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Posted (edited)
3 minutes ago, Addicted to music said:


 

This is what you said: 

Yes it wasn’t that long ago…. I remember. 
What are you inferring? No where did I state it was for speaker protection.

If you mean “like stated above” that refers to the posts earlier regarding the Chinese protection boards. Not my own post regarding a Polish in rush limiter.

 

Some of you blokes are too eager to jump a thread and post your lengthy replies without reading what is actually being said 😉

 

Edited by Jakeyb77_Redux

Posted
8 minutes ago, Jakeyb77_Redux said:

 

 

Some of you blokes are too eager to jump a thread and post your lengthy replies without reading what is actually being said 😉

 


You mean to jump a post in a thread.  You are right,  I looked and read your post and then looked at the pics in that post…… Didn’t give a Schitt about the above or previous posts, that’s why you need to be very specific.   Because reading the initial sentence directed me to the pics in that post…..🤦‍♂️

Posted
4 hours ago, Richard Tremain said:

Regarding reliability i have a Naim Pre/Power and a original Vallhalla Board both been mains connected 24/7 for 40yrs anyone beat that?


Naim do make some reliable stuff,  had all the 80s Naim gear apart, inspected and tested them, solidly built which is part of the equation for reliability.   Saw them use CAD to minimised the the circuit board tracings to a minimum with the same circuit and parts, boy the difference in SQ just by doing that really opened up my way of thinking.   1st time a commercial product that I saw routed wires in such a neat systematic way that I though most electronic company can learn from.  
However that said, I’ve built a kit Mosfet Amp that drive 1.8ohm ribbons  from mid 80s till this day, and it still works without a failure.   Electronics can be super reliable provided you don’t exceed the specifications and you operate them at optimal.  
Failure is not just due to DIY built quality,  components can also fail due to unexpected production errors, a typical example is the Thermaltrak devices from Onsemi where a major production batch was found to have faulty thermistors diodes that provided incorrect thermal levels.   The main point of Thermaltrak is to have real live thermal info at the die level!    By the time they discovered that thousands of these transistors where already operating in peoples homes.    One amp manufacture sends 2 amplifier modules to correct the issue free of charge, regardless of where the owner is and without hesitation on there costs.    By doing this they know that no one has mess with it,  it’s all setup in house and all you have to do is put it in place.

Posted

Simple d.c, detecting circuit that drops out a relay is IME and IMO far better than a fuse or nothing at all.  Whilst some may argue that a relay contact between the amplifier output and the speaker terminals "ruins the SQ", a blown speaker is really going to affect the SQ and ruin your day.  :(   With regard to the comment about relay contacts welding together or arcing, there are very simple circuit design techniques that minimise this.  In addition, a plug in relay is easy to replace in the event this happens.

 

The fact that some amplifiers with d.c. coupled amplifiers are on the market without any speaker protection is often a matter of cost cutting.  Yes, it's possible to design a power amplifier to provide such protection without the signal passing through a relay contact but such circuits are somewhat sophisticated, complex and costly.  Hence the reluctance of some manufacturers to integrate them into their designs.  Any part of a d.c. coupled power amp can fail and the results (without some protection circuitry) can be catastrophic as has been painfully illustrated in this thread.

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Posted
On 17/06/2023 at 6:56 PM, mbz said:

 Possibly the unit uses a relay, you may hear a faint relay click 3-8 seconds after power on or at speaker selection on some makes. You are probably ok but would be nice to know for sure.

 

Oh yes for sure it uses a relay, can hear it click in after a few secs🙏

I hadn't really associated that with protection against excess output, mainly coz I'd never thought about it at all hehe.

 

Thank you for the kind response.

 

 

  • Like 2
Posted
On 17/06/2023 at 2:39 PM, tripitaka said:

Definitely food for thought👍

 

I'm embarrassed to say I don't even know if my monoblocks have a cutout circuit and my speakers are way more than $10000.  Hmmm!

What amp are you using ? Look at the back for fuses A) power inlet B ) Speakers ? or just take a photo put it up on here. Also do you have a multi meter ? The amp in question here had 37vdc at idle it would guarantee to fry drivers , Most amps have protection circuits of some kind but it might be worth checking your amp 

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