Ohmite Mfg Co 

The image demonstrated is illustrative of all the shading contrasts among new and old. Guitar sign showed in pink moves the cylinder around the left " high voltage resistors." The guitar signal streams by means of the Grid Stopper resistor into the cylinder Gridout the cylinder Plate, all through the Coupling capacitor, and to another amp circuit. 

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Web: https://www.hv-caps.com/products/High-Voltage-resistor-Flat-Style.html