JAN-Cetron 5R4WGBThe JAN-Cetron 5R4WGB tube is a industrial version of the 5R4 tube. It has a huge silicon filled base and extra thick glass to greatly reduce vibration. Replaces any 5R4 tube, but make sure it will physically fit into your application. Seated it measures 4 5/8" tall by 2 1/16" wide. 
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