[Boatanchors] Siezed bakelite

[mikea]

On Wed, Jul 19, 2006 at 02:07:52PM -0500, Revcom Electronics wrote:
> Boatanchorites....
> 
> Surely someone has done this before so thought I would ask.
> These don't have tubes, but used with tube sets.
> 
> I have a set of "antique"? Goldak headphones, Type 45, 
> where one earpiece has the cup ring frozen on due to rust
> I suppose.  Other side is OK, need to open it up to see if
> can repair coil and clean diaphragm.
> 
> Tried penetrating oil, no luck, any suggestions to loosen 
> it up other than bust it to smithereens?

Try sticking it in the freezer if you think that the metal has a
bigger thermal coefficient of expansion than the bakelite, or in a
150-degree oven if you think the metal will expand less than the
bakelite. Shrinking the metal (or expanding the bakelite) will give
more room for the threads to loosen and move, and may help you.

A report on how you actually get it to work loose will be of use to
many of us. 

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin