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Old 27th September 2006, 01:39 AM   #101
clem_o is offline clem_o  Philippines
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Default Re: k series amp trannies

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Originally posted by audiomachines

5.Driver transistor 2SC5200 and 2SA1943
6.Output Transistors 2SC5200 and 2SA1943

Any idea if the transistors are "real" toshibas or fakes?

Cheers!
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Old 27th September 2006, 01:59 AM   #102
AJT is offline AJT  Philippines
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Quote:
Originally posted by audiomachines
hello,

I got some CrestAudio schemes Vs, CA, Pro Series etc.
If some of you decided to clone one sali ako.

Best Regards,
audiomachines
there is a guy here named ferdz, and also at pinoydvd, who is at 24 very well versed with protel pcb design software, i believe it won't be hard to convince him to design the pcb for us should there be enough interest on it.
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Old 27th September 2006, 02:00 AM   #103
AJT is offline AJT  Philippines
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Default Re: Re: k series amp trannies

Quote:
Originally posted by clem_o



Any idea if the transistors are "real" toshibas or fakes?

Cheers!
unlless you get them from the factory, it would be very hard to tell...


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Old 27th September 2006, 02:09 AM   #104
clem_o is offline clem_o  Philippines
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Hi Tony,

The Base to Emitter junction capacitance appears to be a good indicator of 'authenticity'. The real ones have a higher BE capacitance, due to larger die size.... usually a few nF. Specifics for the 2SC5200 etc I don't have however...

Thread is here:

My Transistors, original or copy?

Also, I guess if the transistors keep blowing up then its a good indication that they are fake... hehehehe!

Cheers

Clem
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Old 27th September 2006, 02:16 AM   #105
AJT is offline AJT  Philippines
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Quote:
Also, I guess if the transistors keep blowing up then its a good indication that they are fake... hehehehe!
yes, but i would'nt be too quick to call that, you can easily fry genuine transistors if the biasing is not right. i've learned that repairing Sansui amps....Sansunog is how we called those amps from the late 80' to early 90's....
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Old 27th September 2006, 02:35 AM   #106
clem_o is offline clem_o  Philippines
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Haha, nice name.

Re frying up transistors - true, however if the bias is set right and isn't drifting YET the thing transistors keep blowing.. We had an Onkyo amplifier with those particular symptoms. Came in with blown outputs, bought a set of trannies from Raon, put them in, check bias. Everything ok, even powering speakers for a while. Once you push the amp to high power levels, poof... Happened several times, and that's actually what started us guessing that we had fakes!

Cheers!
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Old 27th September 2006, 02:42 AM   #107
AJT is offline AJT  Philippines
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yes, that would be an unmistakeable analysis.... that is why i prefer to buy those junked boards with parts, than buy new trannies from say, DEECO... oriental, newport and liamco seem to be reliable though...
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Old 27th September 2006, 02:45 AM   #108
clem_o is offline clem_o  Philippines
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Hi Tony,

Hey, that's a great tip! Gracias!!

Clem
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Old 27th September 2006, 04:39 AM   #109
MGR is offline MGR
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Original toshiba transistors can be bought at DECIBEZ (Ronquillo St.)The A1943 and C5200 is priced at 150 each.You can buy cheaper transistors in RAON but it depends on their stock sometimes good more often fakes.
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Old 27th September 2006, 04:51 AM   #110
clem_o is offline clem_o  Philippines
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Hi MGR,

That's a bargain if those are real!!

I'm waiting for anatech if he can give me some capacitance readings on known original devices. When I have that info I'll bring a capacitance meter to Raon and check these out!

Cheers!
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