Got this amp for repair. sound from outputs - high frequencies sounds disorted, when all filters are off. When comes bigger bass - amp is shutting down, green light turns off. What should look for? Power and output transistors seems to be okey. But seems like this amp was repaired before. KTD998 has replaced with this, i guess, 2sd998. Why there is such a difference with size? Is it ok to leave it and dont replace? I have service manual.
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Email me the service manual.
babin_perry@yahoo.com
Which transistor was replaced with the smaller one?
babin_perry@yahoo.com
Which transistor was replaced with the smaller one?
Perry, I was looking at datasheet and I didnt found difference
KTD998 KTD998 pdf, KTD998 description, KTD998 datasheets, KTD998 view ::: ALLDATASHEET :::
2SD998 http://www.svntc.com/TPDF/1698.pdf
manual sent, i will take a look which one was replaced.only one KTD998 was replaced with 2SD99. I should check the other channel output sound.
KTD998 KTD998 pdf, KTD998 description, KTD998 datasheets, KTD998 view ::: ALLDATASHEET :::
2SD998 http://www.svntc.com/TPDF/1698.pdf
manual sent, i will take a look which one was replaced.only one KTD998 was replaced with 2SD99. I should check the other channel output sound.
The datasheets you have are both for the larger transistor. The smaller transistor is obsolete so it's difficult to find the datasheet for it. You will have to get the larger KTD998 or an equivalent transistor.
From the service manual, it appears that the transistors are clamped down by a plate. If that's the case, you should be able to use the FJA4313 and FJA4213 as subs (to replace both outputs in the defective channel).
Also check the emitter resistors to confirm that they're within tolerance.
From the service manual, it appears that the transistors are clamped down by a plate. If that's the case, you should be able to use the FJA4313 and FJA4213 as subs (to replace both outputs in the defective channel).
Also check the emitter resistors to confirm that they're within tolerance.
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