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Audio Research has been using it for years. I have had it an LS26 and now my REF5, and find theirs to be the easiest to switch to. I looked at other brands and they have it, but complicate the switching from 2 channel to unity gain. Audio Research just lets you press "proc" on the remote un-mute and your in. It automatically mutes when you press it. As a longtime McIntosh owner, their instructions, to my understanding, call for turning the unit off and on in processor mode. I think Cary is similar.
if looking used, and LS26 or Ref3 have it, I am not sure about prior units.
A used Musical Fidelity X-10v3 tube output buffer.
"If you want that tube warmth"
Yes this is good but you need to also get a passive VC (volume control) before it. More $$$
Musical Fidelity have the same circuit in their Xcan-V3, but with normal size tubes, not the mini 6112 that are in the X10-V3.
But you get with the Xcan-V3, a passive volume control built in, and a headphone jack as well.
So this Xcan-V3 has all you need, but both units do have just a touch of gain (1 or 2db) above unity.
Why not have a custom SET- DHT preamp made for you ? I have a SET with only
1- stage is by far the purist active stage you can get .100% Transformer coupled
Lundahl, orMonolithe , Tango,or whatever your budget could afford . Myself 5 transformers ,3 choke filter supplies ,all 4- pole output caps and bypassed with MundorfSilver oils the latest Shunt,relay remote from Khozmo. No coupling capacitors at all in the signal path.
Amorphous core Audio output transformers , Silver if your budget can go the extra $2k Mile. Something to ponder though the Russian 4P1L tube is considered by many one of the most linear with lowest plate resistance but still have plenty of gain . Did you know the Vast majority of preamplifier have 2 ,or more stages
indirect triodes .mean double the circuitry,and wiringplus regulators . You would have to spend well over $10-15k what this DHT can accomplish in purity for $6k.
No commercial markup .myself being in the Audio business before know the production markup and only 25% of the cost at most goes into the product ,including the case. Custom over 70% goes into the build and the parts quality
is Much higher - premium quality.Nothing was spared in the build process. Longevity,as well as lower distortion is the
final result of precision hand built engineering . It took me over 30 years to except
this fact but true .Amplifiers are another animal all together they are Loudspeaker dependent .