"Duck" telephone
I have recently acquired the telephone shown below, which has a fault resulting in a very loud buzzing (attached as an MP3 in a ZIP file). As can be seen from an expanded waveform from Audacity (as used to record it) it is basically a triangular wave (with dial tone from my PABX superimposed, though at a much lower level than the buzz).
Microelectronics, as shown in the image of the duck's giblets, are not my forte, so any pointers as to what to check would be appreciated.
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Mending is better than Ending (cf Brave New World by Aldous Huxley)
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