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Old 9th July 2009, 08:24 AM   #1981
massimo is offline massimo  Italy
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Roy, what did you use to drawn your pcb?
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Old 9th July 2009, 08:31 AM   #1982
JEP is offline JEP  Netherlands
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I used circad from omniglyph, its freeware or shareware and easy to use.
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Old 9th July 2009, 08:48 AM   #1983
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nice !

I see a carbon fiber ,interesting stuff for box ,any one know how work for emi-rfi ??

delrin is interesting too but there is formaldehyde
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Old 9th July 2009, 09:03 AM   #1984
JEP is offline JEP  Netherlands
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Thanks nico,

what I know about is that iron is the bestway to shield. An engineer onces to me you need 10mm of aluminium to have the same shielding as from 1mm iron.

I did the carbon just for the looks, its was an leftover from another project
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Old 9th July 2009, 09:47 AM   #1985
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yes , is very good shield for 50/60hz but impossible to use with home tools
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Old 9th July 2009, 10:27 AM   #1986
JEP is offline JEP  Netherlands
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Hi Salas,


What I wanted to ask and all the time forgot to do is:

I know would it be possible to make your design suitable for different equalizationcurves. like for instance the zanden phonopre.

What I read about that in reviews got me really interrested.

I cannot design something like that otherwise I would have.
But you mostlikely can but are you willing to?

greetings roy
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Old 9th July 2009, 11:31 AM   #1987
Salas is online now Salas  Greece
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Those are historic curves, for pre riaa vinyl, mainly mono, 78rpm etc. They are made upon trial and error by using such collectibles, and there is trim slack, because they can be all over the place. I don't have even one such record, and I am not planning to cater for such curves. They would only introduce switching and augment the layout for no use. Now if I would sell chromium stuff with 3 Philips 6922s at $20k I would try to market some peculiarity too.

Back to your build...Your shunt reg sinks size will not be that efficient with 6R8 R1, use a 10R 1W instead.
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Old 9th July 2009, 02:26 PM   #1988
disco is offline disco  Netherlands
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Quote:
Originally posted by roy algra
...
Looks nice jaap, did the pieces of aluminium came out of a plane?

greetings roy
Howdie Roy,

Almost. The apparatus was intentended for radio activity measurements and contained nice parts. Baco sells it.

Point of (positive) critisisme on your PCB. The routing is quite long so you end up with a nice antenna. Short masterclass

Beautiful shape you created with your horns. Wish I could convince my wife ....

The Simplistic has improved on the bass notes. It's not yet on par with my tubed PhonoDude as highs are not yet well developed but -hey- we're only some 20 hours further

Will investigate different loading points too. Thanks for the link Salas.
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Old 9th July 2009, 02:50 PM   #1989
Salas is online now Salas  Greece
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Disco:
For MM, you must know that the capacitive loading is the same in total between phonos before comparing. My Valve Itch is Mu follower like the Dude and has enough Miller where the Simplistic is cascode and has minimum of its own. I know they load differently. I also know that they give the same tonal balance with equal loads. The burn in will give enough material related relaxation but if you don't actually tune the MMs with a test record and FFT on the various circuits you have, you will never know for sure. Simplest way is to add 50-100pF and turn a 100k trimmer instead of Rload. Where you find balance by ear, measure and replace with closest fixed resistor of choice.

Roy:
On the subject of 881s (It used to be my first ''good'' cart back in the early 80's) better use the brush and add 1gram tracking force on top of what you use, it will be offset by the brush, and add a gram on the antiskating too. It actually stabilizes the tonearm dynamically on top of sucking dust eletrostatically and that is a good thing. That was its main function although Stanton did not want to reveal its tech back then and the press was backfiring with assumptions. Also its tip is a Japanese made nude Shibata and quite sensitive to VTA.
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Old 9th July 2009, 04:00 PM   #1990
JEP is offline JEP  Netherlands
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Hi Salas and Jaap,

Thanks for the input,

Yes I know about the long lines I thought about that to. I was thinking about putting the regulator on top ver close near the input but was afraid that that would interfere with the first stage.

Maybe a senseline from regulator to inputground?

My goal was to have as less as possible wire in the casing.

About your Wife I don't thing that will be any problem, a lot of women have seen my horns and really liked them like right now some of them even push me to paint them soon so that the can look at them again. The are only 1meter20 high.

Salas, I use it with a brush I liked the sound with it more and thanks to you I know why. Its a little bit like the Townshend rock principle.

When i finished te board I will do the trimmertuning. Its was my first decent cartridge to in the early 80's. It is a selected one from the stantonfactory. Ive used it a long time in an infinity blackwidow arm. But I broke the armtube severalyears ago by accident ofcourse when experiment with a cover for the TT.
But I really like it in the rega. I made an armboard on the micro from mdf. That will damp a bit to and tweaked the bearing.

Thanks guys, greetings roy

ps. I can post some nice wallpapers if anyone is interrested of my loudspeakers. I have a nice designs for a lineartracerarm too.
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