The three Mullards – 12ax7

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.

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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.

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