National Radio Company NC-600 neutralizing condenser: interesting part

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emrr

Well-known member
Joined
Apr 12, 2006
Messages
8,525
Location
NC, USA
Interesting part footprint I've never encountered.  I spotted it in the 1947 National catalog. 

For neutralizing low power beam tubes requiring from 0.5 to 4 mmfd

In this case it's in parallel with another cap in a feedback loop.

13603519653_fc8360c289_c.jpg
 
A variable capacitor with a thumbnail adjustment? Interesting...
 
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