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Old 23rd May 2016, 8:10 pm   #1
Retro-valve-guy
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Default Grundig Zauberspiegel 439 (1958)

Got this TV a while back, its a GRUNDIG ZAUBERSPIEGEL 439 from Germany What worries me a bit is that some chassis rust which means moisture and humidity is not good for these TVs primarily for HV transformer (LOPT). Capacitors are definitely bad so need replacment.TV looks pretty easy since all of the fifties TVs were, tubes and two resistors and a capacitor.

http://www.radiomuseum.org/r/grundig...iegel_439.html

Now I recently had a bad experience where I powered a set up not knowing it was exposed to humidity a lot and of course the LOPT(HV-winding) melted shortly after that.Now this TV has some surface rust which means damp environment,Now how can I get the moisture out of the LOPT if it has any in it and how to tell if its been damaged by too much humidity ??


The CRT loks good, now there is some wear on the CRT mounting screws, which may indicate a replacement/rebuild tube, which would be a good thing also the gun inside the tube doesn't look discolored but all silver, which is another good sign, also tested the filament and it is intact


Gotta find the time for this one, still got that Korting to fix...
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Old 24th May 2016, 12:28 am   #2
John123
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Default Re: Grundig Zauberspiegel 439 (1958)

I think I remember seeing an American chap on YouTube actually boil an LOPT in a pan of hot wax. When the bubbling finally stopped it was a sign that all the moisture had evaporated out of the coils!
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Old 25th May 2016, 8:33 pm   #3
German Dalek
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Default Re: Grundig Zauberspiegel 439 (1958)

Hi,
Place it in the kitchen oven, NOT the microwave!
Warm it up to 40-50 degrees and keep it there for more than a half hour.
Good luck!

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MARC BOLAN, he was/is the real king of Pop Music!
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