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 Post subject: high voltage on 2nd detector
PostPosted: Apr Wed 08, 2020 12:18 am 
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Joined: Apr Wed 08, 2020 12:02 am
Posts: 7
Location: central Texas
Hello, i have a Crosely 516. I have high voltage on plate of the 2nd detector, 76 tube. I have 150V. and schematic says it should be 86V. The cathode is also about twice as high. I changed all caps and a few resistors. All other tubes measure in spec. I also changed the damaged speaker and output transformer. It came from another Crosley. Could that high voltage just be a bad tube. I have no way to test tubes. Thanks. Gary Ketterman.


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 Post subject: Re: high voltage on 2nd detector
PostPosted: Apr Wed 08, 2020 12:31 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 30554
Location: Livermore, CA
Hi and Welcome Gary

Crosley 516 with 76 tube has a 300K plate resistor. This large of a resistor makes a voltage divider with the meter. Older meters loaded voltage more than your modern one.

Does the radio operate?

http://www.nostalgiaair.org/pagesbymode ... 003374.pdf

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Norm


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 Post subject: Re: high voltage on 2nd detector
PostPosted: Apr Wed 08, 2020 12:39 am 
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Joined: Jul Mon 26, 2010 8:30 pm
Posts: 28186
Location: Annapolis, MD
If the cathode voltage is 2X too high, that's more of a concern (lower impedance--less dependent on type of meter.) But: "does it work?" trumps other questions.....

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-Mark
"Even if you don't understand Ohm's Law, you are still required to obey it."


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 Post subject: Re: high voltage on 2nd detector
PostPosted: Apr Wed 08, 2020 1:03 am 
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Joined: Apr Wed 08, 2020 12:02 am
Posts: 7
Location: central Texas
Yes, the radio picks up about 3 stations now.


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