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eXStatA Build Thread II - Page 9

post #121 of 566

Ok, I have heard from 5 Oz (and PacRim) folks regarding connectors -

 

Wink - 3

Noeb - 2

Chinsettawong - 2

Chaotic Angel - 2

Rolotube - 1

 

I am sending 15 to Rolotube, and all can ping him with how to get them from there (well, if Tony is still up for it). I was afraid there wouldn't be enough to go around, but it looks ok so far. I'll box them tonight, but will have to see when I can post (certainly in the next couple of days). Customs forms... ugh.

 

Now we have another member, what is everyone else waiting for?


Edited by pabbi1 - 8/2/10 at 8:22pm
post #122 of 566
Quote:
Originally Posted by rbarth View Post

Well, gents, it’s the end of the hybrid build road for me and the beginning of a journey into a phenomenal listening experience.  (I can already tell:  I  pulled some Miles and Keith Jarrett trio CDs off the shelf and they never sounded better!)

 

Thanks to all of you who responded to my posts and so helped me get this done.  Special thanks go to TimJo, who via a bunch of emails on Saturday, came up with the clearest and most comprehensive guide imaginable for how to wire the inputs.

   

Photos and impressions will follow after listening for a while.  (Should I post them here or on the new builds thread?)

 

Finally, thanks Alex very much for your generosity.   Your eXStatA is truly a gift that I will enjoy for a long, long time.



Congratulations - hope the revelations keep on coming.

 

There is an impressions thread that is woefully underutilized - and I think we all owe AC feedback, good and not. There are no perfect designs, only choosing the tradeoffs most important to you.

 

http://www.head-fi.org/forum/thread/462138/first-impressions-exstata-diy-electrostatic-amp

post #123 of 566

pabbi

 

No worries, happy to help out with distribution of connectors down here & in the region.

 

PM me with details at your convenience.

post #124 of 566


 

Quote:
Originally Posted by pabbi1 View Post

Ok, I have heard from 5 Oz (and PacRim) folks regarding connectors -

 

Wink - 3

Noeb - 2

Chinsettawong - 2

Chaotic Angel - 2

Rolotube - 1

 

I am sending 15 to Rolotube, and all can ping him with how to get them from there (well, if Tony is still up for it). I was afraid there wouldn't be enough to go around, but it looks ok so far. I'll box them tonight, but will have to see when I can post (certainly in the next couple of days). Customs forms... ugh.

 

Now we have another member, what is everyone else waiting for?


Thank you, Al.  I'm looking forward to receiving them soon.  I'll ping Rolotube.  :)

 

As for the build, I'm still waiting for some transistors.  I'm having a difficult time finding the high voltage PNP tr around here.

 

Wachara C. 

post #125 of 566

The tubes from Al has safely arrived. Thanks! I would love to trade one of my RCA disc-getter tube with somebody else's RCA d-getter tube though, I just need one more and I will get 4 d-getter tubes!

post #126 of 566
Quote:
Originally Posted by rbarth View Post

...Special thanks go to TimJo, who via a bunch of emails on Saturday, came up with the clearest and most comprehensive guide imaginable for how to wire the inputs.

   

Photos and impressions will follow after listening for a while.  (Should I post them here or on the new builds thread?)...

 

 

Might be useful [assuming TimJo doesn't mind] if you posted some of that Clear and comprehensive guidance here in this forum for reference.

 

There is a first impressions thread in existence  started by Pabbi1 if I remember correctly
 

post #127 of 566
Quote:
Originally Posted by ujamerstand View Post

I would love to trade one of my RCA disc-getter tube with somebody else's RCA d-getter tube though, I just need one more and I will get 4 d-getter tubes!


Anybody? 

 

Anyways, the most important component for this project has arrived. 

 

4861043543_9782e08187.jpg

 

brings a little tear to my eyes...

post #128 of 566
Quote:
Originally Posted by pabbi1 View Post

Ok, I have heard from 5 Oz (and PacRim) folks regarding connectors -

 

Wink - 3

Noeb - 2

Chinsettawong - 2

Chaotic Angel - 2

Rolotube - 1

 

I am sending 15 to Rolotube, and all can ping him with how to get them from there (well, if Tony is still up for it). I was afraid there wouldn't be enough to go around, but it looks ok so far. I'll box them tonight, but will have to see when I can post (certainly in the next couple of days). Customs forms... ugh.

 

Now we have another member, what is everyone else waiting for?

 

If it's not too late I'd also like some stax connectors. Just stick a few more in Wink's package and they'll get to me. Thanks!

post #129 of 566
Quote:
Originally Posted by ujamerstand View Post




Anybody? 


Pabbi is probably the only one who could help you out...

 

post #130 of 566

I remember all of them has been sent out... I'm hoping that at least one other person who got the RCAs from pabbi would have a D-getter tube that they are willing to trade. :)

post #131 of 566
Thread Starter 

Gentlemen, in the last week several of you have emailed me about failure conditions if one tube goes out in the hybrid. Most of you were concerned about the PS.

 

In this situation, there isn't any risk to the PS because the current demand from the tubeless channel is not much lower than a working channel and the additional heat in the PS will not be severe nor damage it.

 

However, these questions forced me to look at the hybrid amp again just to explore this failure condition more.

 

Most of you would probably power down quickly if one side of the amp went out, but if the amp is left on with one (or both) tubes not lit then resistors R31 to R34 will exceed their power dissipation. If you want to be safe against losing these resistors, if you don't turn the amp off right away or it is left unattended, the easy fix is to use 1/2W resistors instead of 1/8W.

 

You can use 71-CCF55-75K or 273-75K-RC. They are longer than the RN55D but they should still fit if you tilt them at an angle.

 

There are quite a few hybrids out there in service and no one has reported this problem yet, but it will surface when tubes start to die during operation.

 

I'd like to have caught this a while ago gents, but just didn't see this corner case.

 

Thanks to everyone who asked the question.

 

Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #132 of 566
Quote:
Originally Posted by runeight View Post

Gentlemen, in the last week several of you have emailed me about failure conditions if one tube goes out in the hybrid. Most of you were concerned about the PS.

 

In this situation, there isn't any risk to the PS because the current demand from the tubeless channel is not much lower than a working channel and the additional heat in the PS will not be severe nor damage it.

 

However, these questions forced me to look at the hybrid amp again just to explore this failure condition more.

 

Most of you would probably power down quickly if one side of the amp went out, but if the amp is left on with one (or both) tubes not lit then resistors R31 to R34 will exceed their power dissipation. If you want to be safe against losing these resistors, if you don't turn the amp off right away or it is left unattended, the easy fix is to use 1/2W resistors instead of 1/8W.

 

You can use 71-CCF55-75K or 273-75K-RC. They are longer than the RN55D but they should still fit if you tilt them at an angle.

 

There are quite a few hybrids out there in service and no one has reported this problem yet, but it will surface when tubes start to die during operation.

 

I'd like to have caught this a while ago gents, but just didn't see this corner case.

 

Thanks to everyone who asked the question.

 



Hi Alex,

   Any possibility of changing this in the BOM online?

post #133 of 566

Well, I am completely out of anything other than (NFS) Tung Sol, so I'm no help there. You might ping one of the eBay sellers, though shipping for a single tube is always excessive. You might also ping one of the internet sellers (http://www.vacuumtubes.net/ comes to mind, or www.Tubedepot.com ), This looks like a good candidate

 

Pity I am chasing different glass at the moment, so doubtful I buy any more 6s4a tubes.

 

On a far happier topic, a box with 15 Stax connectors left Dallas today heading for Oz. I *think* 13 are spoken for, with Jin getting 2 (or 3), so:

 

Wink - 3

Noeb - 2

Chinsettawong - 2

Chaotic Angel - 2

Rolotube - 2

Jinh - 2 (unless you are doing two builds, then 3)

 

So, there are one or two left unclaimed, and I will leave it solely at Tony's discretion as to how they get distributed, SO, everyone ping Rolotube to arrange postage out to you, as he should see the box this time next week.

 

Should be some building frenzy about now, eh?

post #134 of 566

I suppose it's 2 then. Thanks! :)

post #135 of 566
Thread Starter 
Quote:
Originally Posted by les_garten View Post





Hi Alex,

   Any possibility of changing this in the BOM online?



Yes. I'll try to get to it tonight or tomorrow night along with adding something on the website to draw attention to it.

Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
Reply
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