Tag Archives: 6CA7-Z

6CA7- ‘they are exceptional tubes’

from customer Lyle C. by email:

“Greetings,
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.”

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‘Just buy the 80% emission Treasures and be done with it.’

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
on.
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.

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‘Not sure if I can get better tubes than what I spent on these’

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!

Simon

original post here: http://grantfidelity.com/forum/viewtopic.php?t=291

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‘they sound better than the best Mullards I have’

– 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. ”

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