JADIS DEFY7, can not get it to sing

mozartfan OP

The Jadis Defy 7 is not the amp I would recommend with these speakers, as if you look at the impedance and phase angle of your SEAS Thor MTM they are quite difficult to drive at 80-150hz and again at 3khz,
https://ibb.co/Fm8mXwD

Especially when Stereophile said this about the Jadis Defy7 in their bench test of it:

If we adopt a more stringent 1% distortion limit for maximum output, the Defy-7 reached only 12dBW, 16W.

The picture was worse still at the frequency extremes—for example, the maximum power at 20Hz for 1% THD is 9.1dBW, less than 10W, though if some sort of visual clipping limit is adopted, 17dBW, 50W was possible. The situation was no better at 20kHz, where 10dBW, 10W was the continuous power limit for 1% distortion.

These results were repeated into a 4 ohm load (remember that this is ostensibly the 4 (to 8) ohm tapping on the output transformer). With both channels driven, the result was a loss in level of between 3 and 6dB, depending on the distortion criteria.

Cheers George

Hi George, Way over my head level of understanding. Good news is I just got back fromm my tech guy in Baton Rouge . The slight hum I heard out the right channel was mainly from the pre,,,,BUT/HOWEVER there is a  MINISCLUE hum, in the jadis right,,,as i say only the vol on the powerless vol control is turned up to lowest muisc level, no one on earth can hear the hum = the amp is in PERFECT 10/10 condition. 
The LITE LS9 chinese tube pre (modled on the jadis JA200 pre,,or so they say,,has like 10 tubes) does have a  hum,,BUT/HOWVER after 3 minutes warm up (which i did not allow for at my house,,I shut it off after 1 minute) the hum (lacking some proper grounding,,,= possible the brand new cheap $5 interconnects) the hum fromn the pre completely disapears)

I am  His shop has a  old 3 way witha  a  15 inch woofer, 
The amp WORKD, 10/10,,I am hestitant to sell it now that i acutally heard this amp in performance,,and can not wait til my spade wire end post arrives fromk ebay so i can take the bi wire from each speaker, join them  witha  wire nut,,then takea  single wire, hook up the spade end post to the wire and now makea   single wire instead of bi,,as it is wayyyy toooo dif to twist 2 thick wires together and wrap it around the Defy's speaker post...
So I havea  ALOT going on,,but the GREQAT news is the amp  has a perfect (slightest hum) bill of health,,and now i am about to makea  offer on a  big tube pre amp off ebay.
I will test it out,,and seller mentions i can return if not a  match..I will give him $200 restock fee for kindness.
So the big Q is, are the old 3 ways with the 15 inch woofer a  better match, = more efficient vs my King of all speakser, the SEAS Thor's with the exteeme demand  = low efficiency???
maybe the speaker spades are in my mail box now,,,be right back,,,,,,no,,maybe tomorrow,,,I will only test the speakers when i get the copper speaker spade,,,I can not wait!!!!
Guess I may sell my brand new CAYIN EL34 25 lb amp, just arrived, has a weird 220 plug,,,seller is sending a  adaptor for my stepdown trans,,,,

If the Cayin 25 lb intergrated sounds OK = some bass, great mids, sweet highs,,I will keep the cain and sell the Jadis,,,all is ????, = open possibilites at this moment. 
But as i say, the jadis is really LIKE NEW as the Audiogon seller back in 2007 never used the Defy and i have not either,,so its reallya  10/10 brand new Queen of all Amps, The Jadis single mono block.
I wil also mod my Thors,,,taking out the bottom W18 6/5 woofer and replacing witha  a EXCEL (The King of all speakers =the SEAS EXCEL)W22, 8 inch woofer for a  added few HZ's on the bottom,,and maybe addinga  Mundorf Silver Oil cap , just 1, to the tweeter.
Lots of plans,,  all is ???? at this point.
I was very concerned when i 1st heard the hum after arriving home last week,,,which is why i drove back up today to listen at the tech's table. 
He agrees the amp is 10/10 ,,,now of course to you perfectionist audiophile troops,,its not OK, as the hum, ever ever so sligyht, should not be there. 
I say, who really cares abouta  hum so slight,,that when the muisc kicks in at vol level 1, the hum is IMPOSSIBLE to note.
I am nota  perfectionist audiophile,,i am only interested in life like sound stage. 
The thors deliver this image perfectly. 
Bass = check
mids gorgeous,
highs super clear , distortion free , with the King  of all tweets, The Royal Millenium 

well i figured why not try to get the amp, pre , cd player up on a  bench , instead of trying to bend over breaking my back, poor eye sight,,all discombobulated,,,so i did just that,,set the Jadis Defy 7 up on a  bench with Lite tube pre Cayin CD player with high end op amps installed,,all i have to do is sway out the chinese 6922 for the Bugle Boys 6922 and hooked the speakers correctly BIWIRED,,,
Found 1 jam cd, (as all my cds are classical) , found a  Tina Marie best hits,,BAMMMM! 
Like majic, 
This Jadis Defy 7 sitting on my shelf now since 2007, is now finally SINGING gorgeous.
UNREAL, Class A sound.
Now all I have to do is upgrade at least 1 cap in my Tghors to the Mundorf silver or Mundorf Supreme and add in a  W22 8 inch 
UNREAL. 
I will now order that cayin Pre amp
Thanks
For all the great tips to help me out..
I will keep posting as changes aere made,,,Tina sounds INCREDIBLE on this Jadis Defy with EH KT90's. Bugle Boys in the 4AX7 and Bugles in the 2 AU7's. 
Tina's voice sounds just LIVE. 
Finally i  can give up my $20 computer speakers listening to past 10 yrs,,,
WOW. 

HOLD ON, SELL is off.
Yep, 
Just purchased the XIANG 728 tube pre, arriving next week, if a  no go, will return and buy a  
LEAF  Audio tube preamp.
Will report back on all the new listening seesions. 
Both pres have dual outs, So I just bought a  10 inch sub cabinet, + a  dyanco 70 watt RMS sub amp + a  excellent Cerwin Vega 10 inch woofer.
will let you guys know how the XIANG SHENG 728 responds. 
My hunch is RETURN and buy the Leaf Audio pre.
paul
new orleans

I am a bit bewildered by all your fast moves but one thing that is driving me crazy. You have a superb amp and finally have heard it sing. And yet you continue to throw a series of cheap nondescript preamps in front of it hoping for good sound. Instead of buying a bunch of different things, subwoofer, sub amp, new speakers, why not invest in a really good preamp?