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Old 27th March 2013, 10:49 PM   #1001
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Quote:
Originally Posted by SoIL4x4 View Post
I bought my k71-4 caps from valtek. The shipping was reasonable and fast to the US. I bought two sets and they were very closely matched. The set that I am using for the FE build measured .999uf and. 998uf. They measured the same after soldering too I am hoping to have some listening impressions soon.
Soil,

Tell us about the mounting system for the K71s. Rods?

Jac
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Old 27th March 2013, 10:52 PM   #1002
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2% is good ? He has lot of 4 with 5% though.
By the way, if you have a question or want something a little different from what is on offer, just email valtek. For example, if he had 4 of the 2% K71-4s and that's what you wanted, he would quote you a price. Also, he is fairly smart about Russian caps and the differences, so ask away.

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Old 27th March 2013, 11:06 PM   #1003
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Jac thx for tips
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Old 28th March 2013, 02:21 AM   #1004
SoIL4x4 is offline SoIL4x4  United States
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Jac, my original plan for the enclosure had the k71s in the position that they occupy, but that created a mounting issue. I wanted to have a somewhat modular design that would easily allow swapping in the future if the opportunity arose. My original plan was to "machine" some plate to make an unnecessarily complicated part to mount the caps, but I went a different direction. I decided to browse my local hardware store (the type that has a "real" selection of fasteners) and see if I could come up with a solution. Aside from the mounting plates that I made from 1/8" aluminum (with a template) the rest of the construction that you see in the pic is available any time at the hardware store. These consist mainly of aluminum tube, threaded internally, an aluminum spacer of a larger diameter, a copper washer and a few stainless fasteners.

I wanted to easily be able to duplicate these if I changed caps, and be able to easily remove them. I saved the template for the mounting plates if the need arose. In the attached pic you can see how these are removable as a unit without disrupting too much internally.

I am only hours from being finished, and I could have been today.......but it was nice out so I hung some new lighting in my garage/shop......soon

P.s. the crayon on the table is not part of the design, it is an early work of my four year old and the envy of my 17 month old.
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Old 28th March 2013, 10:38 PM   #1005
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Originally Posted by SoIL4x4 View Post
.......Aside from the mounting plates that I made from 1/8" aluminum (with a template) the rest of the construction that you see in the pic is available any time at the hardware store.......

I am only hours from being finished, and I could have been today.......but it was nice out so I hung some new lighting in my garage/shop......soon
Will,

Beautiful work!! And a really interesting way of approaching it that I've never seen. Of course, there is lots I haven't seen, but still great. Isn't it wonderful what a good hardware store can do for you?

Sometimes, the weather just calls to you. Congrats on the amp build. I can't wait to see the finished pictures.

Jac
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Old 28th March 2013, 11:07 PM   #1006
bcmbob is offline bcmbob  United States
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Don't get mad, yours gave me a crook in the neck.

Really like the originality and the modular approach. Impressed that you are taking your time to develop just what you want
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Old 29th March 2013, 02:47 AM   #1007
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I like the way the caps mounting looks, but I can't imagine it does anything beneficial to sonics. I hope this isn't too harsh, but unless those rods are supported at both ends, they'll probably vibrate, which is the worst thing you can do to a cap. I think there should be some sort of damping material between the metal caps casing and the metal rods. It appears the input wiring is excessively long and routed near power supply wiring and circuits, which might contribute to noise despite the beautiful twisting. I'm not really into sharp 90 degree bends and perfectly straight lines of wire, either.

It does look really cool, though, if you plan to sit and look at your amp's internals. There is something to be said for orderly layout, but it should never be at the expense of sonics. I don't know if this construction will contribute to any degradation of signal, but it will almost certainly not yield improvements. Sorry for being so negative, but I don't think other builders should be inspired by this layout only because of its appearance.

Peace,
Tom E
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Old 29th March 2013, 02:57 AM   #1008
SoIL4x4 is offline SoIL4x4  United States
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Thanks guys, this has been a fun build. I did manage to finish the wiring of one channel tonite and will hopefully finish the other tommorow. I will have some sonic feedback soon.

I started out with a solid plan for the entire build, but as all projects go I made improvements as I went. With each improvement I made, I thought of another improvement that I could make that went into the next time column. hopefully all of these "design" choices dont negatively affect the sonic qualities of this amp...we will see.

Thanks for the better pose Bob, sorry about your neck.....
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Old 29th March 2013, 03:15 AM   #1009
SoIL4x4 is offline SoIL4x4  United States
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Tom, I appreciate your comments as some of them play to my questions about how this amp will sound. The mounting of the caps is solid and will not be any more prone to vibration in this setup then if they were mounted to the pcb. As for the wiring, the length of the wire is only a small distance greater then if the crows path was taken. It is difficult to route the signal wiring away from power wiring in this amp because of the board layout. other builders seem to have had success. I did try to keep as much ac shielded from the inside of the amp.

why are you not into straight wire and 90 degree bends? I know 90 degree bends are not recomended on pcbs, but why not here?
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Old 29th March 2013, 07:48 AM   #1010
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Gents, how do you rate Nichicon KG Gold from here ?

Pricewise would be midway between basic Manasonic and Mundorf Mlythic
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