Thread: Drake TR-4C - PTO problem
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Old 10th Feb 2019, 12:42 pm   #3
g4aaw pete
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Join Date: Jan 2008
Location: Birchington Kent, UK.
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Default Re: Drake TR-4C - PTO problem
Permeability tuned oscillator. AFAIK all the '4' series Drake rigs used this tuning method.
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