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In Reply to: RE: More bias troubles with Treasure Black bottle tubes.....I give up posted by Mendel on September 24, 2016 at 19:35:53
Mendel,
That is odd. I'm using the KT66z in a single ended & triode wired amp and have had no issues. BTW, what did Racheal have to say?
Follow Ups:
The KT66z were from PartConnexion. They have readily agreed to take them back, no problem. They always stand behind their tubes.
I got the KT120z through Racheal in Calgary. The first quad had a tube that wouldn't bias, so I had to send the whole quad back. The second quad ran great for 2 weeks then wouldn't hold stable bias. I am sure Racheal would have taken them back, but by this time I was fed up and didn't want to spend the time and dollars to ship them back so I just ate the loss.
Now I understand this grade A and grade B stuff with Treasure tubes. A lot of bad shit coming out of that factory with minimal testing.
If you get a good set they are great. They always sound good when they work, the question is if they work and for how long. I have a quad of the Treasure 6CA7 (which I bought used on Canuck Audio for $150 Canadian) and they have several hundred hours on them, they have never given me any problems and sound great (for EL34). But given that the Treasures go for roughly $100 a tube the risk and aggravation is not worth it to me anymore. I can find EI KT90, GE 6550, strong used GEC KT66 and GE 6L6gc, Mullard EL34 and others for that kind of price. Never had a problem with a vintage output tube in the Rogue.
Also never had any problem with the Penta Labs KT88 or the Psvane KT88. Only the Treasures, and only the Treasures seem to have different grades. Kinda makes you wonder.
I read that duds are smuggled out of the factory and sold. Bummer. I bought a barely used quad of the KT66z for $185 and liked them enough to get another quad. My amp is single ended triode wired and self biasing. I have no idea how hard they are driven. The GL KT66 is a fine tube too. I just like the Treasure's a bit more.
Edits: 09/28/16
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