Low gain preamp options


I’ve read lots of preamp suggestion threads and discussions on amp matching. I don’t know what percentage of people have digital only systems, but it seems like there is a missing niche for preamps.

Most DACs have at least a 2V output which exceeds the input sensitivity of most amps. So unlike a phono input there isn’t a real need for gain in most cases. The problem with a passive preamp is some amps don’t have high enough input impedance. Also a preamp allows longer cable runs (if needed). Then there’s the whole tube warmth or tone that some people are so fond of in taming perceived digital harshness.

I’ve read about lots of tube preamps, but even the low gain ones are still in the 10dB range. It would be nice to have a useful amount of volume adjustment instead of silent to too loud with just a wiggle.

The only unit that comes to mind that’s even close is a Schiit Saga+, but it seems like even mid-fi systems should be able to do better. Don’t get me wrong, I’m using one now. It’s great for $400, but at some point it’s going to become the weak link in my system (if it isn’t already). 

List of desired features:
<6dB gain 
<500 ohm output impedance
tubed output
at least 2 sets of outputs
balanced in/out optional

Anything out there that fits the bill?

cat_doorman
Talk to Aric of Aric Audio. He makes 3 tube  preamps at different price levels having variable output gain, low output impedance, and 2 sets of outputs. Aric has a nice website.
I should state that I agree with the gain issue given digital component output voltages. Two volts seems to be the minimum. Too many amps with far too low a sensitivity rating. I have a Line Magnetic integrated which is 0.2V sensitive. Even in triode mode at 15wpc driving Tannoy Sterlings (91dB, 8ohms) can't get past 9 o'clock in my 12'x15' room. 


Aren’t variable or adjustable gain preamps just adding in another attenuator on the input? So yes, you do get more useful range on your volume control, but you’ve also knocked down your signal so you can then amplify it again. Maybe that’s the only way to get the circuit to do anything useful so your output impedance is regulated. There might be a minimum required gain to keep the circuit linear. That might be all a buffer does for all I know - attenuate the signal and then amplify it by the same amount for no net gain. Wasn’t planning on doing enough research on circuits for a DIY project. I was really hoping I just hadn’t found what I think should exist or someone could tell me a good reason why it doesn’t exist.
I added a passive pre with a remote that was almost perfect for a guy. He would NOT give up his tricked out Fisher 500 pre. He couldn't get up to change the volume either.  The guy had it made for 4-500 dollars.. Silver traces and good pots.. I thought it was Dodd, wonderful work.. 20-25 years ago.. It lost nothing in SQ that I could hear.. La Scala will show noisy or bad equipment.. 100+ sensitive.. OH YEA..

Regards
A passive might work with the amps I have now, but I've been looking at some others that have input impedances in the 10k range. When running at full volume that may be fine but at lower volume I think it might cause issues. If I remember right poor impedance matching can get you some roll off on the low end which is where you would theoretically want to boost it to compensate for perceived roll off at lower volumes. (Fletcher-Munson) 
The other thing is I really like whatever the tube in the Saga+ is doing. I think I'd miss that. When I first got it I did a lot of comparing to my MF A300 integrated preout even going so far as to use it as a pre into the A300. I'll need to start paying attention to how much I actually use the volume control. Maybe I'd like even more tube sound even if it means having to put up with only a very small portion of usable adjustment. I really hope the eventual solution isn't to spend $10k+ on a vinyl rig and record collection.