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Public Disclosure Information For WeberVST Products
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In lieu of patents, WeberVST has chosen to publicly disclose certain aspects of the designs of its products.
Most WeberVST designs employ common electronic components. Those components may be replaced by a competent technician and are readily available from major electronics distributors or from WeberVST.
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Curve Kits consist of inductors, resistors, and capacitors designed to modify the frequency range of the signal applied to the loudspeaker.
The Curve Kits are available in three frequency ranges: Lows rolled off, Mids notched out, and Highs rolled off.
The Load Dump is a combination of resistors and capacitors that reduce or attenuate the signal going to the loudspeaker. The purpose of the Load Dump is to allow the user to turn the amplifier to a high volume setting so as to cause power tube distortion, and then reduce the actual electrical signal going to the speaker to ensure a low volume from the speaker.
The frequency response of the Load Dump approximately follows the hearing loudness curve as described by Fletcher and Munson. The standard Load Dump has a fixed attenuation of 6db, however, a continuously variable attenuation is available as an option.
The Speaker Silencer is a switch and a power resistor. The switch switches a loudspeaker into the circuit, or substitutes a power resistor into the circuit in place of the loudspeaker.
The Beam Blocker is a device that consists of a metal beam that spans the diameter of the loudspeaker face and a metal disk that is attached at the midpoint of the metal beam. A fiber dome is attached to the metal disk and is pointed inward towards the speaker cone. The purpose of the Beam Blocker is to diffuse and partially absorb the high frequencies that beam directly out from the center of the loudspeaker.
The Pedal Pump Power Supplies use standard 78xx series voltage regulators that are adjustable between approximately 6VDC and 12VDC. Each regulator circuit and power supply has a power transformer which isolates it from other regulator and supply circuits.
Each regulator has a resistor in series with the output to safeguard against high currents in the event of a shorted output.
The Pedal Host Board has up to 8 DIP switches OR'd onto a common buss that provides the coding or selection of the pedal loops. Each DIP switch has an accompanying momentary footswitch. When a particular footswitch is depressed, its accompanying DIP switch is placed
on the buss and the loops selected by the DIP switch are placed on line, or in the signal chain. The GBA circuit is a gain-buffer-atenuator that has from a 20db cut to a 20db gain effect on the signal output of the pedal host board.
The GBA consists of resistors and low noise operational amplifiers.
The Field Coil Power Module consists of a diode bridge, a diode voltage doubler, and a string of zener diodes to
reduce the voltages to the level required by a particular vintage field coil loudspeaker.
The Emag Loudspeaker employs a coil of wire that is used in concert with a permanent magnet to boost the magnetic energy of the permanent magnet. The Emag coil gets energized by the current flowing through an accompanying copper cap rectifier.
The resistance of the Emag field coil is the same as the standard copper cap rectifier used and the field coil resistance takes the place of the power resistors that are in the standard copper cap rectifier.
The MASS loudspeaker load box consists of a coneless loudspeaker, several potentiometers, resistors, and capacitors.
The purpose of the MASS is to allow the user to reduce the power level of the signal going from the amplifier to the loudspeaker, while providing a load to the amplifier that is most similar to a loudspeaker.
Because the coneless loudspeaker in the MASS is a loudspeaker, it provides a very accurate load to the amplifer. A reduced level sample of the signal is available as a DI (Direct In) output. The DI output is provided
with signal conditioning of Bass, Mids, and Treble controls as well as a volume control. The loudspeaker output is continuously adjustable from zero volume to full volume.
The Fourhead Products consist of relays and switching circuitry that allow mutually exclusive selection of
connecting one of four sources to one target (Fourhead Amp Switch and Dummy Load), or one source to one of four targets (Fourhead Director). Through a buss system, the input from the remote footswitches select a specific relay while automatically de-selecting all other relays.
Additionally, in the Fourhead Amp Switch and Dummy Load, four 100 watt resistors are connected to the individual relays that are de-selected.
The Copper Cap Rectifier consists of rectifier diodes, resistors, and thermistors. The purpose is to emulate the rectification and forward transfer resistance of a vacuum tube rectifier.
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Content © 2002-present, WeberVST
First Posted -- 04-22-2002 Last Updated -- 05-03-2004
**Trademark and Patent Notice:**
WeberVST, Blue Dog, Blue Pup, Silver Bell, Silver Ten, Classic AlNiCo, AlNiCo 'Plus', Emag, NeoMag, Perfect Circle Entertainment, MyTone Custom Speakers, Tonegear, Tonegear Products, Tonegear.com, and Tonegear Web Hosting are trademarks of Weber Vintage Sound Technology. Ferromax and the three-tiered annularly slotted loudspeaker basket, (more commonly known as "the hotdog slotted basket"), are registered trademarks of Weber Vintage Sound Technology.
Content © 1996-present Weber Vintage Sound Technology
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