2. amps-preamps
  3. 165197-132585

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

Showing 1 response by daledeee1

daledeee1's avatar
daledeee1
631 posts
 
I just went through this with my system.  I was running direct from DAC to amp but the digital volume was unpredictable and appears to "bit strip" in some cases.  It does not sound right unless you turn it up.  I also can get quite loud volume without the preamp.  So this leads me to believe a passive will work.  My amp has 50 kohms input resistance.

I talked to Roy Mottram at tubes4hifi.  We are going to try a buffered passive preamp.  It will be one of his stock preamps without the gain tubes.  I can run volume only or tube buffer and if that doesn't work right we can add a small amount of gain.  He also sells a Chinese preamp that has 6 dB of gain for $500.  The one I am getting is a custom SP12.  I will be receiving it next week. 

Regardless  there are several vendors mentioned that can do this.  PS  Decware is 6 months out, last I knew.   I am getting mine in about a month. 
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