Review: Tube Research Labs Dude Tube preamp


Category: Preamps

This review is on the Dude tube preamp made by Paul and Brian Weitzel of Tube Research Labs (TRL). I purchased this preamp some 7 months ago direct from TRL which is how they market and sell them. The price is $3500. The unit has 5 tubes total with one 6sn7 tube per channel.

I am not a technical person and can only comment that the unit is very heavy, all point to point wired and contains a forest of caps the size of Red Bull and Coke cans!

The Dude also benefits from TRL’s newly designed power supply which is something very special indeed. It comes with two sets of outputs and three inputs – all RCA. I think Paul can work out XLR’s if you desire, but you would have to ask him. My unit has special wooden knobs which I prefer over his high quality gold ones.

The unit is turned on by a breaker switch on the back on the unit. The Dude does not incorporate any fuses, simply the breaker, for improved sound. The chassis is well built and solid in terms of fit and finish. While it is not eye candy, the Dude offers a simple attractiveness.

I must have over 700 hours on my unit by now and it is fully burned it. I have found this preamp responds very well to tube rolling. This review is based on the use of RCA 6sn7 GT’s ,VT231 with smoked glass. I picked up 6 of these for $130 on Ebay and just love them in the Dude. Paul likes Raytheon NOS’s, but I have not tried them as yet.

I like female vocals, Christian contemporary, jazz, piano and acoustic guitar instrumentals as well as some small ensemble Classical. You can also read my review of the TRL Samson amps for more information of my musical tastes.

As you have noticed I have owned and heard many great preamps over the years. The Dude has far outclassed each of them in virtually every important performance area. I particularly liked the Audio Horizons and Tube Distinctions preamps on my list. The Dude simply recreates real music in my home well beyond these other fine units.

The level of transparency is utterly shocking. Details and musical lines previously hidden now come alive and my music sounds brand new to me. I was amazed at all the instruments and notes I was missing in my recordings. What a revelation and joy to me as one into this hobby for 30 years.

Right now I am listening to solo acoustic guitar by Phil Keaggy and am consistently astounded with the additional pic, string and guitar body sounds completely hidden before. The sting plucks are so much more distinctive with every molecule of nuance presented to my senses. This is true at even the lowest of volumes on my system. Magic my friends and I mean magic!

I have never known any preamp to dig as deep, taunt and powerful in the bass region as the Dude. Bass has incredible impact, drive and articulation. Easily the best bass I have yet to encounter in a preamp. This tube preamp will shatter your preconceptions of tube preamp bass performance. Bass is no longer this vague sort of deep running tone, but rather a distinct and articulate portion of the whole performance.

Tonality is so beautiful and right. Not a hint of listener fatigue to be found. The massive amount of detail is delivered with exquisite beauty, body and soul. Don’t we all want that? The Dude does both in a way I felt was not even attainable. Tonality is vitally important to me. Voices have weight when they should. Like the guitar work nuances mentioned above the human voice is rendered absolutely and completely naked before you. You will hear aspects of your favorite vocalist you have never heard before. More air, more texture, more nuance, more personality – just amazing.

The Dude sets the stage big, wide and deep. First time I have heard stage depth so profoundly obvious. I now get a sense of what some reviewers mean by 3D! Life sized performance is a consistent attribute of the music flowing from this preamp.

I like to listen to very loud music at times. I like the live scale it gives the recording. The Dude is always in control and supremely poised. Nothing, no part of the audio spectrum is ever out of balance or forced. I hear a new standard of performance in terms of effortless, uncompressed music.

My system seems to have infinite room filling abilities. This is very, very important to me. Even at very loud settings music must flow not attack! The Dude is a complete gentleman in this regard.

Highs seem to have no ceiling or cap as they extend smoothly and without any hint of hardness. I am very sensitive to bright or hard highs and will quickly box up a unit if I hear a trace of it. Yikes! The Dude is a smooth operator and does so without robbing music of the precious detail and air we desire.

Well, I could go on much longer as the Dude is a revelation to me. It is the heart and soul of my current system and really makes everything sound so real and right.

I hope my words were able to convey what I experience with The Dude.

Have fun!



Associated gear
Please see my member system.

PBN Montana EPX custom speakers
TRL Modified Sony CD player/battery
TRL Samson amps
Audio Horizons cable
TRL Cables
Star Sound Sistrum stands
Echo Buster room treatments
SVS PB 12 Plus/2

Similar products
I have owned or had these preamps in my home system.

Audio Horizons TP2.1 fully loaded
Joule LA100 MKIII
Conrad Johnson LS16 V2
Thor 1000 MK2
Tom Evans Vibe
Supratek Cortese
Supratek Syrah
Audio Note m5
Wavac PR-X1
Rowland Concerto
Cary SLP98
Aesthetix Calypso
Tube Distinctions SoulMate
Placette passive
Wright Sound WLA 12A
Aloia 11.01
Belles 21A
Rogue 99
grannyring
Bill, not sure about that one. My Dude lounges around on the couch in his effortless existence. He does not have to try hard like so many other pre-amps....
I want to let you Dude owners know that I sure miss my Dude. I am waiting for my new unit and feel like my spouse has gone away and left me lonely :-)

I swear I could sing a blues song right now as I listen to music. My stand-in preamp is very good, but I miss my first love.

My Dude must be a woman - right? Tell me the Dude is a lady. Please.... The Dude does not look like a lady however. Goodness.....
Yeah, that is good news. I told him to fill a bomb shelter with Samson parts....
Paul says he has reconsidered and decided to continue and make Samsons after the outcry when he said he would discontinue them. He also has ordered enough electronic components to build and service them for the next 20 years.
A very mint pair of PS Audio Delta 250 mono-blocks I found on here but sold by a local who was original owner. OBM and not a scratch on them.
About 200 hours and counting. Added some Triode Wire PC's to the amps and that increased the pleasure meter some as well.

Samsons may be completed in 2 weeks per Paul.
I made a Lexan cover for my Dude today. I was worried I might scratch it trying different cables so I made thin cover to sits over the top and clears the bolts.

Ordered my Samsons Thursday. Paul said it would be a travesty not to get a pair in blue.
He loves it. Better in all areas but cannot name names out of deference....
I wonder if he likes it??

What high $$$ unit has the Dude gone up against and was as good or better in all areas?

Mine are Audio Note M3/ Red Wine ISAbella. No contest.

Would like to know how it did next to the Arc 40 year Anny. unit.
Hey everyone. Check out Miguel's Dude: http://cgim.audiogon.com/i/vs/i/f/1300480343.jpg

Righteous....
Dual Shallco attenuators and the selector switch.

I think I have 6SN7's but will have to verify.
Pat, the dual volume control is an additional option that costs $ I believe.

Tthean, I waited a month and a half. Average wait time seems to be more in the 2-3 month range. It depends on if you order specials colors, 3 inch face plate, etc. You have to remember that no printed circuit boards or pre-fabricated chassis are used here. It is an artisan piece that is point to point wired in a chassis that makes previous pieces I have owned feel like a coke can. The newer Dudes with the 3 inch face plate are weighing in at 75-80 lbs....
It's been a while, I'm looking at dual volume controls or am I missing something? (owner of a Dude)
Bluebug,

Are you wired with 12sn7? If so get the RCA 12sx7 tube. It will kill the ones shipped to you.
Bugredmachine, how long have you waited for your Dude?
Tthean 03-16-11

Well I waited an inordinate amount of time - 6 months. Paul had to find a new plater/anodizer due to economy, etc. last year and once he found one they kept having troubles as they were running his stuff on 3rd shift. Then there were delays when his Dad took ill in a town far away. Then winter hit them and us and their queue was big. But I kept in constant contact and always received a response from Paul. Many phone calls and bits of progress.

They finally got the anodizer to do their stuff first shift and they resolved the problems. This whole time the chassis was finished and circuit up and running, just w/o the sides and top panels.

Worth the wait for sure but you won't have to wait as long as I did.
Bug,
It's just a beginning of the good things and good things will come for the next few months I'm sure. I think mine settled after about good 6 months or so and the biggest jump was after about 600hrs.
Bug, that is awesome. You are hearing what we have all heard. I am not an aggressive evangelist by nature, but the Dude bowls you over and you cannot help but share in the sheet giddiness of it all....

The Samsons are also staggering. The synergy is to die for. It is a no brainer....

Sgr, go for it....

I too am jealous of that blue chassis.
I can't wait to order mine. Keep us posted. Your blue Dude looks fine! Haven't decided on the color of mine.
I am amazed at the initial results within 2 hours with low end 'amperage' and a DIY IC slammed in there to just get the system back up and get some tunage. You used the word "musical" and that is exactly what I hear. The sound is so gentle and revealing - graceful may be the best terminology. It's just stupid, but I actually do hear MORE detail of what is going on in the music but it is not forced at all but just laying out there to grab.

I'm in a hurry now to get some better amps. I have some new IC's coming and some new PC's to try. And the tubes in the Dude are temporary according to Paul as he awaits shipment of the new supply. I believe I have some RCA's in there right now.

If the Samsons are half as good as the Dude I may have to retire early and become a hermit in my man-cave.
Bug,

Yes, you will soon know how special the Dude is as it simply sounds more like music then any other pre I have owned or heard. I love the finish and look of your Dude also. I purchased a new Dude also and mine will be Candy Apple Burgandy red!

Paul is building mine to mate with my new low impedence amp and Soundlab speakers. I think my Dude will be ready in 2-3 weeks or so.

Keep us updated as the Dude burns in. I suspect you will love it more and more.
Are you kidding me? Wow!! Right out of the gate - clarity, depth, separation, and dead quiet.

WOW!!! And I'm using 10+ year old amps as a stop-gap.
Bug,

Those 750's have a very low imped input rating. The Samsons are a great match for the Dude. I would check with Paul on the Dude and 750's mating well as the 10K ohm rating is very low indeed.

Yes, your Dude is the best looking one I have yet to see. Very nice.
Sgr, nice room BTW. I agree with you 100%. The room is the most important component. We will be finishing our basement in the next 2-3 years, and I have a room design in mind. We are having kids soon, so soundproofing is essential.
Bug, your Dude looks spectacular. I am generally low key about equipment aesthetics, but I did briefly covet your Dude.

Sgr, time to completion of order is variable depending entirely on whether you upgrade the faceplate, alter the color, etc. The machine and anodizer shops are the rate limiting step in the TRL equation. I got a plain jane Dude and it took a little under 2 months.
Samsons are at 68kohms impedance. So I would guess amps at 50kohms or higher would be okay.

Sgr - go for it. Paul has a new anodizer and finally can get things moving which means other colors for those that ask.

I uploaded a few more photos of the preamp into my system just for you guys to see.

McCormacks are at 10kohms.
Bug

I know your considering the fine Mccormack 750 and I just remembered something.

Check the input impedence rating as if I remember correctly, it may be pretty low - around 20K ohms or so. I am not around a computer to check - using my Bberry now.

That is pretty low and confirm wth Paul if this is fine.

I may be wrong...
So how long does it take to get a Dude once you've sent the $?
Bugredmachine,
That blue looks so cool would you mind if I imitated your color Selection?
I'm not going to wait. Pulling the trigger on something this week. Getting closer to a decision.
The Dude Abides!! Yes, the crate lost it's "feet" but the unit is intact and beautiful. Sitting on the dining room table waiting for me to spring for some amplifiers.

Damn thing is HEAVY! Built like a tank and the knobs have great feel. Cool amber light behind the selector switch.

Paul included 9 CD's of high rez tunes in the box.

Sound? Who the hell knows at this point. And it will be at least 10 days before I know unless I drag out a surround amp from the theater and try those 60 watts on my system before that.
I've read this thread, and am intrigued. Any ideas how the Dude would mate to a McIntosh MC275?

Thanks,

Tony
Glory - while we can all acknowledge you are an ardent supporter of TRL products and given I have no personal experience with them, I am now somewhat interested in researching them out. I have found that anything touted as having the capability of "destroying" something actually diminishes the credibility of the post but I do appreciate that forum input does give us an introduction to components that we may never have heard about...
I have not been able to hear a 40th Anniversary preamp. Nor could I afford it. But I recall how special the SP-10 was compared to all other preamps at the time. Owning the REF 3 and being very familiar with what SP-10 could do, I'd almost be afraid to hear an Anniversary edition. It should be an outstanding preamp with the pedigree it has. That the Dude is even comparable, and competitive from the hints I'm getting about the sound, speaks volumes.
Steve, I would call Paul W for more explicit details. The Dude has gone up against some top $ pre-amps and done well. You have to remember that TRL has been in business as long or longer than some of the bigger names you mentioned, and is not a johnny-come-lately outfit.

Have you compared the ref3 to the 40th anniv piece?
Grannyring and Agear,
I previously owned the Levinson Reference #32. But I had a chance to audition a REF-3 in my system, and liked it much better. It had a live quality that the Levinson did not have. So I purchased it. I have a friend with a Gryphon Sonata Allegro that sounds great and has the many of the best qualities of solid state and tubes. I've seen and read about the Dude on Audiogon and it sounds like a great preamp too. ARC preamps especially the REF series, seem to be one of the standards used across the industry by which other preamps are measured against. That is why I wondered with all the great things said about the DUDE, how it would compare to the ARC. I do wish it had a remote control.
Yes, I would be interested in hearing how the new ARC Anniversary preamp would sound vs. the DUDE. I would be even more interested in others who have owned other SOTA preamps including solid state, like the Rowland Criterion, sounded compared to the DUDE.
Thanks,
Steve
Vett93

I have used many of Mapleshades products nd they are fine. However the Sistrum SP004 stand is very special under the Dude.

They do show up used for $150 or so.

Nice step up.
I have not. I have used both Herbie's tenderfeet on a dedicated rack as well as Equirack footers. Both are good.
Has any Dude owner tried Mapleshade Heavy Footers on a maple block? Does Dude work well with Mapleshade products?
Paul has a great sense of humor. His LinkedIn job title is Janitor at TRL.

Dude is in FedEx's hand at the moment!
Yeah Sutts, the LL is a funny name. Interestingly, the Little Lebowski has morphed into a transformerless OTL amp. This will be a TRL first from what I understand. Should be interesting. Gary Anderson (aka Glory) will be the first recipient.
Last time I spoke with Paul, he mentioned this new SS amp, interesting name- 'Little Lebowski'- I got a kick out of that!