Tube audio oscillator troubleshooting

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Tube audio oscillator troubleshooting

Post by 6stringer on Sun Nov 22, 2009 2:24 pm

I have a Heathkit A0-1 Audio Oscillator that my father built in the '50s, I replaced the caps and cleaned up the switch contacts and it seems to work ok except the sine wave shows some distortion on a scope. I am a beginner and have no idea about how to troubleshoot this circuit to find the trouble. I've searched the internet and can only find info on how to use the audio oscillator as a troubleshooting tool, nothing on how to trouble shoot a tube audio oscillator. Thanks in advance for any help or direction you can share.
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Re: Tube audio oscillator troubleshooting

Post by MinnesotaHam on Sun Nov 22, 2009 10:33 pm

Define what the distortion looks like.

Many inexpensive generators have a less then perfect looking sine wave envelope, especially on the high frequency bands.
Even better if you can display a picture of it.

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Re: Tube audio oscillator troubleshooting

Post by Resistance is Futile on Sat Nov 28, 2009 12:41 am

your distortion should not exceed 0.6 % in the audio range.
do you need a schematic?
Click here. it will ask you to type in a set of numbers before it downloads. there are two files, one is a schematic and the other is a picture of the case. they are zip files and contain GIF files (graphics).

http://www.vintage-radio.info/download/download.php?dir=heathkit&file=ao-1.zip
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Re: Tube audio oscillator troubleshooting

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