• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Fisher 500c - Trouble shooting tuner section

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ALBQ

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Joined 2003
mywebpages.comcast.net/gillespie147/AlbuquerqueAudio-MainPage.html
All,
I recently picked up a Fisher 500c receiver with the tuner section not working. The amp (aux) works fine and all of the tubes tested good on my tube tester. The symptom is all I get from the tuner is a loud hiss. I have the schematic and completed cursory voltage checks with my meter. Any ideas where to begin or does anyone have an electronic copy of the service manual? I have an oscilloscope on my bench but, could use a few hints on what signals I should expect to see where to get me started.
Thank you -ALBQ
 
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