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You really don't need a sweep generator to align the audio IF, if you have a scope that has a bandwidth of 30 mHz or so. Just make sure the LO is right, hook up a signal source, and put the scope probe on one of the plates of the audio detector tube. Peak the audio IF transformers for maximum level. Don't mess with the discriminator transformer secondary if you can avoid it, or just touch it up to minimize the buzz.
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