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-   -   Simple High Performance DC Coupled Class A HPA with sub PPM THD (https://www.diyaudio.com/forums/group-buys/323594-simple-performance-dc-coupled-class-hpa-sub-ppm-thd.html)

xrk971 16th April 2019 03:10 PM

Avtech,

That woven fiberglass/copper braid looks like great stuff but pricey at $32/meter. I guess you don't need much of it for a small preamp or HPA box. Thanks for the link.

I wonder if solder wick braid could be used for smaller cables. Sometimes, stripping off braid from used RG58 coax or household cable coax leftover bits can work too.

yourownbuzz 20th April 2019 04:32 AM

Quote:

Originally Posted by avtech23 (https://www.diyaudio.com/forums/group-buys/323594-simple-performance-dc-coupled-class-hpa-sub-ppm-thd-post5751130.html#post5751130)
Thanks X. I'll have a play around again when I get a chance. Too many projects to dwell too long! (Got all the bits for a Korg B1 that won't assemble itself!).

In the meantime, I'm pretty happy with the finish on this build.

this looks great, the sleeves are a nice touch - looks like you took a page out of the PC building book :P

avtech23 21st April 2019 12:23 AM

Thanks buzz.

True, it does look like the PSU leads inside my PC! Must've been where the inspiration came from ;)

I'll play around with it again at some point - I have an additional input to wire in when I decide what to put in - and might change the PVC out for the proper shielding sleeves (I've got an old stash of it somewhere).

I'm currently running an rPi with Volumio through an original hifiberry dac into some Audio-Technika ATH-M50x and it sounds pretty nice to me. Definitely worth the headache of soldering SMD!

Shawnstium 13th June 2019 08:28 PM

Has anyone used the 2sk209 in place of the BF862 with good results?

xrk971 13th June 2019 09:28 PM

It should work fine. 2mA current in present design fits nicely in. 10mA max for 2sk209.


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