Favorite High Power Output Transistor

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#221
Confirmation on Affirmation

rajeev luthra said:
Hi ampman,
I think I can say "" Balle Balle "" Chack de Fathe ""

For others
above is something like wow in punjabi a north Indian Language

Ampman why not float an amp design with the above device like the other great amp designers

Cheers
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"Luthra Saab Hun Ta Chakk du fathe"

Happy DEEPAWALI [festival of lights 12Nov ]

Rajeev thats like a true INDIAN support from u which I welcomed.

I will definately float an amp design Featuring high Slew rate , bridged outputs and much more in a few days using only APT devices with full fotos.

Till Then Stay Tuned

ampman
 
#224
Ampman writes

((I will definately float an amp design Featuring high Slew rate , bridged outputs and much more in a few days using only APT devices with full fotos.Till Then Stay Tuned
ampman ))

Well Well
Ampman you always have my good wishes and ASHIRWAD , go ahead you have support from all over the world !!!!!!

Cheers
 
#225
GAL SUN RAJEEV

rajeev luthra said:
Ampman writes

((I will definately float an amp design Featuring high Slew rate , bridged outputs and much more in a few days using only APT devices with full fotos.Till Then Stay Tuned
ampman ))

Well Well
Ampman you always have my good wishes and ASHIRWAD , go ahead you have support from all over the world !!!!!!

Cheers
Click to expand...


ONLY GOOD WISHES NO ASHIRWAD REQUIRED

Regards
 
#229
They are all chips. Just a question of how many in a package.
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That friend of mine who built a gainclone and said the sound is good, HAVE to equipped the chipamp with expensive Resistors, Capacitors, ETC. He uses BlackGate everywhere. Then the sound is good. If you put ordinary components, then the sound is not special.

I've got a "DIYer" point of view of chipamps. Chipamps have an advantage that discrete design cannot have, that is a very minimal distance between components. They are fabricated on a very small area, minimizing track distances. Also they have a united heat radiation, all coming from a single surface, the semiconductor plate.

BUT, chipamps also have disadvantages. All components are made of semiconductor material. Like Resistors, Capacitors are made of silicon. I think silicon are suitable just for making transistor and dioda only, not for resistor and capacitor. In other thread, people even don't want to use tantalum capacitor for audio signal, but in chipamps, they have no choice but to use capacitors made of silicon.

So, even chipamp are considered good sounding, I think they cannot surpass the quality of good discrete designs, where we can choose the right components that are not made of silicons. If someday we can have a custom chipamp that inside they only consist of transistor and dioda only, and we can put all resistor and all capacitor with outside pin, it will be a better chipamp.
 
#230
I think there is also the issue of very high feedback ratios. There is so much more to an amp than THD, slew rate and power output. With chip amps, these things are fixed to a degree. Basically, Sanyo and Technics are the leaders in chip amp design.
Chip amps are more suited to utility amplification when compared to good discrete designs. Like Nelson, I like one chip per package.
-Chris
 
#231
Lumanauw:

Designers recognize the compromises in designing
integrated circuits and design around them, or take
advantages where they can get them. So short
paths and tightly matched components on the same
silicon are put to effective use.

I've got an old RCA hybrid amplifier here that dates
to the early 80s I think; it was compact for its time
and actually used mostly discrete components on a
ceramic substrate. Lots of crossover distortion, too.

BrianGT's combined power supply and amplfier boards
take up slighly less room than the RCA package, which
still required a number of external components. The
National chips have much lower distortion and higher
output power, and cost a fair bit less, too. Sounds like
progress to me.
 
#232
Commentable thoughts

rajeev luthra said:
Ampman
In our country some of the values given by parents to children is to always take "Ashirwad " from your elders , we should always keep our feet on the ground , anyway as you say I take back my "Ashirwad "

Cheers

Rajeev Luthra
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RajeeV Dont go so much Emotional and control ur Sentiments , or they will hurt u

i am also living in same country in which u live therefore I also know the importance of ashirwad

regards
 
#234
Confirmation on Affirmation

rajeev luthra said:
Ashirwad means blessings , what is wrong if someone elder to you gives you good wishes and blessings , I even today take blessings ( ashirwad ) of my elders .
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Wow RajeeV is Elder than me,
Rajeev is BIG BIG brother HA HAHAHA HA HA :smash: :smash:

What is ur age are u an oldman of 65 years IF yes I will take ur blessing if not than forget about anything?? Just dont worry and be happy. man.
 
#238
Hi Big Brother

rajeev luthra said:
Ampman
Thanks for acknoledging ,
May Allmighty God Bless You and you may excell in your work
Yours truly
Rajeev


PS -- now better speedup the amp project as we have taken up everyones valuable time , I too will be posting photos of the progress of my amp shortly
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Hi Rajeev paji
Do u belong to Punjab as Luthera's are punjabi KHatri in my opinion.

paji i am very busy with my class-D R & D but I will Demonstrate the project in early December with full protection circuits also.
Till Then stay tuned and thanX for Blessings as we both are Indians therefore India must progress in this Forum also.
Congratulations on ur Zeta amp.

Regards
kanwar Abhishek Singh
 
#239
Hello
I have finally received the ordered output transistor pairs 2SC-5200 and

2SA-1943 for my amp ( I hope they are original , they seem to be ,on

them is printed Toshiba Japan ) Photo of transistors attached .
I could have easily used MJE1503X drivers but as K-amps has

suggested to use 2SC-5200 and 2SA-1943 as drivers too , I will be

doing the same , also I can use the devices that get left out after

selecting the matched pairs for the output , this is an added attraction ,

however I can use MJE1503X also . Now I have increased the output

devices to 11 pairs as per Andreas Ws suggestion .
I am making the pcb layout on graph paper and will plan a simple layout

so that it can be handpainted on a single sided board . All components

and transistors will be accomodated on a single board .
Rajeev
 

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#240
Rajeev,

They seem to be real, where did you source them from? Also you may want to search the forum for 2sc5200 and 2sa1943 for pics on fake and real TOS parts.

Good luck on the project.

By the way where is ampman with his design? He said december didnt he? 😉
 
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