Hi everyone
I am sourcing parts for the tube-i-zator board and I am not sure which value for the R i/v I should get. I'm using the Buffalo ess9008 as dac, in the manual it says that:
"The output of the buffalo can be used as a voltage source or a current source. Best DNR and THD will
be achieved using it as a current source.
The differential output of the buffalo is 0.924*1.65V (3.1746 Peak) + 1.65 DC bias and the series
output resistance is nominally 195 Ohms at each output."
So I understand that I can configure for either V or I output? But the value will be different for each configuration right? And in either case I dont know how to calculate the R value I should get.![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I am sourcing parts for the tube-i-zator board and I am not sure which value for the R i/v I should get. I'm using the Buffalo ess9008 as dac, in the manual it says that:
"The output of the buffalo can be used as a voltage source or a current source. Best DNR and THD will
be achieved using it as a current source.
The differential output of the buffalo is 0.924*1.65V (3.1746 Peak) + 1.65 DC bias and the series
output resistance is nominally 195 Ohms at each output."
So I understand that I can configure for either V or I output? But the value will be different for each configuration right? And in either case I dont know how to calculate the R value I should get.
Hi neda,
the russian military 6N2P are balanced between the two triodes inside AFAIK.
That is recommended for every tube in a SRPP circuit like the Tube-I-zator.
To get an optimal channel balance i would prefer also to use a matched pair.
The SSHV shunt should be set to 150V output voltage, yes.
![wave :wave: :wave:](https://files.diyaudio.com/forums/images/smilies/wave.gif)
the russian military 6N2P are balanced between the two triodes inside AFAIK.
That is recommended for every tube in a SRPP circuit like the Tube-I-zator.
To get an optimal channel balance i would prefer also to use a matched pair.
The SSHV shunt should be set to 150V output voltage, yes.
![wave :wave: :wave:](https://files.diyaudio.com/forums/images/smilies/wave.gif)
Hi Oliver,
Hope you had a great weekend.
The BOM calls for .25w resistors in the anode power supply section of the tube-i-zator, but in your photo it looks like your using 1/2watt's.
Which size do you recommend?
Best,
Ned
Hi Ned,
that depends strongly on your HV PSU Setup. If you use the standard setup with the 6N2P, you have P=U*I :
An externally hosted image should be here but it was not working when we last tested it.
1,2V*1,15mA=1,4mW, so a 0,25W resistor is ok.
If you use the SSHV-Shunt Module set with the 56R to the recommended ~36mA shunt current, you have:
An externally hosted image should be here but it was not working when we last tested it.
38V*38mA=1,44W. So the resistor must be changed to a 2W type.
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Oliver,
Are you powering the tube-i-zator, and shunt module with the 120v or 150v tap of your trany?
Ned
Ned,
yes.
The Tube-I-zator stand alone with the 120V tap and with the SSHV Shunt module, i switch to the 150V tap.
Wow Oliver, those receptical pins for the output resistors were tough to solder in straight. I got them done though. Thanks for the link to buy them! I have the Tube-I-zator V2.0 with the Buffalo II Balanced version almost complete now! I just need to solder the analog and digital wires to the XLR and RCA jacks. I will post some pictures when I am done. I appreciate all your help with this Oliver. I may need to ask a few more questions before I am done though. I hope you don't mind.
Greg
Greg
Got some photos of the balanced version of the Tube-I-zator boards with the Twisted Pear Buffalo II DAC. Fully balanced version plus single ended. I have some Telefunken ECC88/6DJ8 tubes in it now. Sounds phenominal!! I would like to thank Oliver for all his help, I could not have done it without him. Thank you Oliver!!!![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Pictures are below!! Sorry for the bad quality as they are from my Iphone.
Greg
![wave :wave: :wave:](https://files.diyaudio.com/forums/images/smilies/wave.gif)
Greg
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