HP 204c Oscillator

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You should see 5Vrms output with an AC voltmeter if the output level control is advanced to max and frequency is set anywhere within the voltmeter's capability. If you have a small tube amplifier output transformer, you could use it as an ad-hoc speaker matching transformer. It won't be loud -- output power is only 10mW max.

Here's the manual: http://bama.edebris.com/download/hp/204c/HP%20204C.pdf
 
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