Salas hotrodded blue DCB1 build - Page 239 - diyAudio
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Old 14th November 2012, 03:31 PM   #2381
Salas is offline Salas  Greece
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Its how those cement resistor boxes are rated, nothing to worry about yet. With 15% load factor they can easily rise 40-45C above ambient. 70C case temp you got its no strange if there was 25C to 30C around them. At 70C they are usually still 100% rated. They break at about 250C+.
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Old 15th November 2012, 08:30 PM   #2382
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I just got a big change by removing the transformer from the metal plate base and attaching it on a piece of wood (wenge).
The difference is most evident in highs. Cymbals and other brass seem much clearer, more natural and focused. Same with the snare drum bursts and bass drum kicks. Plus a vague feeling that highs were out of phase is now mostly gone. Downside is that sometimes things can feel a bit muddy.
The mechanical hum from the trafo is also barely audible now.

The difference is big even with the wood on top of the metal plate. I still have to decide what to do with the rest of the psu, so short trafo cables made me keep it really close.
Current thoughts are to keep only trafo out of the box with really short cables with XLR socket/plug to pass the secondaries in the chassis.
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Old 16th November 2012, 05:11 PM   #2383
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I was wondering if this version would be capable of driving headphones? I currently have some easy to drive Shure headphones, but am considering an upgrade to Hifiman HE-500, which are hard to drive. Will this buffer be able to handle the Hifiman load?
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Old 16th November 2012, 05:20 PM   #2384
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It only runs 7-8mA Jfets, no chance for any phones really. Sorry.
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Old 16th November 2012, 07:45 PM   #2385
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Guys what resistors do you propose trying in the CCS?
The final value for me is 1R giving ~1,1A.
Resistors I am considering are 5W mills, 5w duelunds and MP Caddock

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Old 16th November 2012, 07:46 PM   #2386
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IMHO, Caddocks
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Old 16th November 2012, 08:06 PM   #2387
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Could you please elaborate a bit more?
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Old 16th November 2012, 08:15 PM   #2388
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Quote:
Originally Posted by dimkasta View Post
Could you please elaborate a bit more?
I cant' say nothing for Duelunds but I've tried in my Mez, for CCS setting resistors: Mills, Caddocks and plain MOX.

The resistor that sounded fuller, more detailed and musical was the Caddock.

The MOX is a bit harsh but detailed, the Mills,sweet but a bit dull with loss of detail.

In a similar app (the CCS setting resistor of my My_Ref variant PS) Caddock MP were better than any audio grade and industrial resistor I've tried (KOA SPR, PRPs, carbon film, metal film, tantalum film, etc.)
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Old 16th November 2012, 08:20 PM   #2389
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That s cool Are you talking about MP915 series?
And they are really cheaper than the rest too Plus they should be easy to mount on a heatsink themselves.
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Old 16th November 2012, 08:32 PM   #2390
Salas is offline Salas  Greece
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Dario, like this MP930 one I used in the photo?
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