Review: Antique Sound Labs Flora EX DT Line Preamplifier Tube preamp


Category: Preamps

Before I get to the review of the Flora EX DT Linestage I would like to share some background information regarding my year long odyssey doing home auditions of some very highly regarded tube based linestages. The reason for this to give a context of what I was looking for when listening to these different pieces.

I had lived with to great passive preamps, that had replaced a ML-32 reference, the Placette Active(buffered,no gain) and Bent Audio's great transformer based Tap linestage for the last three and a half years. My personal taste for certain audio "flavors" would be reflected in the choice of a TVC passive linestage:

1) An absent noise floor were music just floats out of a black background into my listening space.

2) Natural timbres, I listen almost completely to acoustic jazz, so I want trumpets to sound brassy and a bass fiddle to sound different then an electrical bass.

3) I find clarity/transparency very important and believe it is an important aspect for allowing leading edges of notes and microdetails to be present in the music.

4) Full extension of the top and bottom, and that the lower bass be quick and not "plumy" or rich and fat.

5) Layering in the sound stage with "air" around the players without bloating the players into oversized cutouts.

I thought it was important to share what I'm looking for sonicly in a linestage, along with system synergy, because the three linestages I auditioned have recieved stellar reviews and other GON members I'm friends with have them in their systems and love them. So, are we clear, no "shoot out" or the best with a capitol B, just a perspective of how the Flora sonicly fits in with this group of linestages.

So, I was very curious if I could keep the sonic virtues of my beloved TVC based TAP and get some of the "magic" that tubes can offer at the same time. Here's a brief rundown of my experience with these different pieces.

1) Shindo Labs Monbrison-Found this linestage quite average in its performance. Did nothing very good or very bad in my system. It was OK but not better in any way then the TAP, yet it was more then $4000.00 above the price of the TAP!

2)Joule Electra 150 MK2- This linestage was just given a golden ear award by Harry Pearson. In my system it offered what I would call a overly "lush" sonic perspective that put my system to sleep. It also had a very apparent lower midrange or upper bass "hump" that I found annoying as time went by.

3) Modright 36.9- This linestage almost won my sonic heart because it offers many of the sonic attributes I was looking for, however it fell short in two areas compared to the TAP TVC. It was not quite as transparent as I was used to, but quite close. It was wonderful at not being "fat" or over the top with warmth, but was great with the body and decay trails of notes, but fell a little short with clarity on the leading edges. Almost a keeper!

Well, I decided that active tube linestages just were not my cup of sonic tea, and then I read on some website about this very different linestage that was active but used autotransformers like a TVC, but used one active tube based gain stage, before finally going back into a transformer-coupled output stage. Maybe, the best of all possible worlds?

The ASL's Flora EX DT linestage is a massive large black box, it's weight is 35 lbs.,and is very well built. It's surely not "eye candy" but its not exactly an "ugly duckling" either. You can reverse phase or mute either from the remote control or on the front of the Flora.

As far as what makes this linestage unique from a design veiwpoint is the following. The absence of any type of potentiometer volume control. Instead it uses a autoformer/switch-based input stage, into a single triode gain stage, and finally to a transformer-coupled output.

The importer highly recommends, a ASL installed mod of Mondorf capacitors to replace the standard large coupling caps. I ordered mine with this upgrade, cost $250.00, along with replacing the two tubes sourced from China with two NOS Sylvania 6SN7WGTA 1958 Chrome Domes.

Well, not only did the flora give all the sonic virtues of my Tap TVC that I mentioned at the begining of the review , but it added the following:

1) The most remarkable sound stage with the greatest depth I have ever had in my system, but with 3-D sense of a "air" around each player and layering that was precise and natural.

2)The best timbres/tonal accuracy of any preamp I have ever listened to.

3) My whole system became more "alive" and dynamic yet at at the same has more liquidity then ever before.

4) On macrodynamics the sense of scale/attack is very lifelike and yet the body of notes is still full with wonderful decay trails.

Wayne Donnelly reviewed the Flora on www. Enjoy the music. com and just gave it a Best of 2007 Award. Here's his explanation of why this $3000.00 linestage competes with mega dollar pieces out their today.

"Its sound presentation is tonally accurate, harmonically complete, and outstanding in creating a broad deep spatial rendering of the recording, with startling degree of palpability and precise location of voices and instruments within the sound scape.... the best-sounding preamp this writer has heard. In fact much of the Flora's real competition comes from top models in the five-figure price range."

The flora is my new reference linestage. I would recommend that anybody looking for an active tube based linestage consider it for audition, I consider it a bargain even with the CAP upgrade at its $3000.00 price. Remember I did not say it is the BEST linestage, but a terrific one that is on the same level as world class reference pieces at a very reasonable price.

Associated gear
Click to view my Virtual System
teajay
Hello,
I too have a Flora with the cap upgrade and mine has only about 50 or so hours on it. I have already replaced the tubes with a pair of Tung-Sol (not the black glass but the chrome tops). My question to you is how long did your break-in process take and also my system is sounding a bit thin since I put the Flora into the mix and was wondering if that will improve.

Thanks for your info and help.
-Donn
Hi Donnwags, hope you are enjoying the Flora in your system. To answer your question, it took about 200 hours for the Mondorf caps to really burn in and for the Flora to completely come "on line" and really sing.

I don't know what Tung-Sol chrome tops sound like. Are they NOS tubes or new versions of the original tubes? I'm somewhat surprized that you are experiencing a "thinness" in the overall sonic signature in your system with the Flora, even before mine fully burnt in, it offered wonderful weight and body and just got smoother with more liquidity as the hours went by. I would also be interested, if you would share, what the rest of your system has in it, so I would have a context regarding what the Flora sounds like in your system. Finally, I tried a couple different power cords on the Flora and found that my Harmonic Studio Master gave the most improvement, so are you using the stock cord? If not what PC are you using.
I am using a TG-Audio HSi power cord right now. I have found this to be a good cord for amps and preamps alike. Do you believe that the NOS Tung-Sol tubes could be the issue? What did the orig tubes sound like? I think I might try them and take a listen for as it stands right now I have close to 100 hours on the preamp and it still sounds thin and the music has very little density to it (compared to my other preamp an AR SP-16). Thanks for the help. Are you using the Sylvanias? What differences did they make?
Donnwags, yes my hunch is that that the lack of density or body you are experiencing, unless there is some other malfunction in the Flora which I don't think is very likely, is the tubes you are using.

The original tubes were pretty crappy, lack of details, lack of extension, lack of liquidity, ect., my first replacement were NOS Sylvania 6SN7 WGTA 1958 Chrome Domes, that sounded terrific and I thought that was the end of my tube rolling. Well, then my friend Bob was raving about what happened in his system with NOS Tung Sol blackglass oval plates in his preamp. In the Flora these tubes are just magical, everything got much better, for details go back up to my report on this thread regarding the sonic details, my whole system took a step towards the illusion of real music.

Could it be that the type of NOS Tung Sol that you are using are very different sonicly then the blackglass oval plates, or maybe they are not at full strength?

So, I don't doubt your experience at all Donnwags, I'm just surprized that it's happening in your system. The NOS Sylvania Chrome Domes are an easy tube to purchase and are relatively inexpensive, around $200.00. The NOS Tung Sol blackglass oval plates are getting very rare, I was luckly enough to get another matched pair for backups, but both my pairs were expensive at $450.00 per set.

So, I hope this helps, good luck trying some other tubes, if it does not work out and you decide not to keep the Flora send me an E-mail because I have a couple of friends who would be interested if you would want to sell it.
Donnwags:
I did not like sound of Flora in the beginning so I changed stock tubes to "Bad boys". Things improved a lot but Flora really start to sing after 250 hours of burn-in. It was bigger improvement in my system than changing tubes. I guess that Mundorf caps need more than 200 hours to show real potential - in my case it took almost 2 weeks (7/24) of breaking-in. If after this time Flora sounds thin, I guess, something is wrong with the tubes or unit. My Flora never sounded thin, not even with stock tubes. It is superb pre-amp. Give it more time, you will like it.