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Moses Dmj

Member
Joined
Feb 9, 2023
Messages
12
Location
Sweden
Questions

Does anyone have a good link(s) or book or know

What is changed in a the 12a_7 family of tubes to change the gain etc?

12au7,12at7,12ay7,12ax7......

Is it spacing between grid and cathode and plate?

Is it open area in the grid winding?

I wanted to ask before I break open some tubes

I know pitch lenght shape etc can make all kind of differences

I have not been able to find 12a_7 constuction differences information with search engines and the books I have
 

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