D-Moll getting hot?

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kahawe

kahawe

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I recently switched to TWO 2x12 8Ohm cabs, plugged them both into the 4Ohm outputs and after a couple of hours of playing at moderate levels I noted the amp is getting quite hot, especially the backplate that is right next to the 4 power tubes is almost too hot to touch. Anyone else notice that, is that normal? The amp is standing free on top of the cab, a good 15cm between backplate and the concrete wall to allow air circulation, nothing on top. Nothing smells burnt, I am just wondering. It's running on stock tubes.

Maybe I am just being paranoid? I had the impression that it has gotten hotter after I switched to the two cabs on the 4Ohm outputs, first it was just one 8Ohms into the 8Ohm out, of course.
 
My D-Moll gets hot enough after some time, albeit from my experience with other heads not to the extent for me to be alarmed. Yes the backplate next to the tubes gets quite warm, but not hot.
However I have the traditional D metal plates, which provides good air circulation, through the front and back.
Which version do you have?..
 
i always ran a clip-on fan for my VH4 & Herbert. They got plenty hot and the extra air circulation helped. $15 well spent IMHO. :thumbsup:
 
I was wondering the same thing. Running my Herbert at 4ohms and its really really hot. Not "untouchable" hot, but still pretty hot. Guess I should start looking for a fan too.
 
The topsides of the chassis is all transformer. Both the OT and PT are taller than the tubes and the power tubes sit between them - and there's not a lot of overhead clearance, nor is there a top vent.

But, I wouldn't worry too much about it, although a small fan certainly won't hurt though, as with any amp - if it makes you feel better. I left mine on for about 18 hours (on run) just to get the tubes seated and burned in. It wasn't hot enough to peel the face plates off yet and nothing negative arose.
 
My Einstein gets alarming warm like on the verge of hot but that's after a 3 set 4 hour show. Good tone is hot and heavy! :rock:
 
steve_k":3ntriuje said:
The topsides of the chassis is all transformer. Both the OT and PT are taller than the tubes and the power tubes sit between them - and there's not a lot of overhead clearance, nor is there a top vent.

But, I wouldn't worry too much about it, although a small fan certainly won't hurt though, as with any amp - if it makes you feel better. I left mine on for about 18 hours (on run) just to get the tubes seated and burned in. It wasn't hot enough to peel the face plates off yet and nothing negative arose.
Click to expand...

I am running mine on 16 ohm though. With a 4 ohm equivalent and less impedance, you are certainly working the tubes harder though and it may have an impact on the generated heat. But, I am sure Herr Diezel has tested them to the hilt and if it needed a fan or a bigger box, he would have done so.

Steve
 
steve_k":mxnk75yy said:
With a 4 ohm equivalent and less impedance, you are certainly working the tubes harder though and it may have an impact on the generated heat.
Click to expand...
To put minds at ease and discourage people from swapping cabs to keep their amp cool, I point out that this is a common misconception, actually given that the correct cab impedance is connected to the right socket (4 to 4, 8 to 8 etc) the tubes produce exactly the same energy and therefore the same heat. The difference is how the OT converts this same energy to suit the different cabs.
 
OK, thanks guys! You know how it is with nice new gear, you get all paranoid... :D
 
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