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Old 10th December 2012, 03:32 PM   #3241
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Quote:
Originally Posted by Tea-Bag View Post
Yes, @ 120mm from screw hole of power Fets.
lhquam, permaneder and Tea-Bag: Which chassis(s) in our DIYAudio Store will accept your PCBs with no additional modification?
Best regards.
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Old 10th December 2012, 03:42 PM   #3242
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Originally Posted by Antoinel View Post
lhquam, permaneder and Tea-Bag: Which chassis(s) in our DIYAudio Store will accept your PCBs with no additional modification?
Best regards.
I do not understand your question. Just drill holes into the heatsinks and cut threads, e.g. M3 = 3mm, or any " equivalent
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Old 10th December 2012, 03:44 PM   #3243
6L6 is offline 6L6  United States
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Quote:
Originally Posted by permaneder View Post
I do not understand your question. Just drill holes into the heatsinks and cut threads, e.g. M3 = 3mm, or any " equivalent
What he is asking is if your PCB will fit the heatsinks with pre-drilled and tapped holes - known as the Universal Mounting Spec.

It can be found here -- http://www.diyaudio.com/forums/image...ation-v2.1.pdf
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Old 10th December 2012, 04:24 PM   #3244
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by his answer I think we can probably assume no =)
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Old 10th December 2012, 04:31 PM   #3245
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by his answer I think we can probably assume no =)
No means yes
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Old 10th December 2012, 04:34 PM   #3246
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The UMS drill spacing between FETs is generally @ 40mm holes, so it should fit fine according to the printout of the spec. We made care to make sure it can fit. The leads on the R100's are longer, and will fit with a little more wiggle room than the IRF240.
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Old 10th December 2012, 04:55 PM   #3247
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Thank you all for responding to the "chassis" question. Best regards.
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Old 10th December 2012, 11:55 PM   #3248
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OK Guys - I think I am being stupid here. I have been varying R13,R14 with fixed resistors in the range of .0125 to .1 ohms. I think I am getting a feel of what changes can happen and what I like.

Then I think about paralleling a 10 ohm pot with a .05 ohm fixed resistor and using that to tune in system. Doing the parallel resistor calculation with pot at low extreme (0 ohms) parallel combo should be zero at high extreme (10 ohms) it should be .049 ohms . Now parallel 1 ohm with .05 and you get .047. The remaining numbers (3-9 ohms) are between .047 and .049. Doesn't that say that the major variation in R13 and R14 (paralleled) is in the first few turns of a 15 to 20 turn pot and wouldn't it be better to just use fixed resistors or fixed resistors with a rotary switch ???

What am I missing?

Best

Bob
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Old 11th December 2012, 12:05 AM   #3249
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The 10R pot is having minimal effect because of relative size. Perhaps smaller pot or just get multiple value rs and play around.
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Old 11th December 2012, 12:12 AM   #3250
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The 10R pot is having minimal effect because of relative size. Perhaps smaller pot or just get multiple value rs and play around.

That's exactly what I am thinking - maybe my brain is still working
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