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In the Forum: Melquiades Amplifier
In the Thread: Planning my DSET
Post Subject: Heating is an issue...Posted by anthony on: 8/4/2015
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 Romy the Cat wrote:
Generally I like it but I have some concerns, whatever rubber feet and decompiles you will be using you will not defeat the vibration if you have a few transformers and a few 500A input chose sitting at the bottom. You will take a statoscope and you will clearly have the vibration on the tube floor. Well, you will have noise on the tube floor but how will affect sound is very hard to say. A common sense would suggest that you should not have any vibration in there, and in particularly because you use very fast and relatedly microphoneic tubes (when they cold) in driver stage. But in reality it is not so simple and I have seen when vibrated control unit sounding more stage then fully isolated. Still, I would go for fully isolated control unit (tube floor). 
 


Yes, I considered running an separate isolation platform for the amplifier section but could not think of an easy way to incorporate it into the design as it stands.  Thinking about the weight of these things it will probably be a good thing to be able to break them in two to have some chance of shifting them by hand so I will revisit the design.  
The isolation platforms are spring mounted.  The springs will be loaded by the components that sit on them and the weight of the platform itself so that when you give it a nudge the unit slowly oscillates at a very low frequency, say a couple of hertz.  I dare say that the idea is not so different to the Silent Running Audio stuff that you use.  The stethoscope is a very good idea.  Much more simple than the accelerometer that I was considering to sort this stuff out.

 Romy the Cat wrote:
  
The biggest concern that I have if you have a single chasses with PS at the bottom is that your caps at the mid floor is that your caps, like the rest of your components inside will be greatly over heated. The transformer and choke will be getting hot and your entire amp will be a basic chimney with hit-sensitive caps in the middle. I think it is one more argument to put PS to a separate chasses. You still cat stack the PS and control unit one above another, in the way how I did it: 
  
http://www.goodsoundclub.com/Forums/ShowPost.aspx?PageIndex=1&postID=2715#2715 
  
…but this way you might have more effective heat and vibration decupling. You will be going over the hell of dealing with connecting cables but you might outsource it and order the connectors and cables to be made for you.


I was going to seal off the power supply section at that thick platform that is about halfway up the tower and either chimney or fan force warm air out the sides so that it does not affect the amplifier section.  This will keep the warm air from the internals of the amplifier section.

 Romy the Cat wrote:

 anthony wrote:
Not sure why the images are not showing up properly.  Romy?

Do not use “#” in the picture names and the will be shown

Understood.  Thanks Romy.

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