Weber Copper Cap Rectifiers are solid state rectifier replacement devices for use in place of vintage tube rectifiers. Each model emulates the forward conduction resistance curve of the tube type it replaces and also has linear in-rush current limiting to simulate the warm-up of a tube rectifier, however, it is in the 1 to 2 second range, rather than the 7 to 9 seconds of a typical rectifier tube. The envelopes are solid hard-drawn copper with a high thermal capacitance that allows a 100% continuous overload condition.

The Copper Cap emulates a tube rectifier, but it does not require filament power. In the case of a 5U4, for instance, this is a savings of 15 watts. The power transformer will run cooler and last longer. While the filament and coating on the cathode of a tube rectifier are destined to eventual failure, a Copper Cap will last the lifetime of the amp when used properly. Additionally, close tolerance parts are used in all Copper Cap models; no hand sorting is necessary.

To install an octal, 7, or 9 pin Copper Cap rectifier, simply remove the existing rectifier and replace it with the Copper Cap. Make sure the tube rectifier is cooled down before you remove it. 

Installation of the Module Type Copper Cap Rectifier requires knowledge of high voltage power supplies and the precautions of working with potentially lethal voltages. We do not recommend the installation of our module type Copper Cap Rectifiers unless the customer is skilled in those areas.  To wire in a module type Copper Cap rectifier requires an understanding of the high voltage supply in your particular amp. In the case of a full wave rectifier supply, simply connect the two orange wires from the Copper Cap module to the high voltage winding from the power transformer. Next, find the point where the full wave diodes connect to a wire that feeds the high voltage to the filter capacitors and the rest of the B+ circuit. Disconnect that wire from the two diodes and connect it to the red wire from the Copper Cap module. It is not necessary to remove the original diodes from the circuit.

For the bridge type Copper Cap module, connect the orange wires to the high voltage winding wires coming from the power transformer. Connect the red wire from the Copper Cap module to the wire in the circuit going to the filters and B+ circuit. Connect the black wire from the Copper Cap module to a convenient power ground point. It is not necessary to remove the bridge diodes from the circuit, but you must disconnect the wire feeding the B+ circuit from the diodes so it can be connected to the red wire from the Copper Cap module.
Picture of Copper Cap Module mounted in amp