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Shuguang Treasure tubes....

I'm not sure if this is in the right place but this is about the tubes in my amp so here goes....Has anyone else given these Shuguan Treasure tubes a try?

I recently bought a used tube amp(VAC Phi 110) and the tubes that came with it were shot so I started poking around for some new tubes. I was looking for some Shuguang tubes, which are what I believe VAC supplies as standard/stock, and ran across Shuguangs limited production Treasure tubes. I poked around and did some reading, found a review or two and decided to give the only distributer for N. America(Grant Fidelity) a call. I spoke to a very kind and helpful lady who was patient with me(quite the task I might add!), was very nice and helpful and was darn knowledgeable on the tubes. Before I knew it my wallet had leapt out of my back pocket and I had splurged and ordered a matched quad of the Treasure Tubes, KT-88s. Within a couple of hours I had a tracking number and about a week later a box labeled "FRAGILE: GLASS!" was waiting for me when I got home from work.(A quick side note; during the short wait for the Treasure tubes to arrive I was using a borrowed quad of stock VAC KT-88 tubes and they were wonderful, great sounding tubes that I could live with forever....or that is until I found the Treasure tubes anyway.)

When the Treasure tubes showed up I ripped into the box and was shocked to see that each pair comes in a really nice presentation box with each tube very well protected in a foam insert, very classy. I removed the tubes, admired their beauty(they really are sweet looking tubes!) and popped them in the VAC and let them warm up for about 15-20 minutes. I then set bias on them and hit the play button expecting the usual tube break in time-wrong!...right out of the box these tubes sound fantastic! Seriously, I am shocked how at just good they sound fresh out of the box. Smooth clean highs, strong deep bass and all the other audiophile words we so endear. If they're this good right out of the box I can't wait until I get 100 hours or so on them. I'm no reviewer but I can say that these tubes offered a noticable improvement in my system and are worth every penny of their asking price, no doubt about it! So far they are chugging along and sounding beautiful and hold a rock solid bias, ZERO fluctuation.

Please understand that I have no affiliation with Grant Fidelity but when I run across a company that treats their customers so well and offers a product that performs at this level I feel I should share my experience with others, I'm one VERY hapy audionut!

Yes I actually do have a question and here it is; They(Grant Fidelity/Shuguang) also offer a 6SN7 substitute called the "CV-181", this is supposed to be a direct replacement for standard 6SN7's and I'm very interested in those as well. Has anyone else had the opportunity to give these tubes a try? Thanks for your replies.

Sincerely,
John
128x128johngp
johngp's avatar
johngp OP
226 posts
 
Hi Ian,
I spoke to you on the phone about the tubes a few weeks ago, thank you for all your help. I really would love to give the TT CV-181's a try but I just read that review you posted and I have a question; in his review the gentleman states;

"This is why the CV181Z might not be a drop in replacement for the 6SN7. Typical 6SN7 heaters draw about 0.6A and the CV181z draws about 0.9A (900mA), the old Mullard CV181 drew 950mA. This 50% increase in heater current amounts to 0.6A for a pair of CV181 in a circuit, which as you can see represents the load of a whole extra double triode."

I printed out the specs for a standard RCA 6SN7 GTA and for the TT CV-181 and the specs on the TT CV-181 specify a draw of .6 MA not the .9 MA draw the reviewer states. Is he mistaken? I would worry if the 181 did draw .9 MA as my Vac needs a quad of them and that would add up to possibly to much current draw then wouldn't it?

Thank you for your time!

Best,
John
grantfidelity's avatar
grantfidelity
21 posts
 
Hi John, this is Rachel here from Grant Fidelity.

I spoke with both Shuguang and the TNT-Audio.com reviewer about the CV181-Z specs and compatability with other CV181 tubes. TNT-Audio.com's comments were based on reviewer's assumption that the Treasure CV181-Z was of the same spec as other CV181's. The reviewer is in the process to put a note to the original review to clarify the issue. (It's summer vacation time now so the website isn't updated weekly until later next month). The reviewer's comments about CV181 tubes vs. 6SN7 tube are valid to all conventional CV181's, but not to the Shuguang Treasure CV181-Z.

If you still have doubts or concerns before using the Treasure CV181-Z in your amps, do forward a copy of the specs (published on our website) to your amp manufacturer to get a final confirmation.

Thank you.
Rachel @ Grant Fidelity
arthursmuck
451 posts
 
John, can you ask about compatability for the CV-181Z and the Phi 300.1 when you ask about your 110? Thanks!
sherod
1,690 posts
 
John,
Welcome to the VAC family. You're going to really enjoy this Beta 110. I'm glad you are trying out these new Shuguang Treasure Series KT88-Z tubes. Supposedly they take 300 hours to fully break in. Ouch! Keep us posted on their progress. If you end up keeping these with a "thumb's up" then I'm going to buy a quad for my VAC monoblocs.
guitarplayer
47 posts
 
John,

They will go through stages of sounding odd from time to time. IIRC--I found them great out of the box up until 50 hours, to be bright and spitty, with sloppy bass for maybe 100 hours after that, then they will really start to come around. After 300-400 hours, everything really snaps into focus and the bass really tightens up and becomes quick, tuneful and really quite good.

Peace,

Lee
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