Yamaha B-2 crackling noise.
- Thread starter Margus.S
- Start date
you have a slow discharging capacitor (C223) or a "leaky" transistor. See Zaibatsu's diagram.
Did you replace C223? If yes, check polarity!!
Something keeps TR216 biased post shut-down or TR216 is faulty.
I would replace them to be certain.
Margus.S
Member
C223 allready changed,but minute ago I checked it and replaced it second time,but nothing changed with crackling noise.
Margus.S
Member
Not yet,tomorrow maybe will do.
Margus.S
Member
TR216 working B=108 Uf=657
TR215 working B=215 Uf=697
Margus.S
Member
I have transistor tester and multimeter.
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I read your problem description again and it's not clear.
Do you mean that *after* you turn the unit off, you can still hear something from your speakers?
Or do you mean there's a crackling noise while the amp is on and you're playing music?
What happens if you are playing music (with a source/input attached) and turn the amp off while it's still playing - does sound continue to come from the speakers for a short time after you turn it off, or does it cut out instantly?
Also, what's the delay time before the relay clicks, when you turn the amp on?
Do you mean that *after* you turn the unit off, you can still hear something from your speakers?
Or do you mean there's a crackling noise while the amp is on and you're playing music?
What happens if you are playing music (with a source/input attached) and turn the amp off while it's still playing - does sound continue to come from the speakers for a short time after you turn it off, or does it cut out instantly?
Also, what's the delay time before the relay clicks, when you turn the amp on?
Margus.S
Member
Music playing normal,but in this moment,when I turn B-2 off,then I hear from speakers 1 second impulse(crackling noise...),this is only that moment,when relay cut speakers off instantly.
When I turn B-2 on,then relay clicks after 3 second.
So are you saying the relay stays engaged for 1 second *after* you turn off the power switch?
I'm guessing you have the relay cover removed and can watch the contacts as you turn the power off?
Just be aware that occasionally, transistors can measure fine on the tester (both the mini transistor tester and diode mode on multimeter) and be problematic under load. I agree with rottalpha, it's a good idea to try replacing these just to be sure.
Can you list the model of transistor used for TR216, 217, 218?
I'm guessing you have the relay cover removed and can watch the contacts as you turn the power off?
Just be aware that occasionally, transistors can measure fine on the tester (both the mini transistor tester and diode mode on multimeter) and be problematic under load. I agree with rottalpha, it's a good idea to try replacing these just to be sure.
Can you list the model of transistor used for TR216, 217, 218?
Margus.S
Member
Relay cuts instantly off,but in this moment I hear one second or less bad impulse(crack) of my speakers.
TR216 2sc1166
TR217 2sa842
TR218 2sa842
Whats the alternatives recommendation of these replacing?
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If the relay cuts off instantly (with power switch off) - I don't think you actually have a problem here.
It's normal to hear a brief crack when the switch is turned off on any amp.
If you want to try substituting the transistors anyway though, you can use:
2SC1166 --> KSC2690
2SA842 --> KSA992
Keep in mind KSC2690 is a higher power device (w/ different package), be careful with its orientation. Someone may have a better substitute, but this is often suggested as a relay driver since 1166 can be a bit under-specced for the application.
I think it would be wise to wait for someone like @rottalpha to confirm this is OK.
Best wishes
It's normal to hear a brief crack when the switch is turned off on any amp.
If you want to try substituting the transistors anyway though, you can use:
2SC1166 --> KSC2690
2SA842 --> KSA992
Keep in mind KSC2690 is a higher power device (w/ different package), be careful with its orientation. Someone may have a better substitute, but this is often suggested as a relay driver since 1166 can be a bit under-specced for the application.
I think it would be wise to wait for someone like @rottalpha to confirm this is OK.
Best wishes
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Margus.S
Member
I have service manual,there is writed TR217,TR218 must be 2SA763WL 4or5 ,but in my B-2 inside these 2SA842 ,maybe they wrong transistors?
Margus.S
Member
Tomorrow I will buy transistors,then will see,they resolve problem or not.
if your relay disconects instantly, then there is only a piece of wire between the relay and the speakers...nothing that would generate the crackling.
TR217,218 --> KSA1015
you could use KSA992. The KSA1015 has a higher collector current (Ic 150mA vs 50mA)
TR216 - KSC2690 works fine. There are other alternatives but this one will do just fine and it is way better for the job than the original driver.
Like he said!
