For the discriminating guitarist who demands a power amp featuring an all tube design, we proudly introduce the Velocity® Valve. Featuring a design by Egnater Amplification, the Velocity Valve arrives with a solid reputation built on two of the industry’s most highly regarded guitar gear companies. The Velocity Valve features 90 watts/channel built into a two rack space chassis that boasts an extremely durable design and of course features many slick extras like: three 12AX7 preamp tubes, four 5881WXT power tubes for each channel, heavy-duty rack handles, separate standby switches per channel, one volume level control per channel, 4,8, and 16 ohm impedance selectors for each channel, and two outputs per channel, Unlike many rack tube amps available today, the fan allows even cooling of all tubes at all times for even wear and maximum tube life. Each channel also contains a “Presence” control to add more cut and an exclusive “Density” feature goes beyond an ordinary EQ boost since it is integral to the amp’s feedback loop, which means it will remain tight and punchy without getting sloppy with virtually any guitar cabinet. If tubes are the way you choose to play, you owe it to yourself to check out the new Velocity Valve. –
SPECIFICATIONS: Output Power 121 watts per channel (@10% distortion) – 97 watts with both channels driven (@10% distortion), Input Impedance 100 ohms, Input Sensitivity -13dBu (173.4VRMS) for rated output at max gain, Output Impedance 4 ohm, 8 ohm and 16 ohm (selectable on each channel), Maximum Gain 43dB, Noise Floor -80dBr (ref 1W), Dynamic Range 99dB (typical), Fuse Replacement MAIN: 8A slo blo – H.T.: 1.5A fast blo, Frequency Response +0/-5dBu, 20Hz to 20kHz, Current Consumption 5.5A @115VAC (632 watts), Operating Voltages 100VAC, 117VAC, 230VAC, Presence +4.5dB @3kHz, Density +4.0dB @100Hz, Dimensions 3.48″H, 19.00″W, 14.00″D, Weight 40lbs
Guitar Power AmplifierUSER’S MANUAL
Copyright © 1997 RSP Technologies All Rights Reserved.
Your Velocity® Valve has been tested and complies with the following Standards and Directives as set forth by the European Union:
This means that this product has been designed to meet stringent guidelines on how much RF energy it can emit, and that it should be immune from other sources of interference when properly used. Improper use of this equipment could result in increased RF emissions, which may or may not interfere with other electronic products.To insure against this possibility, always use good shielded cables for all audio input and output connections. Also, bundle audio cables separately from the AC power cables. These steps will help insure compliance with the Directive(s).
Congratulations on your purchase of the Velocity® Valve power amp! This amplifier is the result of a collaboration between Rocktron and world-renowned amp/preamp designer Bruce Egnator, known for his work with many of the industry’s top performers.
Careful measures were taken in the design phase of the Velocity Valve to ensure years of trouble-free performance with low maintenance. This Class A-B amp design features a faceplate design with stacked channels yielding extremely quiet operation. Each channel contains four 5881 power tubes to provide 80 watts of clean power (see Specifications for more power ratings).
Controls for Volume, Presence and Density are available on each channel. Density provides thickness in the low frequencies, adding body to your tone. Presence renders a smooth upper frequency cut which adds clarity to your sound. Since these controls are located in the last stage of your guitar signal (between the amp cabinet), their effect differs greatly from similar tone adjustments used in the preamp phase. We think you will find these adjustments very useful in the shaping of your tone! Also, since each channel has its own secondary supply, a separate Standby switch is available on each channel as well.
On the rear panel, one input and two parallel speaker outputs are provided for each channel. This allows the use of multiple cabinet combinations. Each channel also provides a 4W/8W/16W impedance selector for proper matching of the load to the amplifier. (Please refer to Impedance Settings for examples of proper impedance matching. Improper settings can result in serious damage to the amp which will void the warranty.)
This user’s manual will detail the various features and functions of the Velocity® Valve. Please keep it for future reference.
Velocity® Valve front panel
- VOLUME control (Ch. 1) – This control determines the output level of Channel 1.
- PRESENCE control (Ch. 1) – This control determines the high-end content of Channel 1.
- DENSITY control (Ch. 1) – This control determines the low end (or body) of Channel 1.
- STANDBY switch (Ch. 1) – This switch disconnects the supply voltage going to the tubes in Channel 1. With the Standby switch in the OFF position (down) and the Power switch ON, the heaters on each tube remain on—keeping the tubes warm. With the Standby switch ON (up), the voltage required to have the tubes operate now passes through to the tubes and allows the signal to pass through to the output.
- VOLUME control (Ch. 2) – This control determines the output level of Channel 2.
- PRESENCE control (Ch. 2) – This control determines the high-end content of Channel 2.
- DENSITY control (Ch. 2) – This control determines the low end (or body) of Channel 2.
- STANDBY switch (Ch. 2) – This switch disconnects the supply voltage going to the tubes in Channel 2. With the Standby switch in the OFF position (down) and the Power switch ON, the heaters on each tube remain on—keeping the tubes warm. With the Standby switch ON (up), the voltage required to have the tubes operate now passes through to the tubes and allows the signal to pass through to the output.
- PILOT light – When lit, this jeweled light indicates that the Velocity Valve is powered and ready for operation.
- POWER switch – This switch powers up the Velocity Valve. When powering up the unit, make sure the Standby switches (4, 8) are in the OFF position. Allow 30-45 seconds to allow the heaters on the tubes to warm up to operating temperature. After this period , turn the Standby switches ON for operation. (Note: A load (speaker) must be connected to the speaker outputs when the amplifier is being used.)
Velocity® Valve rear panel
- POWER INLET module – This module provides a connection for the power cord, and also houses the mains fuse. (For information about changing the fuse, see Tube/Fuse Replacement.)
- Internal BOXER fan – Internal to the amp is a boxer fan which draws air to the power tubes.
- HIGH TENSION fuse (Ch. 1) – The H.T. (High Tension) fuse is the circuit breaker for the supply voltage fed to the tubes for Channel 1. (Replace only with a 1.5 amp fast blow 1.25″ X 1.25″ fuse.Replace with amplifier powered down only.)
- HIGH TENSION fuse (Ch. 2) – The H.T. (High Tension) fuse is the circuit breaker for the supply voltage fed to the tubes for Channel 2. (Replace only with a 1.5 amp fast blow 1.25″ X 1.25″ fuse.Replace with amplifier powered down only.)
- Channel 1 INPUT jack – This standard ¼” jack provides an input to Channel 1, usually from the output of a preamp or the last device in a chain of effects.
- IMPEDANCE switch (Ch. 1) – This switch selects the proper impedance to match the load with the output of the amplifier. (See impedance chart, figure 3.)
- Channel 2 INPUT jack – This standard ¼” jack provides an input to Channel 2, usually from the output of a preamp or the last device in a chain of effects.
- Speaker OUTPUT jacks (Ch. 1) – The Speaker Main and Extension Speaker jacks provide the outputs to Channel 1. Both jacks are internally wired in parallel. When only one cabinet is used for each channel of the amplifier, the cabinet must be connected to the Speaker Main jack. Set the impedance switch to the proper impedance according to the chart in figure 3.
- IMPEDANCE switch (Ch. 2) – This switch selects the proper impedance to match the load with the output of the amplifier. (See impedance chart, figure 3.)
- Speaker OUTPUT jacks (Ch. 2) – The Speaker Main and Extension Speaker jacks provide the outputs to Channel 2. Both jacks are internally wired in parallel. When only one cabinet is used for each channel of the amplifier, the cabinet a must be connected to the Speaker Main jack. Set the impedance switch to the proper impedance according to the chart in figure 3.
The IMPEDANCE switches on the output of each channel must be set to match the proper speaker load that is connected to that channel. (For example, if your speaker cabinet is 8 ohms, set the IMPEDANCE switch to “8”.)
Use the chart below to determine the proper setting of the IMPEDANCE switch for your particular speaker configuration.
- If one speaker cabinet is used for each channel, the cabinet must be connected to the SPKR MAIN jack. If two cabinets are connected to a single channel, remember that both output jacks are wired internally in parallel. If SPKR MAIN is not used no signal will be present and possible damage to the Velocity Valve may result.
- It is important that the speaker configuration used does not result in a load of less than 4 ohms.
|IMPEDANCE settings when
using 1 cabinet per channel
|IMPEDANCE settings when
using 2 cabinets per channel
Proper IMPEDANCE switch settings
The Velocity Valve is shipped with eight 5881 power tubes and three 12AX7 preamp tubes. Replacing any of these with alternative tube types will void the warranty. If you suspect a problem with the tubes, please contact our Customer Service department.
Always replace the main fuse with an identically rated replacement. Your Velocity Valve amplifier uses a 5x20mm, 8A amp, 250V slow-blow fuse (4A, 250V slow-blow for 230VAC). The fuse is located immediately below the line cord inlet on the rear panel and can be accessed by removing the fuse cover module as shown below.
|1. Use a small flat screwdriver as shown to slide the fuse cover out from the power inlet module. The fuse can be found inside the fuse cover module after it is pulled out.Note: A small compartment is also provided within the fuse cover module for storing a spare fuse.2. After replacing the fuse with another of identical specifications, push the fuse cover module fully back into place, ensuring that the fuse has snapped onto the fuse holder inside the power inlet module.|
- Please note the following precautions before operating your Velocity® Valve.
- When operating with one cabinet per channel, always use the SPKR MAINS jack for the speaker connection.
- Do not operate either channel below 4 ohms.
- Never operate the Velocity Valve without a load on the output.
- Always be certain to use speakers or speaker cabinets capable of withstanding the power that the Velocity Valve is capable of providing. Rocktron is not responsible for speaker failure resulting from the use of this equipment.
- Never connect two output of the amplifier to the same speaker. This would be equivalent to shorting the outputs of the amplifier together and would shut the unit down immediately.
- Plug and unplug speaker outputs with the power amplifier OFF.Temperature Considerations
- Note that the power tubes at the rear of the Velocity Valve generate considerable heat when operating the amplifier. DO NOT TOUCH these tubes during (or soon after) operation! Failure to heed this warning may result in severe burns!
- Always keep rack well ventilated.
- Do not let cables rest on power tubes.
Using the Velocity® Valve with two cabinets per channel
Using the Velocity® Valve with one cabinet per channel
Output Power 121 watts per channel (@10% distortion) 97 watts with both channels driven (@10% distortion) Input Impedance 100 ohms Input Sensitivity -13dBu (173.4VRMS) for rated output at max gain Output Impedance 4 ohm, 8 ohm and 16 ohm (selectable on each channel) Maximum Gain 43dB Noise Floor -80dBr (ref 1W) Dynamic Range 99dB (typical) Fuse Replacement MAIN: 8A slo blo - H.T.: 1.5A fast blo Frequency Response +0/-5dBu, 20Hz to 20kHz Current Consumption 5.5A @115VAC (632 watts) Operating Voltages 100VAC, 117VAC, 230VAC Presence +4.5dB @3kHz Density +4.0dB @100Hz Dimensions 3.48"H, 19.00"W, 14.00"D Weight 40lbs