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Category Archives: 6CA7-Z / 6CA7-T (EL34)/TII
Feedback from owner who has owned both Treasure and Psvane 6CA7 (EL34) tubes: (original post on Audiokarma.org, member Pen Name)
“Ordered on Tuesday, a quad of these tubes were playing in my Shuguang I-25 on Thursday evening. Thanks for the great service, Rachel!
The Psvanes (not sure if this is an official brand-name typo or a copyright thing – but I think the name really ought to be Pavane) replaced Shuguang black treasure tubes that appeared to be getting a bit worn. When I ordered the tubes I was not certain that the rather modestly priced hardware of the I-25 would justify $360 of grade A glass – but now I am. The Psvanes are significantly better than the Shuguang treasure tubes, even without burn in and now with about 25 hours on them. Of course my memory of how good the treasure tubes were at their best has faded – but I do not remember the treasure tubes to be as incisive as the Psvanes. The Psvanes bring the system to a new level.
The I-25 really is a good little amp, capable of revealing the difference in these power tubes.”
from customer Lyle C. by email:
I bought a quad of the Shuguang Black Treasure 6CA7’s from you recently and love them. They are exceptional tubes, absolutely killing the EH 6CA7 and Tung Sol reissue EL34’s I’ve tried.”
Feedback from customer Gregg O. by email:
“The 6CA7Z’s arrived safe and sound.
I have about 5 hours on them and so far I think something special is going
I have on hand a quad of NOS EL34’s from a very reputable source that have
150 hours on them..and so far the 6CA7 Treasures seem to have more fullness
and body to the sound without sacrificing detail.
I can safely say that if one wants to prevent stomach ulcers and headaches(
from banging your head against the wall) trying various NOS EL34’s…Just
buy the 80% emission Treasures and be done with it.
Posted by forum member:
I would recommend the Shuguang Treasure 6CA7-Zs, as tested and screened by Grant Fidelity, as a substitute for the EL34s. The additional cost is well worth the better Grade A. I noticed that the heat from the Treasure 6CA7-Zs is substantially and significantly less than the heat that emanated from either the Siemens or the JJ KT77s or the EH EL34s. That thermal difference could well mean a longer life-span for the Treasures.
original post here: http://www.audiokarma.org/forums/showthread.php?p=4503443
by email from customer Kevin K.
Thank You! The tubes arrived today and I can best describe them as “emotional.” I have had the CD 327a powered on for two days now and listened to Rickee Lee Jones and The Durutti Column through the Treasure Series this afternoon and they sound very good already. Perhaps the selection of tunes has to do with the “emotional” tag; I dunno…’
Comments from Simon N. in Ontario:
I have a GrantFidelity A-534 with a set of Telsa EL34’s NOS, they’re good to me compared to the stock GF (Shuguang generic clear glass) tubes, and initial thought on the black bottles, they weren’t as open and quite rough sounding compared to the Telsa’s. Burned them in more hours but still not too impress, then I left the amp on over night for good couple of weeks to burn them in. Now they sing!!! Sounds very live with these new tubes and very smooth sounding.
They also look nicer than the Telsa with the black coating on the glass. I’m not sure if I can get better tubes for what I spent on these, but they worth every penny to me!
original post here: http://grantfidelity.com/forum/viewtopic.php?t=291‘
– from customer Richard J.
“Dear Rachel, First I would like to say Thank You for sending the Shuguang Anniversary EL 34 Black bottle tubes. Amazingly they sounded better than the best Mullards I currently have on hand right out of the box. I have never had a tube sound so good with no break in time, and I have been using tubes since 1963. Thease are trurly an amazing accomplishment. ”