JADIS DEFY7, can not get it to sing

@ Andrew
Yes the EI KT90's i suspect are not as stable/long lasting/as the new EHKT90's, but ,,oh what a  musical tube, GORGEOUS,,but sadly the usage is  only 1500 hours and then they short out.
The tech guy here in New Orleans said about my Defy 7 , as i wanted to have it cked out before i pulled her in after sitting some nearly a  deacde,,,*Oh the Defy has power trans issues,,blah blah blahhh,,I reserached it online and found several tech blogs stateing the Defy had trans issues,,blahblahb lahhhhh(,,In desperation i cked Baton Rouge and google had ADVANCED VIDEO with many 5 star comments,,I drove up, and 2 weeks later said *good to go*,,*All I did was put the bias right to the KT90s;s,,and also your tech guy in NO had AU's in the AX and AX in the AU front end*,,,!!!???%%$%&**&..Got home hooked it up to my Lite LS9 jadis clone/Cayin CD17 and herad a  hum at opening powerup,,,now i figured maybe the New Orleans tech guy was correct,,,,put the Lite , Defy /cayin CD 17 in my Jeep, drove up 100 miles to BR, and had to hear live session, so he had no other pre to hear,,and we both heard a  *MINESCULE/TINY hum* at powerup,,,,,,he said has to do with grounding, not to worry....got back home, order the Xiang at $300, had 2 types of reviews,,Great vs cheap chinese junk,,it is indeed cheap chinese junk,,but the hum disappeared at startup,,so i knew its not the jadis, it was the Lite LS9,,,The Defy is dead quiet.
I have the LEAF Class A pre arriving later this week, I have my eye set on the cayin SC6LS MARK 2.

Cayin makes incredible well built amps/stereo,,Maybe my Thor SEAS speakers were just too much for the lil amp.
Has a 4 ohm speaker post,,but still the Thors are a  very very demanding speaker.
The Defy is the job for the Thor's. 
My hunch is , the Cayin GORGEOUS 845 has incredible mids,,but will lack that crystal highs which i need.
The EHKT90's, may not offer the same musicality as the now very rare, priced wayy too high EI KT90's, are my best bet for the Thors demands. 

However, i see i am transforming intoa  stereo junkie, and may later on order the 845 cayin. , asa  *2nd System*. 
I have a  400 classical cd collection of say 25 composers and all deserve a  Two Level Listening Experience.
Amperex is the most muiscal of all front end tubes, . The Bugle Boys sing like no others. 
The higher glow does not bother the least.
Now i have to drive up to BR tomorrow  and dump off 2 units,,The Lite LS9, which after repairs, can't fetch much = will take a  hit on that,,and the cayin MT35 will also cost me $$$$. The chinese seller wants my tech to respond to his tech guy, to find out what exactly went wrong, as he  knows Cayin are built like jadis, Tank quality. 
The hobby is bankrupting my $900/mo SS ck.

OK, Here is what i am thinking. If the LEAF delivers muddy/murky/muffled mids/lacks crystaline highs (I am not worried about bass,  as I will employ a  subwoofer), so if the Leaf has no improvements over the 1) Lite LS9
2) Xiang 728,,Then I might have to suspect the issues are with the,,,EH KT90's. 
Yet if I note a  clearer/cleaner mids, some crystal sweet highs/sound stage/dynamics, HIFI Fidelity,,then i know it is not the EH, in fact it was the 2 other pres which were limiting the Defy,,and if this 2nd senario plays out, this will open the door to sell off the Leaf and bring in the Cayin SC9LS,,and will roll the caps to Mundorf Silver Oil. and roll the 6922's to Amperex.
The Leaf should be here by saturday. 
I hooked up the jadis/Lite , to make sure the cd player/speakers had no shorts,,In fact it was the new Cayin which has issues.
Sadly i may have to cover the repair,,but will ask the ebay seller to split the cost.
I try to be fair and equitable , as this is the proper modus operandi, honorable ethos. 
I need someone to give me imput in a  possible combo cayin 845 with the SEAS THORS at 4 ohms, very high demand. 
Is the 845 power output like a  300B amp?
Needs high senitive speakers for ideal performance. ??anyone?

The thought occured to me. 
*Cheap chinese tube pre amps*,,But then lets consider britsih amps,,,no better not, I can't stand anything from england. 
But lets consider *Made in the USA*. 
AKA the 2 kings, ARC and Macintosh.
If I listen to eithers preamps, and find <<COLORATION>, then my judgement would be
*expensive cheap USA pre amps*. Not sure, as i can only recall hearing 1 ARC pre amp. 
which i found colored and *balmy*, *greyish*. 
So whats better low price coloration or high priced coloration?
I'd go low, as the chinese pre at low price alloows to swap tubes AND swap caps to Mundorf GOLD SILVER OIL,,which are $$$$$$$$$, still under the price ofa  mac and ARC.
I'll take chhinese over USA.
Just some radom thoughts. 
The hum in the pre amp is so MINISCULE,,not sure if my tech guy will repair it,,but its there and i can't sell it with that tinest of hum at open 100% vool. 
If you want to buy it, contact me and i will  have my BR tech guy ship it UPS from his shop, where it will sit on his shelf FOR SALE, cheap.

This might be a little off topic but if heat becomes an issue, you can try positioning an electric leaf blower in one corner of the room to move air.