gemini86
Well-known member
Yes the output is 10k so a stepdown is required to feed 600 ohms.
gemini86 said:http://tubedata.itchurch.org/sheets/049/5/5965.pdf
http://tubedata.itchurch.org/sheets/093/1/12AV7.pdf
Pretty close...
JAB said:ah, cool, those do look pretty close. Thanks for the links.
Did some re-reading in the original thread, and it looks like these work pretty well in the one-bottle, although some people found them noisier than 12aV7.
buildafriend said:How do you guys feel about the sowter 9735 as an input transformer? Is it ideal or sufficient?
JAB said:link to a pic of the original NYD psu:
http://i261.photobucket.com/albums/ii49/aaronmoore82/NYDpsu_p01.jpg
Kingston said:gemini86 said:http://tubedata.itchurch.org/sheets/049/5/5965.pdf
http://tubedata.itchurch.org/sheets/093/1/12AV7.pdf
Pretty close...
JAB said:ah, cool, those do look pretty close. Thanks for the links.
Did some re-reading in the original thread, and it looks like these work pretty well in the one-bottle, although some people found them noisier than 12aV7.
5965 and 5965A are drop in replacements. I was the one who originally said they were noisier. They are not. I said that when I was taking beginner steps, didn't know enough and my p2p layouts sucked.
I've since gotten to know these tubes a lot better, and from trying to source 12AV7 from around ebay, I'd say chances are most of the 5965 tubes you will find will actually be better quality than the 12AV7 that are still around.
gemini86 said:So to be clear, the output tx must be 10k:600 step down. at the least. That's a 4:1
gemini86 said:impedance ratio is turns ratio, squared.
so 10000/600 is 16.666(repeating)
sqrt of 16.666 is 4.082401254164024
... or 4 is close enough.
JAB said:link to a pic of the original NYD psu:
http://i261.photobucket.com/albums/ii49/aaronmoore82/NYDpsu_p01.jpg
the link should work, but if not, go to the NYD one-bottle thread, and use the forum search engine for "NYD PSU". I built my pair with this PSU (some values changed for feeding 2), and had some hum. moving layout around fixed most of it, but when I crack the chassis next time, I'm going to try a rebuild with more filtering. However, this PSU works fine, and the hum is really only evident at highest gain settings.
Re: input tx - cinemag is great... any reason that you're using the CMMI 7 instead of the CMMI 10? Strikes me that the higher step up should give some free gain, which could be handy if you decide to add an output tx.
Re: output tx - I used one (a gapped carnhill 9600:600 from audiomaintenance - I like it). The original NYD build didn't. The result of having one is less overall gain, but you can plug your one-bottle into whatever without reservations. Also, colouration can be fun. I think that max gain with an output tx was around 36db. Despite what I thought at the time, that's hasn't been an issue.
Re: reading - do lots of it. Read the NEETS stuff, read RDH, and most importantly, read up on how to safely work on tube gear. I've done a couple of tube builds, and I still go over safe working habits every time I think about opening anything. 300 VDC = no second chances.
Also, it's probably worth it to re-read the original one-bottle thread through. It meanders, but there's a lot of good info in there, and I'm pretty sure that eventually there's a revised schem that has an output tx, a DI point, and some different (optimized) parts values. A lot of it is stuff that many folks on here could (and did) figure out themselves, but I was definitely happy to have it on paper in front of me.
JAB said:link to a pic of the original NYD psu:
http://i261.photobucket.com/albums/ii49/aaronmoore82/NYDpsu_p01.jpg
the link should work, but if not, go to the NYD one-bottle thread, and use the forum search engine for "NYD PSU". I built my pair with this PSU (some values changed for feeding 2), and had some hum. moving layout around fixed most of it, but when I crack the chassis next time, I'm going to try a rebuild with more filtering. However, this PSU works fine, and the hum is really only evident at highest gain settings.
Re: input tx - cinemag is great... any reason that you're using the CMMI 7 instead of the CMMI 10? Strikes me that the higher step up should give some free gain, which could be handy if you decide to add an output tx.
Re: output tx - I used one (a gapped carnhill 9600:600 from audiomaintenance - I like it). The original NYD build didn't. The result of having one is less overall gain, but you can plug your one-bottle into whatever without reservations. Also, colouration can be fun. I think that max gain with an output tx was around 36db. Despite what I thought at the time, that's hasn't been an issue.
Re: reading - do lots of it. Read the NEETS stuff, read RDH, and most importantly, read up on how to safely work on tube gear. I've done a couple of tube builds, and I still go over safe working habits every time I think about opening anything. 300 VDC = no second chances.
Also, it's probably worth it to re-read the original one-bottle thread through. It meanders, but there's a lot of good info in there, and I'm pretty sure that eventually there's a revised schem that has an output tx, a DI point, and some different (optimized) parts values. A lot of it is stuff that many folks on here could (and did) figure out themselves, but I was definitely happy to have it on paper in front of me.
buildafriend said:What if I used http://angela.com/angelametalizedpolypropylenecapacitor18uf630vdc-2.aspx as my output coupling capacitor? ( 1.8uF instead of 2.2uF )
gemini86 said:All 1n4007 are 1000v 1a...
Hammond makes tube voltage transformers, as does antec. I also like the pts from ted weber. And a center tap is just that...a tap in the center of a winding. You just need 240V and 6.3(or 12.6). Center taps are optional.
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