What are the reasons for ...
- andrew Ivimey
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#16
Those are the swtiches I too use in my home builds Philip.
Philosophers have only interpreted the world - the point, however, is to change it. No it isn't ... maybe we should leave it alone for a while.
- Mike H
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#17
There's no rule that sez you can't have mains suppressors on every amp. Think I have, just about.
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- andrew Ivimey
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#18
Who abides by rules anyway!
Philosophers have only interpreted the world - the point, however, is to change it. No it isn't ... maybe we should leave it alone for a while.
- Paul Barker
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#19
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
- andrew Ivimey
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#20
So I should short the speakers before switching off?
Philosophers have only interpreted the world - the point, however, is to change it. No it isn't ... maybe we should leave it alone for a while.
#21
That is a STARTUP mute.
You are opening a world of work if you want the output relay to operate before the mains goes away. And if you are going to do that, you may as well just use a zero crossing switch. Assuming that is the actual problem. Its just as likely the falling HT is the cause of the problem instead of spikes on switch off.
You are opening a world of work if you want the output relay to operate before the mains goes away. And if you are going to do that, you may as well just use a zero crossing switch. Assuming that is the actual problem. Its just as likely the falling HT is the cause of the problem instead of spikes on switch off.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- andrew Ivimey
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#22
Exactly - I don't see the point of Paul's posting so my comment was not at all serious.
Philosophers have only interpreted the world - the point, however, is to change it. No it isn't ... maybe we should leave it alone for a while.
#23
Though, while that won't save you from the switching transient, it would be fast enough if its the B+ dying.
You need to be more specific about the noise in question
You need to be more specific about the noise in question
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- Mike H
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#24
Just FYI, never had abrupt noises caused by dying HT. Guess it depends how fast? From which you may gather mine is not that fast
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
#25
Yep, if the heaters go before the + then all is generally well.Mike H wrote:Just FYI, never had abrupt noises caused by dying HT. Guess it depends how fast? From which you may gather mine is not that fast
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- andrew Ivimey
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#26
my problem is ... what is the sound a 'spike' makes? an electronic 'click', something that affects only the tweeters (because they are 'fast' enough). I can imagine an instantaneous arc making this sort of noise.
But why should it happen?
It doesn't happen with my GM70 SE amp, for example, and the HT always goes off before the heaters for an obviou reason.
But why should it happen?
It doesn't happen with my GM70 SE amp, for example, and the HT always goes off before the heaters for an obviou reason.
Philosophers have only interpreted the world - the point, however, is to change it. No it isn't ... maybe we should leave it alone for a while.
- Mike H
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#27
You still haven't said what amp it's happening to. Must be something particular about that amp.
Like I said it's an arc or mains transformer being switched off halfway through a half cycle as Nick said, it induces a pulse type signal into the amp, no amount of delayed HT decay or what supply goes off first will make any difference, it's a radio pulse that's picked up and amplified by the amplifer.
Best demonstration is an AM radio and turn on and off your room light switch.
Isn't necessarily confined to treble, you can get quite a powerful click noise.
HTH
Like I said it's an arc or mains transformer being switched off halfway through a half cycle as Nick said, it induces a pulse type signal into the amp, no amount of delayed HT decay or what supply goes off first will make any difference, it's a radio pulse that's picked up and amplified by the amplifer.
Best demonstration is an AM radio and turn on and off your room light switch.
Isn't necessarily confined to treble, you can get quite a powerful click noise.
HTH
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."