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Old 11th August 2009, 07:58 PM   #11
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Hi Chris,
The 2SC371 was only one of the transistors taken out by a shorted output pair.
Replaced the outputs with OEM, several resistors, checked the drivers (OK), used an NTE 107 for replacement, but would prefer to use similar OEM type.
I have heard that using the 2SC945 in some audio circuits is not recommended since there is a tendency for noise.
I believe I read that on Audio Karma.
I have a 2A562 on hand I can use.
Thanks for your reply
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Old 11th August 2009, 08:28 PM   #12
anatech is offline anatech  Canada
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Hi Morgan,
Quote:
I have heard that using the 2SC945 in some audio circuits is not recommended since there is a tendency for noise.
False, completely false.

Perhaps the writer got some renumbered parts(=fake)? The 2SC458 was a problem device.

Quote:
used an NTE 107 for replacement, but would prefer to use similar OEM type.
You're kidding me - right?

NTE107 is good for 12 VDC C-E and 25 mA for IC and 200 mW dissipation. Now get this, it's and RF transistor, so the reverse E-B voltage is only 3 VDC instead of the normal 5 ~ 7 VDC for most transistors.

How did you come to see this as a good substitute? If you used the ECG or NTE Replacement Manual, you can see why I call them "the book of lies". I'm not kidding!

Quote:
The 2SC371 was only one of the transistors taken out by a shorted output pair.
No, they were the only transistors that actually failed. Some others were stressed and may fail later. The driver transistors in that channel should be replaced, as well as the bias control transistor. It was bad enough to blow a current protection transistor, so there may be more problems than you know about.

I used to do warranty service on these, and did them for years out of warranty. I'm trying to help you do a good job on this. Yank those transistors and test for gain and leakage (two modes). I'd say to simply replace them, the measuring is for your education in case something actually shows up. Leakage is in uA.

-Chris
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Old 4th April 2010, 11:20 AM   #13
Artie is offline Artie  United States
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Quote:
Originally Posted by Eva View Post
2SA763 [Toshiba] is also a small signal transistor :
200mW 30V 50mA
hFE=250@6V@1mA
I know this is an old thread, but you need to watch that last letter. A 763Y is 30V, but the 763W is 60V. I see the "W" version more often in audio gear.
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