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Old 20th April 2004, 12:41 AM   #11
EC8010 is offline EC8010  United Kingdom
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You lucky people! I count myself lucky to have a Hobbymat MD65 lathe and Chinese copy of the little Emco mill. Toys.
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The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
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Old 20th April 2004, 02:59 AM   #12
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Quote:
Originally posted by Magura
I can only agree with you about the fact that a well educated toolmaker is having an easy time making the stuff that most will have to leave for their wildest dreams. I have access to a fully equiped modern machine workshop as well, so we may have some fun ahead of us. In a while Ill start a thread about my Pass Zen V7 project. I have machined most of the parts by now (including the heatsinks), and im just waiting for the day Im getting excited to go out and buy a digi camera. The thread will not be interesting without the pics.

Magura

What other parts have you machined other than the heatsinks Magura? If you machined the inputs and outputs what steel did you use to avoid rusting? I'm very interested in seeing the blueprints you have available for the heatsinks, their look can really make an amp look sweet.
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Old 21st April 2004, 02:25 PM   #13
Magura is offline Magura  Denmark
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Im working on the box itself. to be cast and machined of aluminium. Wall thickness 20mm. Box will be cylindrical and heatsinks mounted around it. Besides that ive machined a few heatspreaders from copper, the bolts are to be machined still for the mounting of the heatsinks..and so are the nuts for the same.
Then Ive machined a couple of mounting brachets for the power supply inductors and are to machine brackets for the 80mH inductors as well, all from aluminium.

Plus the usual buttons and so forth.

I guess the most interesting project right now is the 40 step rotary switch for the attenuators. I just made the tool for forging the silver contacts. Needed a tool since i need several hundreds of them for two balanced attenuators. The final touch up on the switches will be step motor drive.

Magura
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Old 21st April 2004, 06:14 PM   #14
Magura is offline Magura  Denmark
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Im generally short of blueprints, as most of it have been made on machines with Heidenhain operative system. With Heidenhain I usually program manually directly in the OS. Its more of a challenge and in many cases also faster.

Magura
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Old 22nd April 2004, 03:02 PM   #15
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Hi Magura,

That case sounds like its going to be really nice. I've seen an amp with a round enclosure and it was one of the nicest things I've ever seen. Good to see you build everything you can makes the project more personal when you can build even the brackets.
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Old 22nd April 2004, 11:51 PM   #16
Magura is offline Magura  Denmark
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Well, to make the whole thing myself is part of the fun. It makes the whole thing exactly the way we want it. If that should not be the case, at least I know whom to blame

It naturally also is a matter of quality, perfection is either not an option or very expensive. So Ive chosen to make pretty much everything myself. Its simply too time consuming as well to try to find the specific parts that we want (we= me and the Mrs., she is participating in this as well), then better just go and make the respective parts, at least you know what you get.


Magura
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Old 23rd April 2004, 12:55 AM   #17
Magura is offline Magura  Denmark
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Since I cant reply to your mail...the adress dosnt work...here is the reply:

Hi

For people like us the ultimate choise of amp would be Zen V7. Thats the only DIY amp where we can really get a benefit over the common DIY'er.

Most of the attempts to make such have been ending up pretty bad though, cause people dont have the machine workshop needed to make something that powerfull.



Cheers

Magura
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Old 24th April 2004, 04:09 AM   #18
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Quote:
Originally posted by Magura
Zen V7
I finally read that paper... looking at the very last schematic makes me think a pair of tubes might replace the mosfets... a single stage forced symmetry (Allen Wright) crossed with Super symmetry (Nelson Pass)

EC8010... could it be made to work?

I've attached the map i refer to from Nelson Pass' Zen V7 article on the PassDIY site.

dave
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File Type: gif zen7.gif (14.2 KB, 58 views)
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Old 24th April 2004, 10:13 AM   #19
Magura is offline Magura  Denmark
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Hmm, I guess Dave got hold of the wrong map??

To me it seems like the the ZV7 for esl??

Magura
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Old 24th April 2004, 06:58 PM   #20
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Quote:
Originally posted by Magura
I guess Dave got hold of the wrong map??

To me it seems like the the ZV7 for esl??
No that is the one i meant... the ESL OPT could easily be replaced by a PP OPT or perhaps even a pr of SE OPTs (which are designed to handle the DC)... except for the super symmetry i've already skirted around the SE idea...

http://www.diyaudio.com/forums/showt...5694#post55694

Take the SS feedback out, retool the CCS as required, adjust the windings on the OPT, replace the 2 MOSFETS with power tubes and you've got a single stage PP amp. I've not yet got enuff handle on feedback to get my head around that...

dave
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