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Category Archives: 12at7/ECC81
Amperex 12at7 Foil Getter
Sylvania JHS 12at7WA Black Plates 3 Mica
Tung-Sol 6201/12at7wa Black Plates
“12AT7 Tungsol sound superb, especially the 1950’s black plate; very clear, great upper midrange presence, extended highs, wide soundstage”
The three Mullards – 12ax7
Recently I got curious about a sound of tubes produced based on the same technology and in some cases the same equipment, but in different places. One of the reviews was dedicated to EI 12ax7 produced on Telefunken’s equipment and the results were not equal at all.
This time I looked at Mullard’s 12ax7 production from UK, India & Canada. Now the process was supposed to be controlled by Mullard and technology should nave been used the same, so the results should be very similar – they are not.
Sylvania JHS 12at7 Gray Plates 2 mica
Amperex 12at7 Bugle Boy France
“superb lively sounding 12AT7, Bugle Boys have a magical sounding upper midrange”
“Those French made 12AT7 Amperexes are supposed to be some of the best sounding AT7s made” Read
Sylvania JHS 12at7 Gray Plates 3 mica
On 12at7 – Differences & Similarities
I recently went through testing of a lot of different 12at7. Here is what I found out.
If the tube is used in the circuit it’s designed for, there is very little sonic difference between various tubes in this family. The difference is possibly 1%. I tried NOS Telefunken and ShuGuang with practically the same results. I also tried them in multiple amps with the same results.
ShuGuang 12at7
Again no reviews on internet. It’s hard to find reviews for the new tubes 🙁