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Just wanted to share some pictures of my newest build. It will be ready to go some time in the summer as I have to buy the tubes and the 300B XLS are very expensive. Also the interstage trannys are costly as well. I had the other parts from collecting about two years ago. This has been a project in waiting. My friend Danlaudionut drew up the schematic and Chip647 was influential on parts and layout. Also Kevin Kennedy helped a great deal as well. And of course Kevin Carter from K and K will get the interstage order. Thanks to all for all the help but there is still a bit of a ways to go and it'll have to wait. Money right now is not available for toys. The front end tubes are a 6SN7 and a 6L6 for each monoblock. The power supply for each amp chassis is a single power supply on a separate chassis so the total chassis are four. It also has a separate chassis for the filament supply going to the Rod Coleman regulator in the amp chassis. Lots of chassis but room is at a premium.
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The top of that chassis is pretty thick 1/8 alu plate . Did you use punches to make the socket holes ? How did that go? I got the same chassis and slowly getting into making holes for my PSE project.
Regards, W
I really like the copper ground buss, care to share the topology?
Dan said it was good with him to show the schematic so here it is. I did the filament supply a bit differently from Dan's drawing as per what Rod Coleman suggested and being that I used his regulator for the 300B I did as he suggested. It probably accomplished the same thing using Dan's idea there.
Just note that the chokes(BAC 80) and output trannys(EXO-050) cost me almost $1400 two years ago.
With all the parts and chassis along with the tubes(especially the 300B's) this amp is not going to be cheap. With everything I have accomplished without labor I am into this thing for over $2000 in parts alone and I'm not done. But that's with the power supply chassis included. I will post a picture or two of it soon.
Hello Paul:
I just double checked our pricing on BAC-80's and EXO-050's and I'm coming up with less than $700 total. Unless you got optional nickel core materials but your photo seems to show non-nickel cores on the 050's and the plate chokes are not available in nickel.
Our price list can be found at www.magnequest.us
Builder of MagneQuest & Peerless transformers since 1989
This is Danlaudionut's schematic and design. Whether it is copied from another or he thought it up in his head I wouldn't share someone else's work without his say so. If he gives the OK then I will.
I thought the way I ran the copper ground buss was cool when I first did it in another project. It was a success there and I used it again since with success so I thought I'd try it on this. If I have issues with the amp once it's fired up I am hoping it's not because of the ground buss.
I assume that's copper plumbing supply tubing. I always wanted to try that stuff as "speaker wire" (connection between speaker and amplifier). It might be excellent, but I don't know about he quality of the copper used.
I am in the plumbing business sort of speak. I install and service underground sprinkler systems so plumbing is part of my job. I know the copper has to meet a standard as far a strength but I am not all that sure about the quality of the copper itself. I just know it has to be able to be sweated to(soldered). Other than that who knows but as for a ground buss it has always been fine. It measures "0" ohms from end to end.
If your amplifiers are reasonably close to your speakers, you might want to try it as speaker wire. If you do, let us know. I actually think it might be excellent. The cool thing is that it is stiff enough to travel in mid-air from amp to speaker, so no danger of fouling AC cords, etc.
I was never a believer of all that about the speaker wires and IC's being elevated. Maybe I'm off base but there is nothing out there to justify it as being credible. But if you hear a difference then you do. Who am I to say. I tried things with that theory and never heard any difference whatsoever.
I was not referring to any virtue or lack of same associated with elevating wires above the floor per se. I was referring to the very real issue that sometimes pertains if your amplifiers are close to your speakers, wherein the AC cords feeding your amplifiers can run close to your input ICs and/or the output speaker wires. I think we all can agree it is not best practice to have an AC cord running parallel in close proximity to either an IC or speaker wire.
I totally agree with you on the other issue; I have never been able to hear a difference, either. A close friend of mine who buys into almost any tweak and who owns some expensive platforms designed to elevate his ICs off the floor, sheepishly admitted to me that he could hear no difference in his system, with vs without the elevators.
DanL
Is that copper pipe for a ground bus ?
Al
Yes it is! It worked great on a couple of other projects I did. Might be a bit overkill but I like to keep things as neat as possible and wire(even thick gauge) tends to look sloppy.
Looks like you're off to a good start. I'm curious about the chassis construction. Are those rivet heads in the top?
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Buy Chinese. Bury freedom.
The screws are a 6/32 hex head with a bevel so the screw sits flat with the chassis top and bottom. These chassis with all the hardware that can be bought is made to resemble the Audio Research chassis. If you do a search on Ebay in the electronics chassis section the seller is there all the time. I think they cost about $130 each. I bought a bunch of them from him a while back and finally decided to use them. Only drawback that I have found is that they are only 1.5 inches deep. Maybe 2 inches at the most. Not a lot of room to fit film caps. What I did was make extensions to the bottom so I can fit larger caps and the such. That worked out well!
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