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F5X -- the EUVL Approach
F5X -- the EUVL Approach
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Old 20th May 2011, 02:42 PM   #211
NYCOne is offline NYCOne  United States
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Quote:
Originally Posted by CeeVee View Post
These are very difficult to source, the 2sj74s i mean, i got some from AMB labs but they all have IDSS in the high 10mA range.
The matched sets from Spencer are in the same range.

2SK170BL in the 6mA and 7 mA range are easier to find.
I am very sympathetic to anyone doing a balanced build.

I have a large number of match JFETS in EVERY Idss range, even sets already matched for the degeneration difference. I did this for my builds.

Let my know by PM if you need a set of matched Octets, or if you would like two matched Quads.

I used an Octet, and have sent other Octets to other builders, but they are a much more difficult match, as you might imagine.
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Old 20th May 2011, 03:20 PM   #212
EUVL is offline EUVL  Europe
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May I suggest you open a thread at the swap meet forum for your very generous offers.

Most sincere thanks,
Patrick
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Old 20th May 2011, 03:22 PM   #213
Horio is offline Horio  United States
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I have a (150) 2SK170-BL's, and I've matched 50 of them. So far I have been getting a nice range of values with most of them in the 6-9mA range. Hopefully the remaining 100 jfets are nicely distributed as well. Once I get the remaing jfets matched, I can probably help out a few people as well.
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Old 20th May 2011, 03:26 PM   #214
EUVL is offline EUVL  Europe
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You can see a typical distribution of Idss for a large enough batch (in this case 500) of 2SK170s and 2SJ74s.
The measurements were done in January 2009.
(Blue is 2SJ74.)

http://www.diyaudio.com/forums/solid...ml#post1730586


Patrick

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Last edited by EUVL; 20th May 2011 at 03:31 PM.
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Old 20th May 2011, 06:10 PM   #215
NYCOne is offline NYCOne  United States
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Quote:
Originally Posted by EUVL View Post
May I suggest you open a thread at the swap meet forum for your very generous offers.

Most sincere thanks,
Patrick
Not interested in a business, just trying to help your builders.

None the less, I'll post something.

Last edited by NYCOne; 20th May 2011 at 06:15 PM.
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Old 24th May 2011, 04:32 AM   #216
EUVL is offline EUVL  Europe
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Default Updated Case Parts Photos

We got the prototype case parts back after some revisions and re-finishing.

We shall post them part by part today.
Assembled later in the week.

Starting with the front panel.


Patrick

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File Type: jpg 110524 Front Panel.jpg (149.4 KB, 1115 views)
File Type: jpg 110524 Front Rear.jpg (223.7 KB, 1085 views)

Last edited by EUVL; 24th May 2011 at 04:49 AM.
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Old 24th May 2011, 04:39 AM   #217
EUVL is offline EUVL  Europe
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Followed by the cradle, transformer feet, regulator heat sink & PCB, and associated parts.

The plates joining the heat sink will get a much better looking (in design) revision later.
The heat sinks will get re-anodised (to all black).

And the O-Rings will get white silicone.

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Last edited by EUVL; 24th May 2011 at 04:49 AM.
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Old 24th May 2011, 04:41 AM   #218
EUVL is offline EUVL  Europe
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The structural parts :

machined extrusion angles, cross bars, handles, ...

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Last edited by EUVL; 24th May 2011 at 04:50 AM.
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Old 24th May 2011, 04:47 AM   #219
EUVL is offline EUVL  Europe
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Main heat sink (Conrad MF35-151) feet and bottom covers.

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File Type: jpg 110524 bottom.jpg (270.1 KB, 348 views)

Last edited by EUVL; 24th May 2011 at 04:53 AM.
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Old 24th May 2011, 04:52 AM   #220
EUVL is offline EUVL  Europe
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Machined Delrin Cap PCB Mount to hold 2 PCBs (top & bottom).

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