
What you have in there are excellent transistors as well. If you want, try the amp with the ones you have, then change them to see if you can determine any difference.
-Chris
What you have in there are excellent transistors as well. If you want, try the amp with the ones you have, then change them to see if you can determine any difference.
-Chris
Hi gaborbela, like Chris suggested, if you're in the mood, why not compare yourself as you have both ?
The difference i perceived was cleaner sound, the MJL3281 sounds "harsher" in comparison to the MJL0281, these new devices simply sound crystal clear.
You don't need an A/B test to hear the difference.
Mike
The difference i perceived was cleaner sound, the MJL3281 sounds "harsher" in comparison to the MJL0281, these new devices simply sound crystal clear.
You don't need an A/B test to hear the difference.
Mike
HI
Thank you guys for the reply , you know is not so simle to replace the transistors ,they already mounted on the heatsink , so that s why I wanted to know if is worth to do it .
And there is risk to damage the pc board if I swich the transistors many times .
Thanks one more time . .
Regards
Thank you guys for the reply , you know is not so simle to replace the transistors ,they already mounted on the heatsink , so that s why I wanted to know if is worth to do it .
And there is risk to damage the pc board if I swich the transistors many times .
Thanks one more time . .
Regards
Sorry Gabor, i am not trying to produce some argue about your own decision.
But i am happy if you listen my suggestion, as you may lost some very nice treble quality in you system because will left behind this simple test suggested.
You can cut one channel`s transistor base and colector leads..... down near the board....in advance make the board transistor soldering massive, to produce some delay in the future solder melting that you will needed to produce the solder again into the transistors base and colector leads (if you decide to keep things original again).....just keep those leads out of alignment related their direction continuity.... solder wires downward your boards and travel them into another heatsink with other new testing transistors.... the wire`s small capacitance and small inductance may not create Radio Frequency problems for you...also will not produce oscilations if you keep them as short as you can.
This way you can listen and judge...and better is to produce this change in one single channel, so you will be able to compare... almost simultaneously, both amplifiers...the one standard and the other channel modified.
Install one speaker in the top of the other, so, they will have same position in your room, and go inserting the left input plug, and them the rigth input plug...this way you can produce a hand dirty switching.... do not forget to repeat testing inverting the speaker position..or if you prefer...the wire positions..as one speaker will be at ground or stand or floor...and this produces sonic diferences.
I am sorry if i am explaining the obvious, you may be very experienced, but, there are a lot of guys that do not know those small and simple tricks, and they will learn some reading.....as i use to learn too.
If you did not apreciate the modification, you can solder the original transistor again in it`s own place, will produce a small rounded ball of solder, and the big amount of solder used under the board, will not be melted because the time needed to solder the leads will be smaller than the time needed to melt all the under copper trace solder.
I strongly suggest you to do so, as the ones suggested you to do, including myself, are that kind of guys that conclude things listening amplifiers and comparing...we do not evaluate nothing observing only Wave form data, distortion analisers data or computer simulations data...we go to real world to test....in special our excelent designer, Herr Bittner.
I think that amplifiers can be always increase, updated, upgraded and developed, and i am sure that Bittner is researching something more wonderfull than the last unit published...as you could see we had many Symassym, and one is a little better than the earlier one...and we must be opened to those things.
regards,
Carlos
But i am happy if you listen my suggestion, as you may lost some very nice treble quality in you system because will left behind this simple test suggested.
You can cut one channel`s transistor base and colector leads..... down near the board....in advance make the board transistor soldering massive, to produce some delay in the future solder melting that you will needed to produce the solder again into the transistors base and colector leads (if you decide to keep things original again).....just keep those leads out of alignment related their direction continuity.... solder wires downward your boards and travel them into another heatsink with other new testing transistors.... the wire`s small capacitance and small inductance may not create Radio Frequency problems for you...also will not produce oscilations if you keep them as short as you can.
This way you can listen and judge...and better is to produce this change in one single channel, so you will be able to compare... almost simultaneously, both amplifiers...the one standard and the other channel modified.
Install one speaker in the top of the other, so, they will have same position in your room, and go inserting the left input plug, and them the rigth input plug...this way you can produce a hand dirty switching.... do not forget to repeat testing inverting the speaker position..or if you prefer...the wire positions..as one speaker will be at ground or stand or floor...and this produces sonic diferences.
I am sorry if i am explaining the obvious, you may be very experienced, but, there are a lot of guys that do not know those small and simple tricks, and they will learn some reading.....as i use to learn too.
If you did not apreciate the modification, you can solder the original transistor again in it`s own place, will produce a small rounded ball of solder, and the big amount of solder used under the board, will not be melted because the time needed to solder the leads will be smaller than the time needed to melt all the under copper trace solder.
I strongly suggest you to do so, as the ones suggested you to do, including myself, are that kind of guys that conclude things listening amplifiers and comparing...we do not evaluate nothing observing only Wave form data, distortion analisers data or computer simulations data...we go to real world to test....in special our excelent designer, Herr Bittner.
I think that amplifiers can be always increase, updated, upgraded and developed, and i am sure that Bittner is researching something more wonderfull than the last unit published...as you could see we had many Symassym, and one is a little better than the earlier one...and we must be opened to those things.
regards,
Carlos
I have and extra set if you want to trade something for them. Some decent wima coupling caps or?
Sheldon
Sheldon
Ryssen said:Any one have 2 pairs of MJL3281/1302 to sell to me,as ONsemi only have them in 25/tubes.
Ryssen, did you get MJL3281/1302 ? If not, i have "some" left...
Mike
I popped some in the mail yesterday.
Sheldon
Mike have you tried the 4281 series? The data sheet makes similar claims regarding linearity and complementary pairs as does eh 0281 series.
Sheldon
Mike have you tried the 4281 series? The data sheet makes similar claims regarding linearity and complementary pairs as does eh 0281 series.
Sheldon said:
Hi Sheldon, i did not try these, i always thought of them as just high voltage types... I did not like them too much because of their early degradation with current, but that's of course only data sheet.
Mike