|
|
Post by kcatthedog on Jan 6, 2024 13:25:29 GMT -6
Hey, I opened up my stam 67 mkii to gently push some headbasket wire mesh back into plane: don’t ask, nothing major !  The Mike is a couple of year’s old, light use. I was surprised by the discolouration on the brass parts of capsule. Just normal aging as the brass is exposed to air? thx !   |
|
|
|
Post by Blackdawg on Jan 7, 2024 1:44:14 GMT -6
If it's raw brass then yeah that's normal. well normal for Brass to do that. Idk if its normal for his capsule to do that.
|
|
|
|
Post by kcatthedog on Jan 7, 2024 3:15:54 GMT -6
That’s what I’m thinking too, but wonder what Tim thinks too: thx!
How’s the build ?
|
|
|
|
Post by doubledog on Jan 8, 2024 11:33:35 GMT -6
do you store your mics with a desiccant (silica gel) pack? you also have to replace them periodically (or bake them), especially if they are not in a sealed container. Mics pick up a lot of humidity as people exhale, cough, spit on them all day. you can get the desiccant packs on Amazon pretty cheap.
|
|
|
|
Post by audiospecific on Jan 8, 2024 17:24:09 GMT -6
Hey, I opened up my stam 67 mkii to gently push some headbasket wire mesh back into plane: don’t ask, nothing major ! The Mike is a couple of year’s old, light use. I was surprised by the discolouration on the brass parts of capsule. Just normal aging as the brass is exposed to air? thx ! View AttachmentView Attachment
That is a type of galvanic corrosion from the brass oxidizing from the moisture in the air, that the copper is oxidized off, leaving more zinc dioxides behind. you could probably have someone polish that off, but I would also go further and do a light coat of clear model paint on that surface and it wouldn't corrode anymore.
|
|
|
|
Post by kcatthedog on Jan 8, 2024 17:34:44 GMT -6
do you store your mics with a desiccant (silica gel) pack? you also have to replace them periodically (or bake them), especially if they are not in a sealed container. Mics pick up a lot of humidity as people exhale, cough, spit on them all day. you can get the desiccant packs on Amazon pretty cheap. No, I keep them out and set up. i really just record me so not a lot of use: that’s why the discolouration surprised me, mikes like 2 year’s old. |
|
|
|
Post by kcatthedog on Jan 8, 2024 17:36:57 GMT -6
Hey, I opened up my stam 67 mkii to gently push some headbasket wire mesh back into plane: don’t ask, nothing major ! The Mike is a couple of year’s old, light use. I was surprised by the discolouration on the brass parts of capsule. Just normal aging as the brass is exposed to air? thx ! View AttachmentView Attachment
That is a type of galvanic corrosion from the brass oxidizing from the moisture in the air, that the copper is oxidized off, leaving more zinc dioxides behind. you could probably have someone polish that off, but I would also go further and do a light coat of clear model paint on that surface and it wouldn't corrode anymore.
. I have built an mk-u47 and c12, so have a light touch. So, the trick would be completely protecting the capsule, and being very careful: right ? |
|
|
|
Post by audiospecific on Jan 8, 2024 17:45:13 GMT -6
That is a type of galvanic corrosion from the brass oxidizing from the moisture in the air, that the copper is oxidized off, leaving more zinc dioxides behind. you could probably have someone polish that off, but I would also go further and do a light coat of clear model paint on that surface and it wouldn't corrode anymore.
. I have built an mk-u47 and c12, so have a light touch. So, the trick would be completely protecting the capsule, and being very careful: right ? usually see it where temperature changes from cold to heat and condensation, but raw brass has a tendency to do that. Sometimes its this with losing copper, and grey pits form. The pink is a different type of galvanic corrosion due to losing zinc in its metal |
|
