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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 1st May 2014, 12:29 PM   #281
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Wow, that's big! Thanks man...
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Old 8th May 2014, 08:16 PM   #282
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Originally Posted by boywonder View Post
Tubelab SE with 45's and a 5U4. Output transformers are electra-print and power transformer is an Edcor XPWR131-120.
Where did you get the case? I am in SoCal as well. Thanks!

Abe
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Old 15th May 2014, 12:33 AM   #283
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Think I got it now...
Click the image to open in full size.[/IMG]
Thanks Wintermute!

Last edited by Sabbath2112; 15th May 2014 at 12:35 AM.
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Old 8th July 2014, 05:26 PM   #284
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This thread has been kind of quiet lately, so I thought I'd post some pictures of my Tubelab SE (From the inside!)

I changed my 300B output tubes from Valve Art to Sovtek and liked the difference. However, I monitor the temperature of the filament regulator heatsink (it was always undersized) and the Sovteks must draw more current. The temperature after the tube change was much higher. After about an hour, the heatsink with the Valve Arts would be about 120F. With the Sovteks the temperature would go as high as 135F~140F. The regulator would shut down without an external cooling fan (I already have internal fans).

So, I needed to upgrade my heatsink. Here is a photo of the heatsink before the upgrade. It was a small heatsink scavenged from a PC motherboard Southbridge chip that was bolted on with the original heatsinks from the BOM. My PCB is reverse populated and mounted flush to the top of my case, hence the tight space. This was not enough cooling for any tubes, so shortly after this photo I added another internal fan blowing directly on this heatsink (zip tied in blowing across instead of blowing down onto the fins).
Click the image to open in full size.



Here are the two devices that need cooling. I have removed both heatsinks, and bent the leads as far as I dared.
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This is the new heatsink (also scavenged from an old PC). This one has much better and larger fins. I had to remove the lower left fin to allow clearance for the nearby capacitor.
Click the image to open in full size.



Heatsink is now mounted. I removed more fins to allow the bolts and nuts room.
Click the image to open in full size.



This is the tiny fan (which is also extremely quiet). It is made by Noctua. I was able to fit it directly to the heatsink and bolt it down with self-tapping screws. It is touching the capacitor here b/c I haven't screwed it down yet. In real life it's got about 1/8" clearance.
Click the image to open in full size.



I also changed the rubber feet the amp rests on, which allowed more airflow to my bottom mounted fan. The previous setup only lifted the amp up enough to barely be able to pick it up with fingertips. I added Sorbothene isolation feet which gave an extra 1/2" clearance.
After running for about an hour with the Sovtek tubes, the new heatsinks temperature was around 85~86F! This was a huge improvement, and will hopefully extend the life of the amp.
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Old 8th July 2014, 07:45 PM   #285
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Why not just use a bigger heatsink?
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Old 8th July 2014, 08:33 PM   #286
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My SE build.

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Old 10th July 2014, 05:01 PM   #287
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Originally Posted by Evenharmonics View Post
Why not just use a bigger heatsink?
I should have taken an overview shot. That is physically the biggest heastink I could fit. It's inside my case, which is about 3" tall.


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Originally Posted by mudchute View Post
My SE build.
Looks good! I really like the 2 knobs, are they built or bought?
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Old 15th July 2014, 12:02 PM   #288
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They're bought but used from my SSE. I've got a couple of new thinner knurled items for this one which are more fitting for their position.
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Old 14th August 2014, 02:46 PM   #289
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Very nice - anybody build some SE 45 mono blocks?

Seems like a wonderful setup?

Thanks.
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Old 2nd September 2014, 05:22 AM   #290
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Finally finished my SSE. The sides are maple, the legs and knob are walnut.

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--TWH
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