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Old 26th Jan 2019, 6:07 pm   #15
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
Default Re: Ultra Model 50 (1937) Restoration

Quote:
Originally Posted by OldTechFan96 View Post
Is C17 the grid coupling capacitor for this radio? I have never seen one before the volume control.
Yes it is, so far as I can make out it's in that circuit position to prevent the detector diode from being cut off at anytime due to the cathode bias voltage.

Lawrence.
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