Spatial Audio Raven Preamp

Yes I think I would try the Linlai tubes.   Your system is fully balanced, so the Raven should shine there.  Please do post a review when you have put a few hours on it.

@terrapin77 

Yes, please let us know how the Raven mates with your system and your impressions.  It will help others get a data point on a new product that is finally reaching production after 2 years of development.  Spatial is starting to crank them out now.  They are all hand built and point to point wired and they do take time to build.  I believe they will have a 45 day return policy, with little or no restocking fee if you pay the shipping.  So I suppose one could try one relatively risk free.

I use one, and I find it is totally transparent, but I am totally biased:)

cheers,

Don

@jc4659 I am using the Shuguang flagship WE6SN7plus in mine.   They are finally back in production.  That will be the base tube going forward.  The hand selected Linlai E-6SN7 is more expensive and the upgrade option.  I would say they are both just superb tubes.  The Shuguang is a bit warmer and has almost all of the detail and air of the Linlai.  The Linlai has a tad more air and is a tad more neutral.  That isn't to say the Shuguang is syrupy or the Linlai cold.  You would be happy with either, but if  your system is a bit bright, then pick the Shuguang, and if your system could perhaps use a bit more air, then use the Linlai.  Both are just wonderful tubes.

You have to realize that I have a Lampi Pacific 2 DAC, the matching Blackbird 300b amps, and some amazing open baffle speakers so my system allows me to hear even subtle differences between tubes.  If you had a more pedestrian DAC and amp and speaker in the chain, then the differences would be masked.  The point is that the Raven is totally transparent to my ear and will let you hear everything in a way that most preamps cannot.  My 2 cents, and yes, I am totally biased since Lynn and I designed it!

What Lynn said about coupling caps is true.  I have gone through most of the best ones in various designs, and they can sound good to very good.  But the entire Revelation series we designed for Spatial has NO coupling caps from the input to the preamp to the output of the 300b amps.  When you eliminate all of them the sound is quite remarkable.  Provided you have REALLY good custom transformers, specifically designed for their application, and we do.  The Raven preamp will actually drive a 600 ohm load, so a 5K power amp is nothing to it.

@jc4659  Yes, please do.  What amps and source(s) are you planning on using with the Raven?

@jc4659 I see your phono stage also has xlr output, so you can run a fully balanced system, even with phono into the Raven, which is great.  I would expect it to work well in your system.

@terrapin77 Thanks for posting.  To me, qualities of the Raven are transparency, tonal correctness of instruments and voices, and that ethereal sound stage.  The absolute blackness helps with all of that.  It doesn't really sound like anything except the music.  The Blackbird 300b amps have the same sonic signature, or rather lack thereof.  It is very different than what you are used to listening to, but you adjust very quickly and then nothing else sounds quite right:)  My old preamp and amps, which are quite good, sound veiled by comparison. 

@jc4659 I can assure you the preamp sounds believable.  The sound stage is entirely dependent on the recording.   On most every recording except mono ones, the image in my system using the Raven and the matching Blackbird amps will always extend several feet outside the speaker boundary with good depth.  Smaller sounds are physically smaller and things that are farther away are rendered that way.  On other recordings, the music will extend towards you and partially wrap around to the sides.  I use the analogy of omnimax theater for the ears.  Again, it is totally dependent on the recording.  I will get in trouble for saying this, but I will say it anyway.  My experience is that solid state amps tend to flatten the sound stage just a bit and make it more two dimensional.  I am sure there are great SS amps that don't do this, but most of the ones I have heard have this effect, at least to a degree.  A very competent tube amp generally is better at a 3D soundstage, provided the speakers are tube friendly.  Of course YMMV.

Thanks for the kind words!   Working with Lynn has been a pleasure and I have increased my knowledge of tube circuits considerably since I met him..   He got me to consider "going outside the box".  The Raven and Blackbirds are about leaving the box.   Paradigm shifts are always healthy, or at least the consideration of them.  I have built or restored a LOT of tube circuits over the years and nothing I have ever heard or built or restored can touch the Raven and Blackbird sonically.  I think a lot of that is due to what Lynn discussed above about all the very subtle spatial cues that can be lost with lesser electronics and speakers.  I hear things with the Raven and Blackbirds that I have never heard in any stereo before.  Those who have heard them agree.  They don't sound like what you are used to hearing.  They push through boundaries.

As for reviews... we are working on it.  The final production versions of the preamp and amps are just finishing.  These include new cases from a different woodworker.  We didn't want to send out review units that did not look exactly like the final product.  Sonically the gear has been stable for a while, but the final cases had to be sorted out from a reliable supplier who could meet our demand.  That has happened and a set for review will be finished in the next month or so.  We have made arrangements with Positive Feedback to send them a set in the fall, and expect a review by the end of the year.  Of course we hope that owners will chime in as on this thread.   

Lastly, I don't know what shows we may attend, but I am pretty sure there will be a special demo in Portland for the Oregon Triode Society.  Maybe in August or more likely in October.  We will have a large room for two full days with the Raven and Blackbirds, and of course Spatial Audio Lab speakers.   I will be there along with the Spatial team.  So if you are in the Portland area, or perhaps want to make the trek from Seattle, you can hear the preamp and amps paired with top end gear in a good room without all the buzz of an audio show.  When we have a schedule we will let everyone know and hope to see some of you in a relaxed setting where we can all hang out and listen to music!

@sjsfiveo Yes, price has very little relationship to sound quality beyond a certain point.  One walk through an audio show will make that abundantly clear.  The Revelation series project was about designing the best sounding preamp and amps that we could using ideas that Lynn has been working on for decades, that have their basis in wonderful circuits and approaches developed a LONG time ago.  We implemented those ideas with modern power supply, filament supply, transformer, and attenuator technology that I had been using for a number of years prior to that.  The idea was to build the best sounding preamp and amps we could and then price them based on the build cost and required profit margin for the manufacturer to stay in business, while paying real technicians in Utah, real living wages.  You really cannot build gear of this quality on a shoe string budget.  That said, the gear does not cost six figures, nor does it have to!   

I want to revisit what Lynn said about subtle content that is present in two channel recordings.  The content that gives the ethereal sense of space, and the very subtle reverb that is present from recording techniques or actually added by the producer.  I have owned really good stereos for years, both rebuilt vintage-based, and my own creations.   What the Raven (Revelation) preamp and the matching Blackbird amps do is to present this information.  It is not masked as in most systems, including some very good ones I have owned, and some very expensive ones I have heard at audio shows.  I am listening to the final versions of the Raven and Blackbird amps, and I hear these things that I have never heard before in recordings I am very familiar with.  It adds a whole new level of enjoyment and has been discussed, you can hear the intent of the musicians and the producer or recording engineer, and the room if the recording is from a live performance.   

The shoebox mono prototype amps mentioned by @sjsfiveo ​​​and ​@whitestix will give a portion of this effect and are very good.  The final version of the amps have it in spades.  We have improved both the preamp and amps just a wee bit since the Dallas show and I am looking forward to the next demo of the Revelation series so that others can hear what I get to enjoy in my living room daily.   I completely understand that a $19,995 pair of amps is outside the budget of many folks, but I do thoroughly enjoy playing them for people so that they can hear what is possible and what we have been up to.   Most people (myself included up to two years ago) have never heard this sort of presentation.  From a design standpoint, I understand exactly why all of our choices work well with this circuit idea, and why the system sounds as it does.  But hearing it is quite astounding to me.  It just vanishes and leaves the music hanging space for you to enjoy.