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
Thanks for the advice. I will hang in there for at least 300 hours before I decide to change anything. Sounds like it could be the NOS Tung-Sol tubes. I will keep my eye out for some Bad Boys.

-Donn
Has anyone heard the difference between the stock preamp and one with the cap mod? If so, what was the greatest difference that the mod delivered? Bob
Thanks to Teejay I am now a proud owner of ASL Flora. It sounds every bit like its been described in the review. I'm using NOS Sylvania chrome domes but will upgrade the stock power cord and capacitors. I have one question though, my unit looks exactly like the one reviewd in enjoythemusic.com, but its ASL FLORA EX not EX DT.does anyone know the difference betwenn the 2 (if any)?
Congrats A ahlan, on your new Flora. I hope you get as much pleasure out of yours as I do having mine in my system.

To answer your question I do not believe there is any difference between a Flora marked EX or EX DT. If you have not had the caps upgraded to the Mundorfs A ahlan, you have yet to hear what this preamp can really sound like, so I strongly suggest when you can do the cap upgrade and let us know what you think.
It's been forever since anyone added to this, but here's my $0.02. I have had mine for months now and have played with isolation and with different 6sn7's.
My previous preamp was a Viva Linea with the optional 300B power supply, using Sophia 300b's. I never thought I would be able to do better, but I got flooded and needed the scratch, so it got sold to a very happy European.
As to the Flora, here it is - TAKE OFF THE TOP!!! This preamp needs to be exposed to really open up - pun intended. The best 6SN7's I have found are a pair of Nanjing 6N8P no longer in production. This is after Sylvanias, EH's, VT231's, and even the vaunted Russky 1578's with the holes. I did my research, and then tried the Chinese tubes on a whim, due to the fact that they have metal bases and were for sale cheap. Holy Valve, Batman! they were like the Russian "Holy Grail" 6H8C's but with a cleaner lower midrange, making them very clear, dynamic, spacious, musical, and tonally accurate. I despair to think of these tubes ever wearing out - I will never find another pair.
This preamp also loves to float in air, either on springs, like the mattress springs being passed off as specially designed devices, or on the Spike-Will Magnetic isolators.
If you have this preamp, you owe it to yourself to at least take the top off, and if you don't have anything to float it on, try a pillow, just for fun. Then call me crazy if you want to.