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The Rubys used by Cary were some great sounding valves.. They were Shuguangs (I'm pretty sure). They were better than GL. BUT the GL now, don't suffer the failure rate like they use to either.. For a few years everyone had quality issues.. Factories were being sold everywhere and new factories were being built..
Tube equipment came back with a fury.. It's everywhere CHEAP too..
NOW Valve plants, are in actual competition again (less the covid crap),
for price, quality and market share. Like it should be..
I swapped Shuguang Black Treasures into my Ayon Spirit 2 , enjoyed the sound but 2 failed and I went back to Gold Lions rather than trying the Treasures again. I subsequently tried Psvane T2s , again liked the sound but one failed 3 months in. I could have purchased another Psvane but went back with Gold Lions. Although I know that any tube can/will fail I didn’t want to run the risk with the Treasures or the T2s but that’s me; only you can decide what’s best for you.
Thanks . This is the kind of reports I have seen spread across the internet BB's. Great tubes with little reliability. In my case it was an expensive catastrophic tube failure from the Shuguang. I'm told that the Psvane T2 is a great tube. But your experience shows the same problem with it as the Shuguangs. It appears that in most cases, they fail at about the same time they are just getting broken in. This was my case. Though the amp was used, I could tell the amp had not really been broke in before I got it. (The owner said it had low hours on it). Tough the Gold Lion's sound good, I would still love to hear a set of tubes that was not as rolled off in the high end, like the 2 previously mentioned. But I am not yet comfortable with trying either of those yet, thus my question here.
Just a NOTE:
Whatever you do, do not do any tube business with "CHINA-HI-FI" I ordered a matched quad of KT88Z's a few months ago. When tested, I found that all four were defective. It has taken months to get this resolved. Now YOUN LEE claims to have issued a refund, but did not state through who. I checked all of my credit cards and PAYPAL. No record of any refund credit issued. This is either just a scam or a "delay and evade" tactic BEWARE of this company