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CONVERSION/ UPGRADE KITS: Some Manley units can be modified to use different tubes when the original is no longer available, or can be updated (for example, conversion of an older 50db gain Voxbox to increase gain to 60db). There are also factory-installed options which may be added after initial purchase. These can be performed by the Manley Service Department, or can be done in the field by a QUALIFIED TECHNICIAN CAPABLE OF SERVICING HIGH-VOLTAGE TUBE ELECTRONIC EQUIPMENT. The DIY kits available include all necessary parts and instructions. Photos are available by email upon request.

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O-RING MODIFICATION FOR MASSIVE PASSIVE® EQUALIZER 60db upgrade kit for older Voxboxes Manley Variable Mu® Sidechain Highpass Mod KIT