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The "Lovely Cube" Headphone Amp (Lehmann Black Cube Linear Clone)
Sep 19, 2010 at 12:35 AM Post #76 of 1,624


Quote:
sunneebear said:
Finally got some time to put the pair of amps together.  Only a mock-up to set the layout for the case.  I am running it with a pair of LM4562 in class A (Purrin
smile.gif
).  This thing sounds sweet.  Balance and SE.  All I have to do now is disassemble it and put the finally touches on the case and maybe some cosmetic work.  Thing is, it sounds so good I can't stop listening.  Next weekend I guess.
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That is freaking-licious-awesome!!!  What DAC are you using?
 
Sep 19, 2010 at 12:39 AM Post #77 of 1,624
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Quote:
dlaloum said:
Very cool - where does one look up how to make a balanced amp?
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You will need a balanced DAC. Get two amp boards. Feed DAC outputs L+ and L- into L and R channels on amp #1. Feed DAC outputs R+ and R- on L and R channels of amp #2. Instead of L, R, Ground on headphones, you wire L and R channel of amp #1 into Left headphone driver, and L and R channel of amp #2 into Right headphone driver.  You just leave ground unused.
 
 
Sep 19, 2010 at 12:46 AM Post #78 of 1,624


Quote:
sunneebear said:
Finally got some time to put the pair of amps together.  Only a mock-up to set the layout for the case.  I am running it with a pair of LM4562 in class A (Purrin
smile.gif
).  This thing sounds sweet.  Balance and SE.  All I have to do now is disassemble it and put the finally touches on the case and maybe some cosmetic work.  Thing is, it sounds so good I can't stop listening.  Next weekend I guess.
Click to expand...


Beat me too it!
smily_headphones1.gif
Looking forward to some pictures!
 
Sep 19, 2010 at 11:09 AM Post #86 of 1,624


Quote:
sunneebear said:
The original pots driven in sequence by a geared counter shaft.
 
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That's a ingenious solution and a great alternative to a pricey 4 gang pot. Did you make that or did you buy it where?
 
Sep 19, 2010 at 3:38 PM Post #88 of 1,624
Thanks for the kind praise guys but I'm pretty sure I'm not the first to do this.   The idea came to me out of necessity.  When I first started DIYing, I could only afford used or surplus parts.  I found two mono Noble pots for dirt cheap and came up with this idea to use them.
 
Sep 24, 2010 at 2:48 AM Post #90 of 1,624
Finally put the finishing touches on my balance Lovely Cube.  It's a cheap case but hey it works.
 

 
The completed layout.  Sorry for the blurry phone pictures.
 

 
I am running it with the Burson dual op amps.  I also put larger heat sinks in the two transistors in front of the two large capacitors because they get pretty hot.  Is this normal for this amp?  Even with the large heat sinks the case gets pretty hot when I put the cover on.  I will be putting holes or a grill of some sort on the cover when I get a chance.  I am pretty sure that the amount of heat generated is acceptable but I don't like hot amps so I will try to remedy this issue.
 

 
Anyone with this amp or the M-Stage think it runs kind of hot?
 
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