2sa968/2sc2238 - Page 5

Lumba Ogir · 17th January 2009, 08:57 PM

Michael,
that`s Toshiba as I know it, no KEC-FEC-SEC features as far as the eye can see.

Filburt · 18th January 2009, 08:36 AM

Quote:

Originally posted by Lumba Ogir
Filburt,
sorry, I did not mean to blame you, just was wondering why 2SC2238/2SA968 were originally chosen here. 2SC5171/2SA1930 are faster, have lower Cob, widely preferred and surely better sounding. On the other hand, with 2SC2238/2SA968 you don´t risk running into oscillation problem.

Can you point me towards people describing the differences? I originally chose the 2SC2238/2SA968 based on a reputation for detailed, balanced, very clear sound. I don't have enough experience trying different transistors to know one way or another.

I have worked with and on a decent amount of high speed circuits, though, so perhaps I could use these ones you suggest.

Lumba Ogir · 18th January 2009, 12:56 PM

Filburt,
the 2SC2238/2SA968 is definitely very fine, however the 2SC5171/2SA1930 even better, appears to be more linear, fT=200MHz@300mA (140MHz for 2SC2238). Please take a look at the datasheets. As a general hint, Cob should always be low in audio.
I would like to emphasize the need for generously dimensioned heat sinks to reduce distortion, increase stability and to prolong life. Place Q10/Q11 in close proximity to the output transistors but thermally separated.

JKoch · 31st May 2010, 05:07 PM

Hi

I'm looking for pair of 2SC2238/2SA968 genuine Toshiba for Krell KSA 50 Mk-2. I get offer from one of China distributor for them. In last yera I bought other Toshiba's transistors from the distributor with success (they were genuine Toshiba ones). Now in this offer he told that both transistors are manufactured by Toshiba and are compliant with RoHs. I have a question: when the new Toshiba logo was changed and if it is possible that 2SC2238/2SA968 were compliant with RoHs Directive. The RoHs Directive started in 2006. Could anybody answer to my question? Thanks so lot.

AndrewT · 31st May 2010, 06:27 PM

in many (most) respects the 1930 appears as an improved replacement for the 968.

SOAR is not as good. @ 50Vce, 120mA for 1930, 210mA for 968.
Similarly all the way through the Vce range.

jacco vermeulen · 31st May 2010, 07:42 PM

Quote:

Originally Posted by JKoch

it is possible that 2SC2238/2SA968 were compliant with RoHs Directive.

Nope

JKoch · 31st May 2010, 08:06 PM

Thank you Jacco as I understand "Nope" means "No" compliant with RoHs. Just I get an offer from Japanese distributor (Figurenet) for 2SA968 in price USD8.73. In internet I found such seller who offer these transistors for USD2.00/pcs. as well as USD13,00/pcs. Those for USD2.00 looks as genuine (I see picture). Strange situation.

Telstar · 26th May 2012, 01:08 PM

I'm looking for slightly beefier transistors for the OPS oh jlh headphone amp v2005 (tailored for low Z load) and i came to these two:
toshiba 2sc3181
sanken 2sc2837

what do u guys think?

31st May 2010, 06:27 PM	#45
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	in many (most) respects the 1930 appears as an improved replacement for the 968. SOAR is not as good. @ 50Vce, 120mA for 1930, 210mA for 968. Similarly all the way through the Vce range. __________________ regards Andrew T.

26th May 2012, 01:08 PM	#48
Telstar diyAudio Member Join Date: Dec 2007	I'm looking for slightly beefier transistors for the OPS oh jlh headphone amp v2005 (tailored for low Z load) and i came to these two: toshiba 2sc3181 sanken 2sc2837 what do u guys think? __________________ The response of the inner ear extends to at least 200khz - Dr W. Tempest

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17th January 2009, 08:57 PM	#41
Lumba Ogir Banned Join Date: Apr 2005 Location: Stockholm	Michael, that`s Toshiba as I know it, no KEC-FEC-SEC features as far as the eye can see.

18th January 2009, 12:56 PM	#43
Lumba Ogir Banned Join Date: Apr 2005 Location: Stockholm	Filburt, the 2SC2238/2SA968 is definitely very fine, however the 2SC5171/2SA1930 even better, appears to be more linear, fT=200MHz@300mA (140MHz for 2SC2238). Please take a look at the datasheets. As a general hint, Cob should always be low in audio. I would like to emphasize the need for generously dimensioned heat sinks to reduce distortion, increase stability and to prolong life. Place Q10/Q11 in close proximity to the output transistors but thermally separated.

31st May 2010, 05:07 PM	#44
JKoch diyAudio Member Join Date: Dec 2005 Location: Gdansk	Hi I'm looking for pair of 2SC2238/2SA968 genuine Toshiba for Krell KSA 50 Mk-2. I get offer from one of China distributor for them. In last yera I bought other Toshiba's transistors from the distributor with success (they were genuine Toshiba ones). Now in this offer he told that both transistors are manufactured by Toshiba and are compliant with RoHs. I have a question: when the new Toshiba logo was changed and if it is possible that 2SC2238/2SA968 were compliant with RoHs Directive. The RoHs Directive started in 2006. Could anybody answer to my question? Thanks so lot.

31st May 2010, 08:06 PM	#47
JKoch diyAudio Member Join Date: Dec 2005 Location: Gdansk	Thank you Jacco as I understand "Nope" means "No" compliant with RoHs. Just I get an offer from Japanese distributor (Figurenet) for 2SA968 in price USD8.73. In internet I found such seller who offer these transistors for USD2.00/pcs. as well as USD13,00/pcs. Those for USD2.00 looks as genuine (I see picture). Strange situation.

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