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AUDIOVALVE Challenger & Eklipse review
by Ken Kessler in ULTIMATE-AUDIO
(Oct. 2000)
Cliche's abound when it comes to German manufacturing,
and they're clichés because
they're true. From Braun shavers to Leica cameras,
there's a consistency, durability and
desirability which maybe only the Swiss can match.
(Hell, they don't call the Swiss ,,mountain Krauts" for nothing.) The AudioValve
components, though, reflect a different
sort of Teutonics, and it's neither cars nor cameras
which they mirror.
ULTIMATEAUDIO
A colleague of mine - a Swiss-trained watchmaker,
with a passion for Nagra and Revox open-reel tape decks - pointed out to
me that there was a peculiar ,,Germanness" to the latest field of endeavor
at which they excel: the manufacture of high-end wristwatches, previously
the sole preserve of the Swiss. Not being a watchmaker myself, 1 can't caim
that 1 knew what he was talking about when he simply looked at a photo of
a new Lange & Sohne watch and said, without prompting, ,,How very German
it is." He then went onto
describe a heaviness to the case, design frills which
were purely decorative rather than
unremittingly functional - hardly what l expected
him to say when ,,Germanness" to me
means the Bauhaus cleanliness of the Audi TT or the
pure functionality of a Leica M6. But he was right, and he
showed it to me in other
German watches. Now 1 see it all over the AudioValve Eklipse pre-amplifier
and Challenger monoblock power amps. ULTIMATEAUDIO
Thus, you can forget the ,,regular" German gear you
know. These pieces have nothing in common with the Munich Airport look of
Clear Audio turntables, all chrome and glass, nor do they serve as tube
equivalents of the über-high tech sleekness of Burmester designs. If
anything AudioValve's look is a throwback to the Weimar Republic. Prussian
helmets, handlebar moustaches - subtle it is not. The Eklipse, though a
thoroughly modern preamp, looks like it was designed by someone who
apprenticed at Maybach. |
Open the wooden packing crate, and the first thing
you notice is that this just may be the heaviest two-channel pre-amp on the
market. Unless my bathroom scales are 0ff, the Eklipse weighs a serious 331b.
And yet it only occupies a space of 16.5x12.25x5in (WDH). As the see-through,
318in
thick plexiglass top plate shows you, this all-tube
design is so tidy that there's a lot of free space within - so what contributes
to the weight? ULTIMATEAUDIO
Externally, the Eklipse is not subtle. Four massive,
gilded knobs fill the front panel, one each for output select, source select,
volume and balance. Below the first two are arrays of colored LEDs to show
you which output and source were selected, the first set also flashing during
warm-up. Additionally, the source and output selectors have positive detents
and the silkiest, sexiest action of any rotary controls l've ever
used. ULTIMATEAUDIO At the extreme right are the on/off switch and a sensor for the remote (not supplied with the review sample, but operating all functions including stand-by and mute). So far, so solid, the case itself consisting of glossy metal panels made from laser-cut 5mm sheet steel, used for both structural integrity and to assist in AudioValve's drive for a pre-amp immune to RFI and unwanted noise. Confirmation was instant: this is one seriously quiet pre-amp. The side panels slot into a chunky extrusion at each corner, each fitted at the bottom with a large gold foot. Another nifty detail? Each foot has a soft insert, like the nonwiry part of a Velcro strip, to ensure that no shelf is damaged. At the back are more military-grade fittings, including an IEC three-pin AC mains input, a pair of XLR balanced outputs, and 10 pairs of sturdy gold phono sockets for outputs 1, 2, tape, and seven inputs marked tape, tuner, Aux 1, 2, 3, and CD 1 and 2.
ULTIMATEAUDIO Looking through the slotted lid, its openings directly above the four 6189/ECC82 tubes, you see one of the main contributors to the unit's mass: a huge, shielded 100W toridal transformer, which |
looks big enough to feed a power amp, let alone a
line level pre-amp. The entire circuit and all components reside on a
double-sided mother board which fills
the base of the unit; obsessives will probably not
get around to using the Eklipse for some hours after unpacking because the
vista takes in the sort of designer ingredients which cause swoons and will
distract them from their original purpose. Everything is mounted with immaculate
precision and care; the bank of sockets as seen from the inside is nothing
short of inspiring. ULTIMATEAUDIO
Dual-mono construction marks this product, the right
and the left channel each enjoying its own power supplies for heat and plate
voltage. The seven high level inputs offer different input sensitivities
and different input impedances, but - as the new, English owners manual wasn't
ready - 1 stuck with the CD inputs. Every input is switched by a relay, and
the Eklipse features something l've never seen before: move to Position 9
on the source selector and you activate the relay self-cleaning function.
1 did it by accident at first, not knowing it was there, and the flashing
lights and machine-gun noises nearly gave me a heart-attack. Designer Helmut
Becker recommends its use once a month, so hygiene fanatics - rejoice! (Practical
jokers might also use it on unwary friends, just to scare
them.) ULTIMATEAUDIO
Each channel uses a pair of tubes, the first for gain
and the second for the output driver for low (300 ohm) output impedance.
AudioValve chose the ECC82 because they feel it can't be overdriven. A nice
touch for anachrophiles is the use of NOS (new old stock), 40-year-old resistors,
chosen for their sonics and stability.* There's no feedback in the output
driver stage, so the company feels that cables will have ,,no influence on
the preamp in this sector." Suffice it to say, the system did seem immune
to cable vagaries, but I stuck with Siltech for the entire listening period;
1 believe that US editions use Siltech internally. ULTIMATEAUDIO Clearly an obvious pairing for the Eklipse is the Challenger, a parallel push-pull design with some decidedly interesting details. As with all of the AudioValve electronics, the unit features the company's |
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patented automatic biasing system, called the Automatic
Bias Regulator (ABR), which leads to some fascinating possibilities. Each
Challenger has two
power tube banks with three tubes per side, for six
tubes in total per monoblock. Furthermore, each bank of tubes has its own
completely separate power supply, with both banks are connected ,,anti-parallel"
above the transformer. ULTIMATEAUDIO
According to AudioValve, ,,This principle turns out
to offer a very high internal damping, and the big advantage of this is that
you don't use the dynamic of the curve of the tubes; instead the cathode
immediately follows the signal of each power tube. So the sound of the Challenger
is independent from the characteristics of the tube's curve." This results
in a series of different wattages for the Challenger according to tube type.
The user can install any octal-base beam power pentode compatible with EL34,
6550, or KT88 and so on. (The driver section contains two ECC82s and one
ECC83, which shouldn't be changed for other tube
values.)
ULTIMATEAUDIO
Think about it: the units come with a dozen of the
latest Sovtek EL34s, but anyone lucky enough to have a dozen NOS Gold Lion
KT88s, primo vintage EL34s, RCA 6550s or even Gold Lion KT77s can really
go to town. Depending on the tubes you select, the amplifiers will deliver
between 110W and 140W. The most l could muster for alternatives was eight
KT88s and four KT77s, so 1 had to stick with the supplied tubes, but 1 can
just imagine what the Challenger would sound like with original M-O Valve
glassware. ULTIMATEAUDIO
Remember: with the Challenger there is no need to
adjust the bias, because this is handled by the circuit. Next to each tube
is a red LED which glows in stand-by mode, shutting down when the standby
switch is set to ,,on". Should a tube ever veer from its correct operating
range, the LED glows, telling the user to replace it. As it only takes a
minute to remove the plexiglass lid, tube changing is a
breeze. ULTIMATEAUDIO
Each Challenger measures 8.Sxl7xlOin (WDH) and weighs
551b. Here, too, we see massive construction, with laser-cut, slotted metal
sides, a metal cylinder at each corner with slots for the side panels, and
the aforementioned plexiglass top held, like the Eklipse's, by large
finger-releasable screws. The front has the on-off and standby rocker switches
with blue LEDs to indicate status, while the primary mains switch is situated
at the back, along with an RCA phono input, an XLR balanced input, and two
pairs of WBT binding posts to allow matching for 4, 6 and 8 ohm speaker
loads. ULTIMATEAUDIO
Should you disassemble a Challenger, you'll note the
cleverness which produced such a compact amplifier. Just as Mercedes A-Class
was designed to be tall and narrow, using the normally wasted space under
the passengers' seats for assorted chores, so, too, does AudioValve utilize
space in layers. The main PCB is positioned roughly half-way up, and it contains
all of the tubes, the regulation, the capacitors - pretty much everything
bar the power supply. That's positioned below, the massive transformers shielded
from the circuitry above. And there's ventilation everywhere, so the Challenger,
though running hot, seems to cooler than l'd expect of an amplifier bearing
a half-dozen 6550s. |
With the Krell KPS25sc still around (l'm in no rush
for it to be collected), 1 used that as my primary source. l did, though,
run the gamut with speakers, the selection including Spendor LS3I5As, which
need hardly any power to reach their limits, Wilson WATT Puppy 6, Quad ESLs
(57 and 63) and a quick burst through the Apogee Scintillas of the 1 ohm
variety.
ULTIMATEAUDIO
Not being a savage, 1 tried the Apogees just to see
if the AudioValve amplifier would drive them; previously, the only tube amps
1 used with my Apogees which didn't burst into flames or merely expire were
the late, lamented Beard P1OO monoblocks. The Challenger certainly provided
enough juice to allow the Scintillas to work adequately in my 12x18ft room,
at my preferred and admittedly soft levels, but this was just for a laugh.
But 1 thought you should know, in case you're a sadist. 1 don't really recommend
it - for 1 ohm loads, 1 stick with Krell and the like - but it 5 an interesting
litmus test with possibly costly results. ULTIMATEAUDIO
Back with the Wilsons, it just was not what 1 expected.
Previous experience with Teutonic tube amps - I'd just reviewed an Octave
pre-amp for a British magazine, and have also used Klimo, Kebschull, and
others - led me to conclude that German designers want their tube amps to
behave with the etiquette associated with transistors: cool, dean, tight,
analytical, with just a hint of tube-ness. Clearly, Herr Becker prefers warmth,
a sound more zaftig than the others, more Brunhilde than Claudia
Schiffer. ULTIMATEAUDIO
At no point was power ever an issue; according to
AudioValve, the 6550 and KT88 endow the Challenger with 140W output, whereas
the EL34 or KT77 deliver performance at the lower power limit. (Looking at
the various tube tables l have to hand, this also suggests that AudioValve
isn't running the tubes too hard, either, because 23.3W from each 6550/KT88
and 18.3W from each EL34 are well within their capabilities.) Considering
that I'd just been using 300W Krellpower on the Wilsons prior to the AudioValve's
arrival, it says much about the German tube amps that there appeared to be
no sacrifices whatsoever in terms of dynamic qualities.
ULTIMATEAUDIO
Abundant SPLs, exquisitely rapid changes from softest
to loudest, crisp transients regardless of frequency: that's the Germanic
side of it, dealt with as a matter of course rather than as an over-riding
signature. As expected, the AudioValves dealt with large works - yup, the
<Glory> soundtrack - with ease. No compression, no dipping, no running
out of steam. What tempers these seemingly solid-state virtues are the tube
touches, and it's here that we find one of those rare amps (like the big
Audio Research and c-j models) which can convert tranny
heads. ULTIMATEAUDIO
Without compromising any of the traits which make
a tube amp the choice of many, AudioValve has instilled the sort of composure
and control normally attributed to 150W-plus solid-state devices. The slam,
the top-to-bottom control, the sheer mass - all are present. But so, too,
are the deliriously tube-y qualities which keep me forever wedded to my old
Quads and Radfords; in fact, the Challenger with EL34s sounds like a Radford
5TA25 on steroids. There's a spatial spread which both suggests that your
room has suddenly grown deeper and wider, along with a facility for helping
speakers to disappear (assuming that, like most ESLs and most well-designed
point sources, the speakers allow it). Here, the teensy L53/5As proved
most-blessed, because the AudioValve exploited the BBC design's life-like
mid-band and where'd-the-speaker-go? dispersion characteristics in a manner
never dreamed of by the L53/5A design team. |
But 110W into a tiny two-way designed in ,75 isn't
exactly normal usage of a cutting edge tube design, so the serious listening
involved the Wilsons. Most telling of all was the bottom end, which, while
slightly less solid and tight than when derived from the Krell FPB3OOc, displayed
none of the flubbing or looseness which the anti-tube brigade always uses
as a get-out clause. And while you'd make no mistake that you're hearing
something other than a big Krell, the giveaway would <not> be the
extension: the Challenger goes deep. I'd recently been revelling in the new
AI Green package from Edsel in the UK, and Wille Mitchell productions always
boast the sort of fluid bass which can embarrass a lot of systems. Well,
stone me: these Germans have soul.
ULTIMATEAUDIO
To try and separate the Eklipse form the Challenger,
1 swapped them around with the Krell equivalents. If there are any deficiencies
in one being compensated for by the other, 1 couldn't detect them. Both exhibited
the same spatial characteristics, smoothness and detail retrieval. As the
Eklipse proved ghostly quiet, with only the slightest hint of tube noise
when ear 5 placed next to speaker, 1 was able to determine that the Challenger
has a shade more of the low-level whoosh than the pre-amp. But 1 compared
it to two other octal-base amplifiers 1 had handy - both champions in the
quietness stake - and determined that it was the tubes rather than the Challenger
per se. ULTIMATEAUDIO
For the
curious, the other amplifiers used two and four valves per channel, 6550s
and KT88s. While l didn't have enough to re-tube the Challengers, as 1 said
before, it did give me the opportunity to compare AudioValve's Sovtek EL34s
with Gold Lion KT-88s and unbranded 6550s. Power aside, the Russkies were
slightly softer at the extremes and exhibited a trace less punch; conversely,
they were richer in the midband and more vocals-friendly, as demonstrated
by the lush ,,Rivers Of Babylon" on Ronstadt's <Hasten Down The Wind>
and the Judds' take of ,,Don't Be Cruel". Now 1 know that a dozen tubes of
any sort is a serious investment, so I'm not suggesting profligate tube
experimentation. But it sure is nice to know that you can convert the Challenger
for either reasons of either economy or sound. ULTIMATEAUDIO
It was easy to fall in love with the AudioValve pair,
even the baroque styling; it was like looking at a gigantic Montblanc pen.
The Eklipse impressed me because of its authoritative performance, openness,
ergonomics and build quality. The Challengers? Deceptive they are, like U-boats.
Small footprint, not too heavy for a 6-valve amp with huge transformers -
yet they drive any bad without complaint, maintaining their composure at
all times. Yeah, 1 could live with these without
complaint. ULTIMATEAUDIO
Unusually, given its country of origin, the AudioValve
set-up suffers not the traditional German curse of being over-priced; forgive
me, but it seems like a bargain. As one who utterly despises the manoeuvrings
of European Community - the largest scam ever perpetrated on an entire continent
- 1 am pleased to note that all currencies linked to the Euro, including
the once mighty Deutschmark, have been devalued against the dollar. With
the Euro tanking - just writing that gives me a woody! - a pair of Challengers
sells for $7,900, while the Eklipse (with remote) costs only $3,490. These
are the sort of prices you'd expect to pay for top-notch home-grown gear,
let alone European imports, and if you told me to double them, I'd still
think they were worth considering. Grab yours now, before the non-elected,
corrupt scum in Brussels artificially shore up the benighted
currency. ULTIMATEAUDIO
*1 wonder how many Eklipses AudioValve can produce
before they run out of these rare resistors... |
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