Reliving.
Active Member
Is there one for the C1345 transitors
Once more Sansui transistor substitutions
- Thread starter ToniCH
- Start date
It depends a bit 'where' it is being used (PSU? Driver board? etc...), but in the vast majority of cases the KSC1845 will do it, and in the remainder KSC1815 is the one. (this is due mainly to the higher 'collector current capability' of the KSC1815, which might be an issue depending on where the original was/is used).
thanhky1985
Active Member
2sc536e leaking badly,Sound break
Sui-Yogi
Super Member
2SA733****2SA1576 ( if you willing to solder SMD on adaptor.
I get that. Trying to avoid it. I've done it on some Mosfets before. Have a good collection of adapters
JoseHH
Super Member
These are similar, but not quite the same as the KSA733 or NEC 2SA733. (But at least Digikey states them as BCE) but not said in the datasheet. Check them out, ask them if the ECB is correct on their webpage.
In my opinion it is not correct to say a 'transistor is leaking' unless it has a resistance reading from Collector to Emitter, and is thus passing current (leaking) when it should not be.
With Germanium transistors 'Leakage' was very common and almost an 'expected' characteristic. However, with Silicon transistors this is virtually unheard of unless the transistor is actually faulty, with open or shorted junction(s) or low or non existent hFE, or some other characteristic that is out of limits.
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thanhky1985
Active Member
2SA606/2SC959 --- NTE129MCP (Complementary pair product #)
currently out of stock anywhere i am ordering tta004 and ttc004
currently out of stock anywhere i am ordering tta004 and ttc004
NTE went belly up and closed their doors.
i think i need to add another article about the sound of transistors. because i feel each transistor has a different characteristic sound so that people can choose the right place to put them. and it is mostly related to the frequency mhz and hfe. for example high frequency mhz i feel that it gives a faster sound, the music feels faster each instrument sound is played faster ends faster.
If you do, you'll be entering highly contentious territory, so I wish you good luck. I personally don't think transistors 'have a sound' - circuit arrangements are designed to achieve a circuit specification, and transistors are chosen for their characteristics to achieve that specification. I'll agree that fT and hfe are important characteristics and replacing transistors with lower spec' substitutes can cause a change in the presentation of sound, but that doesn't mean that 'in and of themselves' transistors 'have a sound'. You also touch on things regarding 'bandwidth' and 'slew rate' and maybe 'voicing' these parameters have a complex relationship, which I don't fully understand, so I'll be interested to see what light you can shed on this.
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Sui-Yogi
Super Member
Looking forward to reading your article!
thanhky1985
Active Member
maybe just need 1 starting article and need many people to contribute their opinions, each person gives their own experience on 1 or 2 types of transistors. Here is the image of ksc2690 and 2sc959
2sc959 gives a thicker, warmer sound than ksc2690 50% if compared by switching left and right channels. If compared in terms of technical parameters, ksc2690 has higher index in all aspects
Attachments
try it and feel it. you will believe it is true. it is the same as carbon resistors, carbon film and metal film resistors. it is also a very controversial issue. i am not an expert in amp electronics but i spend time feeling each resistor each transistor. unlike the repairmen who just know how to replace the whole thing. to make the amp work regardless of how it sounds. i try to mount it on one channel first and listen to see if there is any difference. and then i mount it on 2 channels and listen for 3 days to 1 week. maybe on 2 channels it gives a more harmonious sound, more pleasant to listen to, maybe it will be harder to listen to. , too shrill or too low... i believe that repairmen can never do that. because they don't have much time. so they think it doesn't happen. and they don't believe itIf you do, you'll be entering highly contentious territory, so I wish you good luck. I personally don't think transistors 'have a sound' - circuit arrangements are designed to achieve a circuit specification, and transistors are chosen for their characteristics to achieve that specification. I'll agree that fT and hfe are important characteristics and replacing transistors with lower spec' substitutes can cause a change in the presentation of sound, but that doesn't mean that 'in and of themselves' transistors 'have a sound'. You also touch on things regarding 'bandwidth' and 'slew rate' and maybe 'voicing' these parameters have a complex relationship, which I don't fully understand, so I'll be interested to see what light you can shed on this.
i just ordered 2sc959 unused old stock. for $17.50 + shipping is $21 for 2. i also saw them selling a whole set to replace the f1180 driver circuit with all ksc2690 and 1120
, and the sales are so much, it's heartbreaking for those who bought it and replaced it. the sales of that product are also the number of people who lost the sansui sound. but they don't know
thanhky1985
Active Member
2SA606/2SC959 --- NTE129MCP (Complementary pair product #)
i just got the toshiba tta004 and ttc004. from digikey. i tested it in place of the 2sa606 and 2sc959. the sound completely changed. the mids are back and level with the treble and bass. the mids are neither bright nor thick. average. more instrumental. feels like a cheap rechargeable speaker from aliexpress. i took it apart and threw it in a corner. probably just to replace power supplies. luckily i only bought 14 in total
i just got the toshiba tta004 and ttc004. from digikey. i tested it in place of the 2sa606 and 2sc959. the sound completely changed. the mids are back and level with the treble and bass. the mids are neither bright nor thick. average. more instrumental. feels like a cheap rechargeable speaker from aliexpress. i took it apart and threw it in a corner. probably just to replace power supplies. luckily i only bought 14 in total
gslikker
Super Member
For the above problem, I am happy Sansui provided this midrange control knob on my AU888 amp.
My 2 cents:
There are many ways to influence the sound just by psychoacoustics, which includes reading internet forum info, ranging from transistor or solder sound to whatever some golden ear writes one should hear in the pricy cable domain.
Now, the golden ears, the forum techs, and anybody in between on this forum usually have one thing in common: they are getting old, their ears are deteriorating, but their writing abilities seem in no way affected.
This leads to any comment about how somethings sounds to a "hear nor there" to me, and as a tech I am happy to ignore it all.
My 2 cents:
There are many ways to influence the sound just by psychoacoustics, which includes reading internet forum info, ranging from transistor or solder sound to whatever some golden ear writes one should hear in the pricy cable domain.
Now, the golden ears, the forum techs, and anybody in between on this forum usually have one thing in common: they are getting old, their ears are deteriorating, but their writing abilities seem in no way affected.
This leads to any comment about how somethings sounds to a "hear nor there" to me, and as a tech I am happy to ignore it all.
At first I thought like you. It was funny when I read those golden ear articles. But one day I accidentally broke a resistor. But in that emergency I found a resistor with the right value, and unfortunately there was only one. And I had to attach it to one side. Then I don't know why I accidentally turned the balance knob a lot on that channel. Maybe while tightening the screw to tighten the pad holding the volume knob, I accidentally turned it with pliers. And then when I turned on the machine, I heard the sound was so strange today. It was so catchy. This song and this high-pitched part were what made me lean forward. Sometimes I sang along. From that day on, every time I replaced anything, I replaced one side first. And listened to it many times. Sometimes it took me 30 minutes to hear the difference. I also have to use a cable to convert from a 1-channel DAC to a 2-channel DAC to make the sound even, because there are some songs that have different sounds in terms of instruments on the left and right channels. Spend a few hours trying out what you haven't felt yet, if you discover something new like me. It will be very interesting. Because there are many people who can feel it, not just the golden ears. I am an amateur, but I can still feel it. I think a technician should find out why he can't feel what a normal person can feel. There are some technicians who have "oscilloscope" syndrome. It's not strange for people who have it.
there are many reasons why a technician doesn't know.
1. because if they know that the replacement loses the sound signature, it will be difficult to do the job. because they won't find the oem parts to replace it.
2. just make it work and not have trouble during the warranty period. it doesn't matter if it sounds as good as before.
3. there are technicians who know it but they have to pretend to say no because of the above 2 reasons. and they don't want it to spread further. don't want people to know more because of the above 2 reasons. and they always put it out when they come across it on the way.
4. there are technicians who are just a certificate. their skills are even worse than a normal DIYer. they are bad at everything but they have a technician certificate
there are many reasons why a technician doesn't know.
1. because if they know that the replacement loses the sound signature, it will be difficult to do the job. because they won't find the oem parts to replace it.
2. just make it work and not have trouble during the warranty period. it doesn't matter if it sounds as good as before.
3. there are technicians who know it but they have to pretend to say no because of the above 2 reasons. and they don't want it to spread further. don't want people to know more because of the above 2 reasons. and they always put it out when they come across it on the way.
4. there are technicians who are just a certificate. their skills are even worse than a normal DIYer. they are bad at everything but they have a technician certificate
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thanhky1985
Active Member
I never use the bass treble or mid knobs on the tone board. because "sound imaging" type players never like that.For the above problem, I am happy Sansui provided this midrange control knob on my AU888 amp.
My 2 cents:
There are many ways to influence the sound just by psychoacoustics, which includes reading internet forum info, ranging from transistor or solder sound to whatever some golden ear writes one should hear in the pricy cable domain.
Now, the golden ears, the forum techs, and anybody in between on this forum usually have one thing in common: they are getting old, their ears are deteriorating, but their writing abilities seem in no way affected.
This leads to any comment about how somethings sounds to a "hear nor there" to me, and as a tech I am happy to ignore it all.