solderdude
Administrator
measureutternutter
Posts: 4,886
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Post by solderdude on May 18, 2017 16:29:19 GMT
In this case the microphonics are due to the design of the tube.
The long thin direct heated cathode is suspended over quite a distance.
In 'normal' tubes it is not so much the cathode which is sensitive toi vibration but the grid.
Frame grid tubes, like the ECC88 and derivatives, where the grid wire is tightly wound on a sturdy frame are less sensitive to this.
Normal tubes can range from quite insensitive to quite sensitive for microphonics depending on how they are built.
But indeed tubes often become more microphonic when they are tired.
When using a HD6x0 background noise usually isn't a problem.
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Rabbit
Administrator
Posts: 7,091
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Post by Rabbit on May 18, 2017 16:58:31 GMT
Yes, it was low impedance headphones that showed everything in the noise department more.
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Post by tupisac on May 18, 2017 17:13:26 GMT
The tube and the PCB finally came yesterday and I couldn't help but start soldering after midnight  I haven't done anything DIY since I was in sixth grade (24 years ago), so I was kind of nervous...  I was ready with the soldering after two hours:  Tube glowing in the dark:  The NuHybrid put next to my solid-state discrete headphone amp:  Pictures don't work for me.... |
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Rabbit
Administrator
Posts: 7,091
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Post by Rabbit on May 18, 2017 17:45:20 GMT
What's wrong with them?
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solderdude
Administrator
measureutternutter
Posts: 4,886
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Post by solderdude on May 18, 2017 18:21:28 GMT
Well I guess he means he can't see them.
I did when I looked at the office but now can't see them.
At least not the latest ones as can be seen in the quote.
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Post by tupisac on May 18, 2017 19:06:21 GMT
Me no see pictures. Me check different computer, but no see...  |
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Rabbit
Administrator
Posts: 7,091
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Post by Rabbit on May 18, 2017 19:33:03 GMT
Oh. No troubles here at all!!
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Post by tupisac on May 18, 2017 19:38:47 GMT
I see them all besides in quoted post. Checked the urls in bbcode. They are there pointing to some cloud service, but no worky worky. Checked at work and home.
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Post by CyberGene on May 19, 2017 5:47:36 GMT
Must be the stupid iCloud photos service... Will reupload them to Dropbox.
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Post by CyberGene on May 19, 2017 6:46:05 GMT
Dropbox was cropping my pictures, Google photos drove me crazy and Flickr links didn't work but it turned out this forum is Tapatalk ready so just used it and the pictures should now be OK |
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Rabbit
Administrator
Posts: 7,091
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Post by Rabbit on May 19, 2017 6:48:25 GMT
They're all green now. Sorry .... kidding.  It looks really good too. Looks like a nice little project actually. |
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Post by tupisac on May 19, 2017 10:43:57 GMT
Thanks CyberGene, photos work now. Looks really lovely, I do want one I agree with Frans - it would be shame to hide the nutube. |
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Post by CyberGene on May 19, 2017 10:58:44 GMT
With the Sherpac case (the one in the pcitures) there's no top case, the PCB is just screwed on top of the bottom part of the case, so in some ways it is always exposed and beautiful But I have already started looking for plexiglass cutting services here in Bulgaria, seems there are plenty and besides laser cutting they also offer engraving, so when I have some time I'd definitely draw the stuff. Never worked with vector drawing software though. Any recommendation for a free vector drawing software for stuff like that? Preferably for macOS. |
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Post by tupisac on May 19, 2017 11:33:32 GMT
Try Inkscape. Or, if you're an internet sailor, go directly to Adobe Illustrator. Engraving is not that simple. I'm yet to find a material and cutting services that could manage the G1217 quality of engraving. Check out my last post here: diyah.boards.net/thread/1377/kameleon-line-filter?page=2Engraving looks kind of like 3d print, a bit melted and rough. G1217's engravings look like silkscreen print. |
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