July 7, 200817 yr I'm considering getting a few Pass Pearl phono PCBs made up. Is there any interest here?
July 7, 200817 yr Author actually, I found someone with a stash of the original PCBs sold by PassDIY. So, I'm going to go this route myself. I will inquire on how many they have. Also, if anyone is wanting to split a pair (the boards are mono, so 2 required for stereo) I'm up for that too as I'd like a single board for a mono preamp.
July 7, 200817 yr Author Don't suppose 4 could be used as a balanced phono stage? for MC? nah, just 2 needed for balanced operation
July 7, 200817 yr Author service manual and BOM for Pearl: http://www.passdiy.com/pdf/pearlphono.pdf grawk: the Xono has a balanced output, yes, but it's not generated how you might think. Here's a schematic of the MM portion of the Xono (edit: not the exact circuit, but same topology): http://www.rstaudio.de/AlephOno/Rev2/AlephOnoMM.pdf The circuits are indeed different, this is a common misconception.
July 7, 200817 yr That's way over my head . If 2 of these can be made into a balanced phono stage, I need to talk to someone about what it'd take to get that done...
July 7, 200817 yr Author That's way over my head . If 2 of these can be made into a balanced phono stage, I need to talk to someone about what it'd take to get that done... yeah, it cannot really be made into a phono stage with balanced outputs...
July 7, 200817 yr Author looking at this again, I think it can support MC carts as low as 0.4mV or so...
July 8, 200817 yr Author Someone build me one it's a pretty straightforward project really. no circular hole tech skills needed.
July 8, 200817 yr it's a pretty straightforward project really. no circular hole tech skills needed. Right but I am lazy and don't want to gather the parts and largely don't want to do any case work.
July 8, 200817 yr Author Price will be $40 per stereo set, with a few dollars for shipping from Germany to me (depends on the number of people interested, probably around $4) and then a few dollars shipping from me to you. The board files are available, but I'd rather go this route personally. I'll close this IC on Friday 7/11/08 and collect money over the weekend.
July 8, 200817 yr Depending on how it breaks down it might actually be better to have the boards sent to someone in the US who could then send you your set and forward along the others saving an unnecessary trans-Atlantic trip. Just a thought.
July 8, 200817 yr Author yes, that's the plan. I may be doing a group buy for the Linear Systems JFETs, assuming there is enough demand. These will work fine with these boards if you cannot come across the Toshiba parts.
July 8, 200817 yr yes, that's the plan. I may be doing a group buy for the Linear Systems JFETs, assuming there is enough demand. These will work fine with these boards if you cannot come across the Toshiba parts.The footprint/package type isn't even close to being the same on these???
July 8, 200817 yr Author The footprint/package type isn't even close to being the same on these??? close enough for government work
July 8, 200817 yr Author MILSPEC??? heh.. the Toshiba parts a D1G1S1xS1G1D1 from left to right. The LSK389 are S1D1G1 on one side (so snake the S1 between D1 and G1 and your good there) and S2D2G2 on the other (so snake G2 between S2 and D2). I'd recommend using zigzag sockets on the original 2sk389 socket to facilitate this, so you can get the new device situated in the socket and then plug the socket into the PCB and solder it. If you're less adventurous, just use a matched pair of the single devices.
July 8, 200817 yr The footprint I have seen of the LSK is a round footprint, not linear? I suppose with some creative lead bending and perhaps some teflon tubing... http://www.linearsystems.com/datasheets/LSK389.pdf
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