[Milsurplus] Couple things about the ARC cap in the ebay homebrew

[Jim Whartenby]

If you take a look at the 1961 GE SSB Handbook, PDF page 19, the SSB jr, uses a phase shift network.  See: https://www.worldradiohistory.com/BOOKSHELF-ARH/Technology/GE-Books/General-Electric-Sideband-Handbook-1961-Adobe.pdfThe given resistor tolerances are 1%, the capacitors are paralleled with trimmers so a guess is that the capacitors need a similar tight tolerance.  How these resistor values have held up over 60 years plus is anyone's guess but they are certainly not carbon composition resistors.  The act of soldering a CC resistor will certainly change it's value making it unsuitable for use in the phase shift network.
Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy 

    On Tuesday, July 29, 2025 at 10:23:20 AM CDT, kgordon2006 at frontier.com <kgordon2006 at frontier.com> wrote:   

 On 29 Jul 2025 at 9:31, Mark K3MSB wrote:

> 
> Hi Hue
> 
> Were those octal phase shift networks hermetically sealed or in a vacuum?
> 
> If either, then the resistors may be fine as they are not exposed to moisture.
> 
> 73 Mark K3MSB 

They are hermetically sealsd, but not in a vacuumn. As I remember it, the resistor values are 
NOT the common ones.

Ken W7EKB

> 
> 
> 
> On Tue, Jul 29, 2025 at 4:38AM Hubert Miller <kargo_cult at msn.com> wrote:
> 
> I have an unused B&W octal base, audio  phase shift thing like in this  xmtr. Knowing now about 
> how miserably the old carbon resistors like to drift from nominal values, i do wonder how far off 
> usable those phasing networks are now.
> -Hue Miller
> 
> 
> Sent from my Galaxy
> 
> 
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