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Old 08-06-2008, 05:41 AM
firenzeprima's Avatar
firenzeprima firenzeprima is offline
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Graetz Fähnrich color electronic 2441

Forse il pezzo più interessante della mia collezione, un tv color anno 1974 ibrido cioè valvole e transistor. 20", 7 canali varicap, senza telecomando, assorbimento medio 300W. lo trovai per strada accanto ad un punto di raccolta spazzatura. non funzionava. il guasto era la valvola pl 500 KO. la causa era data da una cattiva riparazione precedente, in pratica avevano by passato due resistenze da 1,5Mohm sulla sezione HV. ripristinato la causa e sostiutito la py 500 il tv color riprese a funzionare meravigliosamente, soltanto che dopo circa un anno si è verificato un'altro difetto. si accende con filamento ok e HV presente e con audio ok, ma nn si vede nulla sullo schermo, come se mancasse il segnale di luminanza. credo che la crominanza ci sia, adesso se ho un po di tempo da dedicargli cercherò di eliminare anche questo guasto,
devo dire che tra tutti i tv color che ho visto, questo ha un immagine e dei colori superbi

Last edited by firenzeprima; 03-10-2009 at 03:23 PM.
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Old 08-06-2008, 11:26 AM
JB5pro JB5pro is offline
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That's a good looking cabinet design

It would be good to have your words in English if you can.
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  #3  
Old 08-06-2008, 11:41 AM
firenzeprima's Avatar
firenzeprima firenzeprima is offline
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Quote:
Originally Posted by JB5pro View Post
It would be good to have your words in English if you can.
sorry!
here the translation.
Perhaps the most interesting piece of my collection, a color TV, year 1974 hybrid that is valves and transistors. 20 ", 7 diode varicap channels without remote control, average power compsuntion 300W. I found him to steet next to a garbage collection point. at first it Did not work. The failure was the valve py 500 KO. The cause was given by a previous bad repair, in practice had spent two by resistance from 1.5 Mohm in section HV. reinstated the cause and the replace pl 500 he resorted and the color TV to work wonderfully, only that after about one year occurred another defect. ignites with filament ok and HV present and with audio ok, but we see nothing Nos on the screen, as if lacking the signal luminance. chrominance believe that there is now if I have a little time to devote to try to eliminate this failure,
I must say that among all the color TV I've seen, this has an image and color superb
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