Vox_vt_series_manuals 电路图 维修原理图.pdf

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1、E2 收音机爱好者资料库 Ra d i o Fa n s .CN IMPORTANT SAFETY INSTRUCTIONS Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Mains powered apparatus shall not be exposed to dripping or splashing and that no objects filled with liq

2、uids, such as vases, shall be placed on the apparatus. Clean only with dry cloth. Do not block any ventilation openings. Install in accordance with the manufacturers instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers

3、) that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provi

4、ded plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. (for USA and Canada) Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. Only use attachments/ac

5、cessories specified by the manufacturer. Unplug this apparatus during lightning storms or when unused for long periods of time. Turning off the power switch does not completely isolate this product from the power line so remove the plug from the socket if not using it for extended periods of time. I

6、nstall this product near the wall socket and keep the power plug easily accessible. WARNINGThis apparatus shall be connected to a mains socket outlet with a protective earthing connection. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged i

7、n any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. Do not install this equipment on the far position from wall outlet and/ or c

8、onvenience receptacle. Do not install this equipment in a confined space such as a box for the conveyance or similar unit. Excessive sound pressure from earphones and headphones can cause hearing loss. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold wi

9、th the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. The lightning flash with arrowhead symbol within an equilateral triangle, is intended to alert the user to the presence of uninsulated dangerous voltage within the products en

10、closure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product

11、. CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type. THE FCC REGULATION WARNING (for USA) This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits ar

12、e designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. H

13、owever, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by o

14、ne or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV techni

15、cian for help. Unauthorized changes or modification to this system can void the users authority to operate this equipment. Notice regarding disposal (EU only) When this “crossed-out wheeled bin” symbol is displayed on the product, owners manual, battery, or battery package, it signifies that when yo

16、u wish to dispose of this product, manual, package or battery you must do so in an approved manner. Do not discard this product, manual, package or battery along with ordinary household waste. Disposing in the correct manner will prevent harm to human health and potential damage to the environment.

17、Since the correct method of disposal will depend on the applicable laws and regulations in your locality, please contact your local administrative body for details. If the battery contains heavy metals in excess of the regulated amount, a chemical symbol is displayed below the “crossed-out wheeled b

18、in” symbol on the battery or battery package. * All product names and company names are the trademarks or registered trademarks of their respective owners. 收音机爱好者资料库 Ra d i o Fa n s .CN 3 Table of Contents Introduction.4 Welcome!. 4 Main features . 4 Signal path. 5 What is Valve Reactor technology?

19、. 5 Quick start .6 Setup . 6 Checking out the preset programs. 7 Switching between the user programs. 7 Top and rear panels.8 A. Top panel . 8 B. Rear panel . 11 About the three operating modes.13 Preset mode (recalling preset programs) . 13 Manual mode. 13 Channel Select mode (recalling user progra

20、ms) . 14 Creating and saving sounds .15 Creating a sound . 15 Adjusting the noise reduction . 16 Saving a program . 16 Checking the original values saved in a program . 17 Restoring the factory settings . 17 Using a foot switch (VOX VFS5).18 Foot switch operations in Channel Select mode.18 Foot swit

21、ch operations in Preset or Manual modes .18 Explanation of the amps and effects.19 Amp models. 19 Effects. 22 Reverb . 24 Troubleshooting .25 Specifications .27 Song program list .28 Program sheet.29 收音机爱好者资料库 Ra d i o Fa n s .CN 4 Introduction Welcome! Thank you for purchasing the VOX VT15, VT30, V

22、T50 or VT100 Valvetronix amp. To help you get the most out of your new amplifire, please read this manual carefully. Get ready to enjoy the VT-series amazing guitar sounds! Main features The VT-series use Valve Reactor technology, and feature a power amp circuit con- taining a 12AX7 (ECC83) dual tri

23、ode valve (“vacuum tube”) that would normally be used in a preamp. This allows the amp to produce the true sound and feel of a bona fide all valve (tube) amp. Sophisticated modeling technology is used to provide twenty-two different amps. Twelve high-quality effects are built-in. Of these, reverb is

24、 available at all times, and three of the remaining eleven effects are “multiple effects” that allow you to use up to three effects simultaneously. Noise reduction can also be used simultaneously. You can create a sound using the desired amp and effect, and save it in memory as one of eight programs

25、 (two banks x four channels). Programs can be switched while you perform, either from the top panel or from a foot switch connected to the rear panel (Channel Select mode). For each amp model, three preset programs Basic Effected, and Song are provided, giving you a total of 66 programs (Preset mode

26、). The song programs reproduce the tones of classic hits played by famous guitarists. Manual mode lets you use the VT-series as a conventional guitar amp. The physical positions of the actual knobs will be reflected by the sound. An optional VOX VFS5 foot switch (sold separately) can be connected, a

27、llowing you to switch programs or turn effects on/off with your feet. The power level control lets you adjust the output wattage of the power amp. Even with the master volume set to the maximum so that the Valve Reactor power amp is loaded, youll still be able to adjust the volume without impairing

28、the tonal character. The external speaker out jack (VT50/VT100 only) lets you connect a guitar speaker cabinet (8 ohm) of your choice. The effect send/return jacks (VT100 only) allow you to connect your external effect processor in a loop connection. 5 Signal path Your guitar sound passes through th

29、e following sections. Refer to “Top and rear panels” (p.8) in conjunction with this illustration. EFFECTPRE AMP GAINVOLUME EFFECT MASTERPOWER LEVEL COMP /OCTAVE Select one of 22 MODULATION /DELAY REVERB VALVE REACTOR CLASS A or AB VALVE ECC83 (12AX7) FEEDBACK CIRCUIT Circuit is determined by Pre Amp

30、 selection What is Valve Reactor technology? The Valve Reactor circuit used in the power amp of this VT15/30/50/100 combo amp is based on new technology. Most of the sound creation and tonal shaping is performed in the digital domain, but the Valve Reactor power amp is 100% analog. Passing the guita

31、r signal through the analog-domain power amp stage is an important factor in capturing the feel and tone of the original amp for that model. Valve Reactors power stage is a miniature version of a true tube push/pull power amp. It uses a 12AX7 tube (dual triode; in other words, two vacuum tubes in on

32、e), and is similar to a true tube amp with an output transformer. Rather than connecting the vacuum tube directly to a speaker via an output transformer, the signal is converted by a virtual output transformer in which solid stage components emulate the output trans- former, and the final output sta

33、ge circuit is connected to a specially designed VariAmp power circuit. This allows the output of the power stage to be continuously varied from minimum output to maximum output. This VariAmp power circuit is completely transparent i.e., it does not modify the signal so the output tone will be the pu

34、re sound of a tube amp. The wide dynamic range seen in a conventional tube amp is also maintained. This dynamic range is a characteristic that is difficult to obtain from a solid-state amp; this is why a tube amp sounds more powerful than a solid-stage amp of the same output specifications. The outp

35、ut of the Valve Reactor power amp “reads” the constantly changing impedance curve of the connected speaker system, and feeds this information back to the vacuum tube. In response to this information, the operation of the amps tube stage will vary according to the speaker load (impedance). This too i

36、s an important element in the sound of a true tube amp. In addition to producing lively tube sound, “circuitry char- acteristics” distinctive of the full-tube power stage in the amp being modeled can also be simulated. These characteristics include class-A, class-AB, and power output. By adjusting t

37、hese characteristics (except for the power output, which the user specifies), every sound of that amp model can be faithfully reproduced. This power amp technol- ogy, for which a U.S. patent has been obtained, is unique to the VOX Valvetronix amps. 6 Quick start This Quick Start section is for those

38、 of you who would like to start using your new amp right away. This manual contains information that will help you take full advantage of your Valvetronix amp, so be sure to read the rest of it after youve read the Quick Start section. HINT: Illustrations of the top panel and rear panel are provided

39、 in “Top and rear panels” (p.8), so refer to them as you try out your amp. Setup 1.Turn the MASTER volume control on the amp all the way down. 2.Connect the included power cable to the rear panel AC power connector, and plug the other end into an AC outlet. 3.Plug the cable connected to your guitar

40、into the top panel INPUT jack. 4.Turn on the POWER switch. 5.Slowly raise the MASTER volume to adjust the volume. HINT: The rear panel POWER LEVEL control adjusts the output level of the power amp. This lets you adjust the volume while preserving the dis- tortion of the power amp. NOTE: There may be

41、 no sound for several seconds until the vacuum tube warms up. This is not a malfunction. 7 Checking out the preset programs 1.Press the top panel PRESET switch. The PRESET LED will light up(Preset mode). 2.Turn the AMP selector to select an amp model. A preset program for a sound that is typical of

42、each amp model will be recalled, and the GAIN, VOLUME, TREBLE, MIDDLE, BASS, and effect settings will switch auto- matically. HINT: The amp models are organized into two banks, each bank contain- ing eleven models (a total of twenty-two). Press the AMP switch to change banks. Each time you press this, the AMP LED will change to g