tubes for leben cs600


hi there.
i look for good tubes for my leben cs600 that connected to my devoe nines speakers .
i dont know alot on tubes i have now kt77 and kind of el34 tubes but they are in the end of them life. igot suggest to buy from jim mcshane and he give me this suggsted :

(1 quad) 6L6GC-STR Tung-Sol reissue, $87.50
(4) 6CS7 - 2 Sylvania & 2 Raytheon/Japan, $38.00/set
(1) 6CJ3 GE NOS USA made, $7.50
but when i try to invite he email me and say that only 2 6cs7 sylvania he can provide because he dont have in is stock 2 more c6s7. so i dont know what to do i most have new stock of all the tubes to my leben ,i wonder to buy from the company leben extacly what they put inside the leben but to order it is about 400$ to israel all the
tubes new, or to buy from jim mcshane the tubes that he have for 120$ besides the 2 6cs7 that he dont have in stock and he dont know if he will have it ,so maybe to buy the two that he miss from ebay bout i dont know what to buy from ebay very confused
please any suggestion about th tubes what you says my friends
thanks alot
bolero32
Get the tubes from Jim. The 6L6GC-STR Tung-Sol Quad is a good choice IMO.

I have KT-120's (matched quad) in mine that I bought from Jim and they sound great.

The rectifier tube (6CJ3 ) doesn't enhance the sound if at all when rolling In a non-stock one.
when i bought my leben i get it with GoldLion kt77 genalex russia .now it in the end i search on ebay about this kt77 and its much more expensive then the Tung-Sol 6l6gc, i like to know why and if the price is the diffrent or the quality is better in the kt77 goldlion or maybe is better to buy Tung-Sol 6l6gc ??
i order 2 6CS7 - Sylvania from Jim (because he have only 2 in his stock), and 2 others 6cs7 from ebay Sylvania USA Black Plates NOS Double Triode Leben Re-Branded for Westinghouse Canada .
is it all the 4 tubes 6cs7 will work togther very good or because they are 2 tubes from Jim and 2 from ebay but they same tubes sylvania 6cs7 and just diffrent companies and the 2 tubes from ebay NOS Double Triode Leben Re-Branded for Westinghouse Canada is this different (i really dont know what that means double triode ) will effect the sound or will make the sound not shine or it will be very good ??
please tell me
im really not understand alot in tubes only few things basic things
thanks alot and sorry about my english
Bolero - I can't say for certain why one tube costs more than another except for the usual: supply and demand. IMO it has more to do with performance in the targeted amp. In this hobby subjectivity is king. The beauty of this amp is the flexibility an owner has in trying out 'many' different tubes! Each tube characterized by its own signature sound.

Check with Leben (muson@leto.eonet.ne.jp) about mixing different brand tubes within the CS-600. Since this amp is auto-biasing you may be alright. I always put in a matched quad just to be safe and have never 'mixed' different brand tubes in the CS-600 WRT the power tubes. Most probably would not.

See the linked sheet for possible power tube combinations sent to me from Yoshi Hontani (Managing Director):
CS-600 TUBE COMPATIBILITY LIST

Sounds likes you've only had the KT77's in the CS-600? What other's - if any - have you tried and/or compared them to in the amp?

If you haven't started your "rolling" (tubes) adventure then buckle up and get ready for the ride of your life.

enjoy the music...
EL34 and 6l6GCs have pretty different sound signatures so it will be different as EL34 have a lot more warmer lusher sound (Generalising) and 6L6GCs much more bolder and wider across the range (Again Generalising)
for the price the Russian 6l6GC reflector equivalents (6n3c e) are great..they are not expensive and definitely better than the SED6l6GC i used in the past.

But for me..as has been mentioned by Notec, the KT120s are in a different league altogether . the 6cS7s, at least to me do have an impact but its minuscule in comparison and in my opinion, need be on ones agenda only after changing the power tubes.