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Old 5th March 2008, 11:08 PM   #1
hc167 is offline hc167  United States
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Default Question regarding to output power trans

hi:

I have a question. And hope someone can help. I have a Accuphase E202 and it stopped working. What was happening is when it powered on. I can hear "pop pop" sound so I shut it off right away. Then I did the same thing again to verify that the relay is click on. I hear the click from the relay. However, it also created some smoke from around the power trans region. I have not yet inspect the amp yet. So I would inagine that the power trans are gone. And the power trans are 2SA679 and 2SC1079. What are the best substitution for those transitors since I do not expect to get the original one (30 yrs old amp, what can I expect?).
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Old 6th March 2008, 12:25 AM   #2
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according to www.datasheetarchive.com the replacements for these are as follows:
2SA679:
2SA1028, 2SA1042, 2SA1061, 2SA1072, 2SA1097, 2SA1102, 2SA1103, 2SA1205, 2SA1265, 2SA1694, 2SA1685, 2SA1859, 2SA1866, 2SA1907, 2SA1908, 2SA1909, MJ15002

2SA1079:
2SC1584, 2SC2522, 2SD424, 2SD425, 2SD551, 2SD675A, 2SD733, MJ15001

you will probabky need to crossreference these to find which ones are intended as complements. if you look up the daa sheet for 2SC2522, it will tell you which of the 2SA numbers is it's complement. the MOT/ON devices ARE complements and are better (higher Vceo, Ic and Pd ratings with a similar beta range) devices than the originals.
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Old 6th March 2008, 01:03 AM   #3
Leolabs is offline Leolabs  Malaysia
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Are those Sanken ???If so,replacement would be easier.
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Old 6th March 2008, 01:06 AM   #4
hc167 is offline hc167  United States
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OK, so basically, what should I get? japanese transitor or Moto/OnSemi transitor? I know there is no right or wrong answer. But is it better for japanese amp to get the japanese transitors to make it sound as close as original? Or Moto/OnSemi transitor will actually do a better job? Also, since it is very old amp. Should I replace the drivers trans also?
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Old 6th March 2008, 01:07 AM   #5
hc167 is offline hc167  United States
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no, those are not Sanken, they are the old toshiba.
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Old 6th March 2008, 01:39 AM   #6
spind is offline spind  Canada
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I have 3 pairs (I believe) of these that I took out of an E-202. They were good then so they should be fine now. PM me if interested.
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Old 6th March 2008, 02:13 AM   #7
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as long as you get complementary devices, it shouldnt change the sound. if you were replacing stabilized-beta devices such as 2SA1302/2SC3281 your choices for replacement would be more limited.
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Old 6th March 2008, 07:58 AM   #8
poynton is offline poynton  United Kingdom
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Don't forget to put the smoke back in, it won't work without it !



oh, and don't forget to check the driver transistors and resistors as well.

Some electrolytic caps may also need replacing.


Andy
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Old 6th March 2008, 12:39 PM   #9
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"if you were replacing stabilized-beta devices such as 2SA1302/2SC3281 your choices for replacement would be more limited."

What about replacing 2SB1163 and 2SD1718 for 2SA1302 and 2SC3281? Will it work without any other modifications?
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Old 6th March 2008, 01:21 PM   #10
spind is offline spind  Canada
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Don't forget the MJ21193/94's or MJ21195/96's---probably the best TO-3 outputs that you can still easily buy. It sounds like there is more damage in this amp than just the outputs. The drivers on this amp are TO-66's which may be harder to find---however, I did get some from Consolidated Electronics a couple of years ago.
http://www.ceitron.com/

Good luck getting this amp going again,
Steve.
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