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Check on Ebay and see what they have there. Ive got an Eico 147 signal tracer that I picked up a few years back for $30 to replace one that was so well-used the selector switches were worn out. The 147 traces RF, AF, and has a test speaker, test amp, wattmeter functionality, and even a test speaker function with built-in output transformer. All in all, a handy piece of test equipment.
I also have the solid state version, the Eico 150. It works well, but I prefer the more robust tube-based 147 model.
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