[Johnson] Another Invader VFO Question

[David C. Hallam]

I have found a discrepancy in the Invader VFO schematics.  The early 
versions of the schematic (1/61 and 5/62) and parts list give the pair 
of VFO tube coupling capacitors as both 400 pF mica.  Later versions of 
the schematic (2/63 and 11/64) give them as a 400 pF and a 100 pF.  I do 
not have a later part list to see if it has been changed.  So, I don't 
know if this is an undocumented factory change, Johnson often did this, 
or an error that crept into the schematic.

I am working on an Invader with the vernier dial VFO which I am assuming 
is a late model.  It has both capacitors 400 pF.

Does anyone know if the different values is in fact a factory change?

I guess it's not a hard an fast rule, but I thought the two tube 
coupling capacitors in a series tuned Colpitts oscillator circuit were 
equal in value.

David
KW4DH

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Thomas Jefferson