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FS: Nelson Pass "CSX1/2" "Buffered F6" Front End PCBs
FS: Nelson Pass "CSX1/2" "Buffered F6" Front End PCBs
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Old 10th October 2016, 03:55 PM   #1
luvdunhill is offline luvdunhill  United States
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Default FS: Nelson Pass "CSX1/2" "Buffered F6" Front End PCBs

Here's the First Watt article in question:

http://www.firstwatt.com/pdf/art_sony_vfet_pt1.pdf

For the F6 version, just search for "diamond buffer" in the F6 thread, there are numerous posts that show lower distortion. This PCB could be used to implement that same scheme.

I have a few of these PCBs left-over that I'd like to offer up to the community. The price is $7.50/channel plus shipping. I'd expect shipping to run between $5 (US) and $15 (international) - but the amount will be paid after they ship for exact charges (so, two PayPal payments).

They are 2 layer, 1.6mm thick, 1oz copper, blue with white silkscreen, ENIG plated. I'm including a BOM and supporting files in this post. The relay allows for the buffer to be added and removed via a remote switch. Also, a jumper block which controls how the transformer primaries are configured is provided. These could all be optional and you can just use the XLR input to the transformer, if you'd like. Lots of ways to use this board.

Minimal set of transformers supported are:

Cinemag CMOQ-4
Jensen JT-123-FLPCH
Lundahl LL1684, 1690, 1948
Lundahl LL1588, 1592
Lundahl LL1527, 1527XL, 1527A, 1591, 1540
Sowter 4652
Attached Images
File Type: jpg csx_fe_block.jpg (264.6 KB, 890 views)
File Type: jpg csx_fe_bom.jpg (511.2 KB, 888 views)
File Type: jpg csx_fe_top_silk_dimensioned.jpg (288.6 KB, 840 views)
File Type: png csx_fe_top_rendering.png (73.5 KB, 829 views)
File Type: png csx_fe_bottom_rendering.png (42.9 KB, 808 views)
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Old 10th October 2016, 03:58 PM   #2
luvdunhill is offline luvdunhill  United States
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Default FS: Nelson Pass "CSX1/2" "Buffered F6" Front End PCBs

Adding the buffer and the regulators would look something like this, though mounted vertically. I will post a picture of a complete stuffed board later on.
Click the image to open in full size.
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Old 20th October 2016, 01:41 PM   #3
luvdunhill is offline luvdunhill  United States
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Populated and ready for some measurements!

Click the image to open in full size.
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Old 16th November 2016, 09:42 PM   #4
marc brown is offline marc brown  United States
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Nice PCB's. Do you have any left?

As an aside, who do you use to print your PCB's?
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Old 16th November 2016, 09:44 PM   #5
luvdunhill is offline luvdunhill  United States
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Quote:
Originally Posted by marc brown View Post
Nice PCB's. Do you have any left?

As an aside, who do you use to print your PCB's?

I have lots left.

I think I used PCBway for these.
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Old 8th December 2016, 08:40 PM   #6
luvdunhill is offline luvdunhill  United States
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I have two boards remaining.
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Old 10th December 2016, 11:32 AM   #7
ZacharyP is offline ZacharyP  United States
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Are you interested in selling the board populated as pictured earlier in the thread?
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Old 10th December 2016, 02:03 PM   #8
luvdunhill is offline luvdunhill  United States
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I don't think I am at that point. Still wanting to listen to the various combinations of buffers and transformers...
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