old US Telephone hybrid ('Network' block)

Tony Duell ard at p850ug1.demon.co.uk
Wed Mar 30 13:06:23 CDT 2011


> 
> 
>     I bet the temperature that softens the " insulating media"  is 

Maybe, but the termainl board certainly seems to melt very easily.

> waaaaaaaaaaay lover than the temperature that melts the terminal block. You 
> can use a SMD hot air station to blow air on the box and let the goop go

Oh, I managed to extract the intenrals from the box, But the box still 
contained quite a bit of gunge (not a problem,  I could scrape that out, 
and I can also heat the box, being a metal can, to quite a high 
temperature without problems) and of course there's similar potting 
compound on the intenrals. I don't want to get those too hot for risk of 
damaging them.

I can indentify the expected ocmponents in there -- (2 varistors that look 
like disks with metal coating on the surfaces), the anti-sidetone 
transformer ('induction coil'. call it what you like :-)), some 
normal-looking resisotrrs, and a stack of 2 capacitors in a clip holder 
thing. But with the gunge all overe them it's not easy to work on.

-tony



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