Hello all. I've been lurking and hoping to build one of these, so you can add another to the list.
Personally, I'm OK with the one board per channel approach, but I can see where the 2 board per channel approach would be useful for other projects.
My 2 cents is that I wouldn't mind having more space on the board for caps in the signal path. Wima's are fine, but there is a whole world of caps out there (including quite a few in my workbench) and I personally don't mind if the board is a little bigger to make room.
Other thoughts?
Jac
I had some of Jan's boards ran a few months ago, so the tooling costs are sunk. I could have more made up if there's interest and Jan and SY don't mind. I think with shipping cost is around $6 per board.
That's cheaper than me sourcing my own so yes please if we can find a few more to come in on that. I have someone who can receive in Dallas to keep shipping down.
Not sure if they have caught up with the thread, but jgf and Joel (Canada) were interested on page 7. That would be in the neighborhood of 24 to 32 boards. I'm in no rush, but that looks like it could be getting in the range where an order would be cost effective. How many did you have in mind for an order?
I just offered because billshurv wanted Jan's boards specifically. I'm not sure what the other folks want, and don't want to step on any toes. There's no minimum with the shop I use, so it's really about the economics of shipping and insurance as the tooling has already been paid for on my previous order.
Just to avoid confusion, as I'll be doing other things than phono with some boards I would also have a pair from Jackinnj when his next shipment of round tuits comes in. Not least that I can have a line stage as well in the nice case that used to contain a fairly rubbish counterpoint SA-1000 🙂
Just for the record, I'm good with Jan's boards too. I'm probably getting over anxious, but I just ordered my first reasonably good cartridge and I just know that my current crap phono pre won't cut it.
Now we just need to make sure we aren't stepping on anyone's toes. How about SY and Jack, any issues with a little combined order of Jan's boards?
Jac
Now we just need to make sure we aren't stepping on anyone's toes. How about SY and Jack, any issues with a little combined order of Jan's boards?
Jac
As long as no one makes a profit from selling the boards, just covering their costs, then SY is happy with it, as I checked when I was considering getting some made (not knowing that JP was way ahead of me).
I refuse to have any commercial interests in audio. The design is out there for people to build and play with as they wish. So I have no toes to step on. 😀
I'm still in for enough boards for 1 or 2 preamps (depending on cost). Jan's boards look good to me.
Another thing, I see the diyaudio store has LSJ74 currently available in 2 of the 4 grades, are these acceptable? and which is preferred?
- Grade C (Idss 10 - 20)
- Grade D (Idss 20 - 30)
I'd probably go for C.
Other tip: 2SJ108 can potentially work well. And for the second stage, where noise isn't as critical, 2N5114 or J271 might work.
Other tip: 2SJ108 can potentially work well. And for the second stage, where noise isn't as critical, 2N5114 or J271 might work.
I'll get a fresh quote, but it came out to $5.88 per board on my last order of 24. I'll get a quote for another 24.
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This is a MUST HAVE for me. IIRC, SY was working on this from his secret lair in Austin...and then...the move to Chi-town. 😡
I can sell my Mistral phone pre and have a much better phone pre in exchange. Definitely a win!
I can sell my Mistral phone pre and have a much better phone pre in exchange. Definitely a win!
If you do not mind sending to Europe I would like 4 boards as well... That's Ok for stereo, right?
pFET?
Now that it looks like we are on the path to ordering some boards, I went back to the pFET discussion between jgf and SY. Looking on google and the usual suspects (Digikey, Mouser, Newark), there aren't any of the 2SJ108 alternative suggested by SY available commercially. In fact, the only available p-channel JFETs I could find are the Fairchild J176_D74Z which are an order of magnitude worse for noise.
So the choice appears to be the diyAudio store LSJ74 C spec with too much Idss or ebay for questionable 2SJ74. Price is about the same between the 'bay' and the 'store'. How do you guys weigh the C .vs. GR spec LSJ74 against the risks at ebay? How much trouble does that C spec introduce?
Jac
Correction. I did find a few pf the J271 at Mouser for a cheap price. The only other p-channel JFETs were more expensive than the LSJ74. I must be missing something here.
Now that it looks like we are on the path to ordering some boards, I went back to the pFET discussion between jgf and SY. Looking on google and the usual suspects (Digikey, Mouser, Newark), there aren't any of the 2SJ108 alternative suggested by SY available commercially. In fact, the only available p-channel JFETs I could find are the Fairchild J176_D74Z which are an order of magnitude worse for noise.
So the choice appears to be the diyAudio store LSJ74 C spec with too much Idss or ebay for questionable 2SJ74. Price is about the same between the 'bay' and the 'store'. How do you guys weigh the C .vs. GR spec LSJ74 against the risks at ebay? How much trouble does that C spec introduce?
Jac
Correction. I did find a few pf the J271 at Mouser for a cheap price. The only other p-channel JFETs were more expensive than the LSJ74. I must be missing something here.
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The other transistor to look out for is the 2SJ107BL. They show up from time to time.
My noise experience with early '80s vintage J271 was not great, but I have no idea if the newer devices are better. Anyone have any measurements?
My noise experience with early '80s vintage J271 was not great, but I have no idea if the newer devices are better. Anyone have any measurements?