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Old 27th September 2012, 03:52 PM   #51
Ciu is offline Ciu  France
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Sorry, my mystake
the firts time I saw your schematic, I read it "upside/down"
My post is correct now
The caps I use are 2200uf/25v, don't need to be 50v, the board is small, the caps are filtering half-wave from 12vac.
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Old 27th September 2012, 03:57 PM   #52
Ciu is offline Ciu  France
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R10 (2,2kohms) is ajusted for the led to give 5~10mA (12v / R10)
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Old 27th September 2012, 04:08 PM   #53
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Of course the C9 and C10 are enough to be 25V, but i was asking for C6, C7, C8 (specially the latter because it's very close to the + - 30V supply voltage).

Did you get about 2V difference when measuring the L and R channel PS voltage as well?

So you reckon i should try with R1 = 1200 Ohm?
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Old 27th September 2012, 05:56 PM   #54
Ciu is offline Ciu  France
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On my boards, R1 is about 1.2 Ohms.
About 1000uF caps, I've changed some of them ,It would be better to wait next week, because I don't have boards on my hands, I've mixed some "basic" caps 1000uf, with Panasonic FM 470uf, 50v .
The PSU are +-34v , totally symmetric.
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Old 27th September 2012, 07:29 PM   #55
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Ok, i will wait then...well personally i think Elna are one of the best brands as well as being available almost anywhere and you don't have to sell any body parts to buy them. So far i have changed a few brands of caps (Nichicon, Elna, Vishay, Wima,...) and found out that russian PIO are cheap and super good, so i will try them as well.
How is the sound on your configuration? Enough bass? Any widening or 3D effect in yours?
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Old 27th September 2012, 09:09 PM   #56
Ciu is offline Ciu  France
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Yes , Elna are among best caps, but I have lot of Panasonic FC, Vishay/BC .
Output caps , 2.2uf are changed to russian k73-16, 1.8uf each, 2 connected //
(eBay | 1.8uF 100V 5% tol. PETP CAPACITORS. K73-16. Box of 60)
Other caps, 0.22uf, are also K73-16, but 0.22uf, doesn't need bigger values.
I've choosed 6N23p-EV, as tubes replacement of 6dj8
About sound, something good, but not "heaven" !!!
I think ACF-2 from tubecad is better, 6n23p-ev , cascoded in cathode follower, with symetrical PSU +-85v, from 2x60v transformer.(http://www.tubecad.com/2012/02/07/ACF-2%209-Pin.pdf)
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Old 27th September 2012, 09:21 PM   #57
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Hi I think it is strange to add a device after a device that does not sound too well just to color the sound and make it agreeable. Totally superfluous piece of gear. And yes, I have listened to them often. The owners made me listen to them as the X10D "improved" the sound quality

Better invest the money in a decent (tubed if you can't do without them) output stage so by omitting the opamp output stages. Shorter path, better results. I demonstrated this a few times with good response from the listeners. All X10D have been sold because of this and only the X pre stayed in some sets as it is a decent preamp.
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Last edited by jean-paul; 27th September 2012 at 09:39 PM.
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Old 27th September 2012, 09:23 PM   #58
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I just happen to have a K42Y-2, 0.22uF 500V here and i might give it a shot...regarding the 6N23P - already waiting ofr them (personally i've been always satisfied/happy with russian stuff being mil-spec (although normally bigger, but that is also why they sound great) and cheaper than any other items (that's why i'm using 6P14P in my RH84 and they sound excellent for half the money)...
I will check the ACF-2, and maybe make it become my next project..
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Old 27th September 2012, 09:28 PM   #59
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@ jean-paul: I totally agree with you....i usually live up to K.I.S.S. (keep it simple stupid) style and it was just for fun and if it turned out something usefull, i would use it in a guitar amp i'm building...if not, well i've learned something new!
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Old 30th March 2013, 12:47 PM   #60
Gost22 is offline Gost22  Bolivia
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Lightbulb B=+/-45V for baffer X10D

Hi guys!
What changes are needed to the schematics for the tube buffer X10-D if you increase the anode power supply B = +/-45V (or B=+/-65V)?
See schematics:
Thanks for your help!
Attached Images
File Type: jpg x10d_tube_buffer_schematic (1).jpg (59.4 KB, 199 views)

Last edited by Gost22; 30th March 2013 at 12:55 PM.
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