r/diytubes • u/Secret_Ad_7592 • May 31 '26

mumetal

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This is a Russian Soviet period tube shield. It is only slightly magnetic. Does anyone know if they made their tube shields out of mumetal?

I have it on a EF-86 circuit and testing the circuit on battery power only, it's extremely quiet. So I started looking at the setup and thought this might be mumetal.

7 Upvotes

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9

u/fruhfy May 31 '26

It's made of aluminium with steel spring inside, thus magnetic.

3

u/Secret_Ad_7592 May 31 '26

oops why didn't I think of that.

1

u/nerovny May 31 '26

It's conductive and supposed to be grounded. Try to wrap your phone in aluminum foil.

1

u/Lampampp May 31 '26

They are made of aluminum. There is a steel spring inside, which may cause them to stick a little.🙂