Buffer amp no gain

micro iTube2 by iFi audio - Vacuum Tube Buffer and Line Stage Preamplifier (ifi-audio.com)

Sorry if I did not explain fully. I have no need for any gain in my system so the preamp needs to add no amplification.

Additionally after a lot of trial and error the passive volume control is great. 

What I want to do is to better match the output impedance of the DAC with the input impedance of the power amp.  PVCs work against you in this.

It could be argued if it sounds great now, then why change it. Its just an itch to be scratched.

Thanks noromance. My system is built around simplicity and all the cathode followers I have found have volume controls or, like the ifi, lots of redundant circuitry.

Picture the First Watt B1 with volume controls removed and that is what I would like to buy

https://www.decware.com/newsite/ZROCK.html

You are looking for a unity gain (i.e., voltage in = voltage out) buffer.

There are some tube buffers available such as one made by Tortuga and the two linked already in this thread but, as you pointed out, you do not need or want the volume control. I suspect it would be easy to construct the Pass B1 buffer without a volume control. It appears they still sell the board through the store. I suspect you would replace the VC with the correct value resistor, assuming you will operate it from the output of your current VC. I am not the one to help with that but I suspect it would be easy to do. This article may also be of some help.