Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

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Original Message

"Hazen Grid Mod"question

Posted by Yoshimitsu on May 1, 2022 at 09:41:32:

HI

So I've found out about this mod in this post here from 2011 https://www.audioasylum.com/messages/tubediy/200313/my-adventures-with-decware-s-quot-hazen-grid-mod-quot-long
It piqued my interest and now I'd like to try it on my single-ended EL84 amp.

According to the post, I just linked, I am supposed to connect pin nr.3 to pin nr.6 with a small foil cap.

But then he also writes: "A few notes: the connection can be made from pin 3 to pin 1 since 1 and 6 are internally connected in this tube."

Now I am kinda confused, am I supposed to connect pin 3 to 6 or pin 1 to 3? Or do both variants work?

Also, I don't quite understand why this mod would work on EL34 tubes, pin 6 on EL34 tubes is NC. On 6P15P pin 6 isn't NC.

Here are some more Infos on this mod for those who would like to know more: https://www.decware.com/newsite/paper146.html

Cheers