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Old 20th August 2005 | 09:45
  #15 (permalink)  
BOAC
Per Ardua ad Astraeus
 
Joined: Mar 2000
Posts: 18,575
Likes: 4
From: UK
Somebody call?

On the 'older' HF sets, the tuning circuit is actually rotating a variable tuning capacitor (blade type?) while it 'whistles'.
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