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AN SB-220 COMPENDIUM - Orca DXCC

3 Feb 2014 1 VA7JW AN SB-220 COMPENDIUM MODIFICATIONS & UPGRADES INSTRUCTIONS SCHEMATICS PHOTOS MATERIAL LISTS SOURCES of SUPPLY PERFORMANCE MEASUREMENTS by John White VA7JW Original: 17 November 2011 Rev 1: 13 June 2014 Rev 2: 3 Feb 2014 AN SB-220 COMPENDIUM 3 Feb 2014 2 VA7JW INTRODUCTION This COMPENDIUM is a collection of upgrades, modifications and performance measurements applicable to the Heathkit SB-220 RF Power Amplifier. These may be of interest to owners and users of this venerable and popular amplifier. The authors SB-220 amplifier was purchased from the original owner in 1988. The amplifier was complete, unaltered, fully functional and in very nice condition. Through the years 1992 to 1998 extensive work was undertaken to upgrade operational features, replace aging parts and tame parasitic oscillation tendencies.

AN SB-220 COMPENDIUM 3 Feb 2014 2 VA7JW INTRODUCTION This Compendium is a collection of upgrades, modifications and performance measurements

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