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 Post subject: Italian Toti Radio Schematic help - Electrolytic orientation
PostPosted: Jun Wed 09, 2021 6:03 pm 
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Joined: Jan Thu 06, 2011 6:32 pm
Posts: 408
Location: Bethpage, NY
See attached schematic. I have a loud hum in the speaker, obviously due to bad filter caps (both 8uf). I replaced them with 10uf caps but the hum persists. I am unsure I got the caps polarized correctly as the schematic does not show which is positive and negative. I assumed the first one that attached to the ground buss is negative, but unsure of the one on the AZ1 tube. Help?

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Toti.JPG
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 Post subject: Re: Italian Toti Radio Schematic help - Electrolytic orienta
PostPosted: Jun Wed 09, 2021 6:43 pm 
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Joined: Mar Thu 21, 2019 3:53 pm
Posts: 336
See the schematic below for correct polarity of the filter caps.


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Toti.JPG
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 Post subject: Re: Italian Toti Radio Schematic help - Electrolytic orienta
PostPosted: Jun Wed 09, 2021 6:55 pm 
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Joined: Jan Thu 06, 2011 6:32 pm
Posts: 408
Location: Bethpage, NY
Thanks! I had the bottom one in reverse. I will bump them both up to 30mfd as 8mfd seems too low of any value in filtering. Original top of chassis caps have no markings and the wires were cut at the base as if the prior owner was going to replace but never did. So was shooting in the dark! ;)


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