Genelex Gold Lion KT-88 reissued tubes

I am currently using both the Tungsol 6550's (in an Audio research Ca50) and the Gold Lion KT88 re-issues (in a Cayin A70t) These tubes are quite different sounding. The Tungsols being smoother with a rich midrange and have been ideal for warming up the (to my ears) thin sound of the ARC products. The Gold lion's have incredible extension on both the top and bottom and have a very clean but not dry midrange. Probably the best way for me to describe it is that the difference in sound between the triode and pentode modes of my Cayin A70t (which with the Cayin supplied KT88's was Dramatic) has been reduced to barely noticeable. This is far and away the best KT88 I have heard. FYI, I also currently own Sovetk KT88's,SED 6550's,Original Svetlana 6550's, GE 6550's and Valve Art KT88's for comparison. Hope this helps.

Geraldm121, Did you by chance try the 6550's in the Cayin and the GL's in the ARC? I'm using SED KT88's in the Cayin and I'm curious. I tried some SED 6550's and found them a bit dry in that unit (they remain my 6550's of choice in other amps).

KT88's in general don't seem to do well in the ARC. I have not tried the Gold Lions but I did try the KT88 Cayin/Shuguangs that came with the Cayin. They were very hard sounding (almost like bad solid state)and they came out immediately.
The Tungsol 6550's were quite good in the Cayin but not quite as detailed in the high end with a softer sound in general and a very lush bass. That said, I could live with that combination but I probably would change the 12ax7's from the the current Mullard re-issues to a crisper sounding tube like a Telefunken (which were too bright when used with the Gold Lions)or RFT. Currently the 12au7's in the Cayin are Telefunkens that I had saved for 20+years!

Well, let me provide a little different perspective. I've tried the KT-88 Gold Lion re-issues, and and sad to report their reliablity is very suspect.

I've had four different tubes go out, all withn 100 hours of use. They either experience bias runaway (get cheery red), or they perform a very intensive blue light show, which will promptly take out the associated bias resistor.

All in all, while they do sound good, what good is that if they dont last, and take out your parts? I checked with a well respected audio shop in New York, and they more or less told me the same thing.

So, with that in mind, whats one to do? My stash of GE 6550A won't last forever, so I'm looking for a good sounding RELIABLE 6550/KT88 type that sounds as good as the GE tube. I have one set of 6550C from late 95, and while they are okay, they are not in the same class as the GE. Any suggestions?

SED(Wing C)6550's. Rugged, dependable, excellent quality. I've had one bummer in the past 10 years and it was too hot to bias in properly so it never got used. I bought it about 7 years ago but didn't use if 'til about 3 years ago. No other problems before or after. No shorts or premature deaths. Excellent bass, linear thru the mid range and if anything a bit, but not much, soft in the highs (something that helps sometimes with some bright sources).

BTW, re the KT88's, are you by any chance the same fella that Jim McShane is talking about in AudioAsylum who lost 4GL's?