WESTON 686
POSSIBLE LOCATION OF SPECIAL BUTTONS OR LINKS TO SPECIAL THINGS

WESTON 686 TYPE 10A
S/N 1521 shown*

The Weston 686 is a direct Gm reading tube analyzer.  It was preceded by the Type 9 and a variety of others, and was produced as a military type for the US Navy, as the OD version.  There were several earlier military versions as well.

Gm is read directly on the fan shaped meter without any calculations needed.  The meter has 8 effective full scale Gm readings of 300, 600, 1,500, 3,000 and x10 ranges of 3,000, 6,000, 15,000, and 30,000 micromohs.

This industrial tube analyzer used 60Hz signal for the grid circuit and a handful of separate filtered and monitored DC power supplies for various element voltages, which were read on the switched meters. It also featured both low and high power grid settings, and a variety of other enhancements to evaluate virtually all of the tubes of the day.

*the unit displayed hails from Alan Douglas' shop, graciously donated to my museum by Jim Mongahan
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QUICK LINKS
  • Alan Douglas Writeup
  • Link to Schematic
  • Link to operating summary
  • Tubes: 3A4, 6CB6, 6C4, OB2, 6X4, 5U4G
  • Dynamic Mutual Conductance
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