Technics se-a100

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toma5659

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Joined 2013
#1
Hello,

I just bought an Technics SE-A100 which seem to be in a very good condition
No earlier repairs, just functional.
Do I need to take care of some parts inside or just play it?

Thanks a lot in advance for your answers.

Lovely chrismas day and an very good 2017 for all of you.
 
#3
toma5659 said:
Hello,

I just bought an Technics SE-A100 which seem to be in a very good condition
No earlier repairs, just functional.
Do I need to take care of some parts inside or just play it?

Thanks a lot in advance for your answers.

Lovely chrismas day and an very good 2017 for all of you.
Click to expand...


Well, depends, if you want to hold on to this fine amplifier for a long time, you may want to consider buying a few spare part transistors. Quite often the amplifiers develop popping noises that can be quite nasty to the speakers and ears.
I have a SE-A5 and found some transistors operate quite hot, too hot for my liking. I feel they need a small clip on heat sink. Prolonged operation at elevated temperature of these transistors can lead to breakdown resulting in popping noises. Once that happens you may need to replace transistors. Often it happens in the voltage control amp.

See emitter resistors R147, R149 and R131 are quite low and currents through the transistors create some dissipation.

I would recommend to get these as spares, they may not even cost much money.

Q117 2SA1309
Q119 2SA1370
Q127 2SC3467
Q125 2SC3311
Q121 2SA1370
Q123 2SC3311
Q113 2SB1036



my 2 cent

Cheers and Happy Holidays
 
#5
toma5659 said:
Do I need to take care of some parts inside or just play it?
Click to expand...

Yes, there's something you need to take care of. These 30yr old amps are tightly packed and quite the dust collectors. The dust has to be cleaned out, it heats up transistors which causes them to age much faster or blow 'unexpectedly' since they run hot already in normal conditions and it also hides (physically) leaking rail capacitors, which also have to be checked. After ~30years it would probably be time to think about replacing them anyway.
 
#6
This is bad advice. Semiconductors very rarely fail from heat, and just expecting them to fail and be able to fix it simply by replacing them is rather ridiculous. Not to mention all the transistors mentioned are obsolete and any part you ever find will be fake and useless.

Keep using them amp as is if it is working. There's no point in preparing for its demise. If it fails it fails, find the fault then. Probably won't happen in your lifetime though.
 
#7
This is a fine amp. Don't do unnecessary brain surgery here. What you might want to consider is a recapping of electrolytic caps which may have dried out after 25 years. Even here,tread carefully and be absolutely certain that correct polarities are maintained before powering on again. If you have done any work inside at a minimum use a light bulb tester or better a variac before powering up. If you know what you are doing you might want to check the bias of the voltage and current drive sections because they probably have drifted over the years.
Cheers
 
#9
Hello to you all.
Thanks a lot for the nice and well meant advice concerning the sea100.
Inside it's very clean, no dust present, it was barely used and was kept in an dustfree storage.
I'll looked carefully at all the component's inside, but couldn't find any trace of leaking capacitors or electrolyt.
Untill now it's working fine and hope it will do so in future.
I'll just enjoy the amplifier!!!!!!

All advice's are still very welcome, as I don't have any experience with this type of amplifier.
Thanks
 
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