Seeking Advice on NOS DAC

This may be a silly question, but is it helpful to use a reclocker before the input to a R2R DAC? I know the reclocking device should not do any upsampling.

Low, regarding a USB/SPDIF converter, I use a Audiophilleo2 with the Pure Power supply between my MAC Mini with Pure Music playback to a Bryston BDA-1. They have come up used here on AG ocassionaly. The AP2W/PP should be had for under $400 used. 

I believe your 1V input sensitivity means your amp/amps achieve full output power with a 1V input.  This is relatively low and should work with about any DAC.  To me, the bigger issue is matching impedance if you are adjusting volume with a passive device.  This can be a significant issue and is probably why I am an advocate of preamps, even though mine is adjusted for unity gain (and buffered).
For example, the Jade and the Adagio (both with onboard volume adjustment) output 2V single-ended (rca) and 4V balanced (XLR) with the volume control handled by adjusting the reference voltage, which does not affect the signal.  Only a few high-end manufacturers (I can only think of Metrum and Empirical Audio right now) offer this type of volume adjustment when going sans-preamp - directly from DAC to amplifier. 
How do you adjust your volume if your DAC directly feeds your tube amp?

I believe your 1V input sensitivity means your amp/amps achieve full output power with a 1V input.

@mitch2 , that's correct; 1V at full power. Regarding the Hex (2V unbalanced), I'm sure it will be a fine match as far as impedance and amp input sensitivity.
Let me give you the back-story, I'm using a PS Audio Nuwave DSD with 2.8V output and I believe it is driving my amp into clipping (sounds like distortion thru speakers). I have a thread posted about jitter control in which several members stated that I'm experiencing clipping due to the low 1.0V input to the amp. At first I thought the harsh sound was due to jitter, but overdriving the amp makes the most sense since it only happens on loud passages, such as a crescendo and close-mic'd brass.
My amp has a nice feature, a direct input with variable gain control; but only up to 1V max. Input impedance is 100 kohms.

I have an Atma-Sphere SE preamp that I take in and out of the system, and there is the same distortion sound during loud passages.
I actually checked other SE tube amps such as Quicksilver and CJ and they have 1.0 input sens. I guess when paired with a preamp with the right amount of gain, it works well.

I have been looking for a NOS DAC with analogue VC and haven't seen a suitable one yet. As far as the Jade and the Adagio, they would be ideal, but none are listed yet in the used market.
I appreciate you keeping up with me on this thread.

Thanks @mesch . And now Schiit makes a converter.