25th Anniversary Amplifier
Contents
1. leaving the stock values unaltered When running the amp wide open it is suggested to select the second position one degree of attenuation for extended tube Life Do not adjust the wattage control while playing guitar though the amp at high volumes because of potential volume spikes between switch positions Jewel Power Indicator If the lamp is Lit the amp is on This does not indicate the standby setting of the amp Note An amplifier may be plugged in and on but a malfunctioning or burnt out indicator will not show the amp is on Check the power cord and Power Switch if the jewel light is not on If these are connected correctly then check the main fuse If the main fuse burns out check for proper speaker connections If the fuses continue to blow the amplifier may need servicing Rear Panel Controls o Q Input Power F 120V 60HZ a 250 W O ON LEFT COM RIGHT BIAS ADJUST EAD IN mV FUSE 2A 250V IAS JACKS obBud bbe Bueitod ast eosin S phe Neon PERNT KS 029 O 4 OHM EXT CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN Ne ATTENTION aan DE CHOC ELECTIQUE NE PAS OUVRIF IG TO REDUCE THE RISK OF FIRE OR Nip E ME E To te AVERAGE BIAS TO 30mV WITH EVERY TUBE CHANGE AVIS POUR REDUIRE LE RISQUE INCENDIE OU DE CHOC ELECTROUE POWER STANDBY AND RE BIAS FOR 6LEGC EL34 6CA7 KT77 A NE PAS EXPOSER CET EQUPENENTALAPLIIEOUL HMO Fuse Blown fuses may indicate that the amplifier needs servicing Use only the type2. and rating specified on the back of the amplifier See the section on Service Notes for proper fuse servicing and replacement Power Switch This cuts off all power to the amplifier No filament current or tube voltages are supplied Standby Switch When this switch is in STANDBY the amplifier tubes are effectively turned off but are still being warmed by the filaments if the POWER is on Keep this switch set to STANDBY when powering on the amplifier for at least 2 minutes to allow the tubes to warm up This also helps extend the life of the tubes When set to ON the tubes are turned on and the amplifier can be used Always check this switch if the amp is ON but no sound is being heard Bias Jacks Biasing and Tube Replacement should be performed only by a qualified technician Speaker Jacks Get into the habit of checking these first The jacks include a connection for 4 8 and 16 ohm loads There is an extension EXT jack with the 4 ohm and 8 ohm connection to connect two 8 ohm loads if you wish This scenario could most commonly be the use of an 8 ohm extension speaker along with the internal speaker connect each to the 4 ohm jacks since their combination produces a 4 ohm load Do not connect an 8 ohm Load in the 8 ohm jack along with a 4 ohm or 16 ohm load in those jacks This procedure halves the reflected impedance of each and will not allow ideal operating conditions If you are using more than one speaker they must be the same impeda
3. Tech Specs 25th Anniversary Amp 50 Watt 100 Watt Power usage 250 Watts 350 Watts Pre Amp Tubes 3 each ECC83 Power Tubes 2EA EL34 4EA EL34 Power Tubes should be purchased as matched sets Use only tubes in pairs or quads that are factory matched Failure to use matched tubes can Lead to tube failure and amplifier damage or abnormal operation Main Fuses 120V 60Hz 2A 250V Type 3AG 4A 250V Type 3AG 2 each I0A 250V Type 3AG 2 each 500mA 250V Type 3AG B Fuses 2 each 500mA 2 each IA 440V Type 3AG 440V Type 3AG Filament Fuses Weight Head 34 lbs 15 5kg 40 Lbs 18 2kg Dimensions Head 22 5in X Ilin X 22 5in X Ilin X 9 75in 9 75in Service Notes Tubes Tubes are consumables as they have a given usable lifespan They are part of the heart of the tone so keeping correctly operating tubes is essential Tubes can fail catastrophically or gradually and it s good to know what to look for if they start to go bad Periodically inspect them and look to see if anything inside the tube is glowing cherry red other than the normal orange glow of the filament This would indicate a situation where the tube is conducting more current than it is capable of handling and most likely about to fail Two other conditions to observe are filaments not glowing or 2 a miniature fireworks display inside the tube Any of the above conditions indicate serious problems with the tube and should be taken care of immediately Tubes quite often are t
4. any adjustment but the power tubes will need rebiasing to assure proper operation After power tube replacement initially inspect the tubes often to assure there are no cherry red components within the tube Tubes today can have a wide variety of tolerances and a re bias is highly recommended with new ones Fuses There are five fuses installed in the amplifier Only one of these the main input fuse is accessible and replaceable by the user There are four fuses internally for added safety Two of these fuses are high voltage fuses and two fuses are for the lower filament voltages In all cases labels indicate the type and rating of the fuse Replacement fuses MUST BE THE SAME TYPE AND RATING If they are not you can permanently damage your amplifier Please contact your local PRS dealer or the PRS accessories web site for information on ordering replacement fuses Instructions for Qualified Service Technician Replacement of internal fuses requires removal of the back panel and removal of the chassis First ensure the power cord is not plugged in then remove the back panel with a screwdriver Turn the amplifier upside down and place ona padded and safety certified work surface Loosen the 4 bolts holding the chassis to the top of the cabinet Check that all components are cool so that burns do not occur Then by holding onto the transformers Lift the front of the amp so the front control is out of the cabinet and carefully pull the chassi
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6. ently playing through That said after Doug and got several of the prototypes finalized sold some of my old coveted Live and studio amps because ours sounded considerably better The next step was to take the prototypes to musicians who are known for their amplifier tone as well as their playing What s interesting is that when spoke to these artists about trying the amps they all said the same thing Sure l U use them if love them In a real way amplifiers are musical instruments They are the devices that amplify the sound of the player s hands the guitar and possibly the pedal board They must share many qualities They must work they have to have a beautiful balance of bass midrange and treble the highs should be sweet not harsh they should be easy to operate and be highly musical In addition amps should clean up really well when you turn your guitar down The final quality that Doug and looked for are amps that sound good no matter where the knobs are It is a rare quality that we insisted on hope this hand crafted amplifier gives you years of enjoyment musical results and pride in ownership appreciate your confidence Using your PRS Amplifier IMPORTANT Before using your amplifier refer to the IMPORTANT SAFETY INSTRUCTIONS insert supplied with the product Powering Up Make sure your speaker cabinet is connected to the correct speaker output impedance jack with a high quality spea
7. he cause of spurious noise in the amp Microphonic tubes will squeal or rattle with the vibrations of the cabinet If suspected tap each tube lightly with a pencil with the amp powered up the suspect tube will let you know Note that there is a normal metallic clinking when doing this but a microphonic tube will be quite loud Instructions for Qualified Service Technician To install the tubes check that the power cord is not plugged in then remove the wooden back panel with a screwdriver and notice the tube sockets Note that the cooling fan may need to be unplugged from the chassis Looking from the back install the Power tubes EL34 6L6 etc in the left sockets In each case align the center pin guide correctly with the socket making sure that the pin guide key fits with the corresponding slot in the socket The ECC83 preamp tubes can then be placed in the smaller 9 pin sockets to the right of the power tubes Please refer to the tube chart inside the amplifier for proper tube locations Be aware of the pin alignment with these as there is only one way they can fit We utilize tube sockets that allow relative ease of tube installation but never force tubes into the sockets if there becomes a problem Also never torque the tubes only gently rock them from side to side during insertion or removal After preamp tube installation place the cylindrical spring tension preamp tube covers over the tubes Replacing preamp tubes will not require
8. ker cable Do not use guitar cords 2 Make sure the power cord is connected to the correct grounded outlet 3 Make sure there is at Least 6 inches of clearance behind the amplifier to allow for proper cooling Never place the amplifier against a wall or other equipment and keep it clear of other heat sources such as other amplifiers or stoves Make sure there are no flammable items such as curtains behind the amp Do not drape items over the amp that can prevent proper cooling Do not set drinks or other liquids on top of the amp that can spill into the amp 4 To increase the life of the tubes set the Standby switch to the STANDBY position before powering on Turn the POWER switch on and let the amplifier warm up for 2 minutes before setting the standby switch to ON If this is the first time you are turning on the amp check to see if all of the tubes are glowing 5 Plug in the guitar cable turn the volume knob down and turn the standby switch on Wait a few seconds for the bias to settle Bring the volume up and play some tunes 25th Anniversary Amplifier Front Panel Controls ARIDO INPUT TREGLE GAIN BASS GAIN TREBLE MIDDLE BASS PRESENCE WATTAGE Input 4 standard guitar cord Treble Gain The circuitry is configured like a vintage two channel amplifier that has been bridged with a Y cord The treble gain acts like the volume of the brighter channel It can be used Like an additional tone knob to adjust the o
9. nce For example use two 4 ohm speakers or two 8 ohm speakers Never use 2 different speaker impedances You should not mix and match The maximum number of speakers you can safely connect is 2 Always ensure that the speaker impedance matches the correct speaker jack since this amp is designed to be played wide open Mismatching impedances from a Lower tap to a higher speaker impedance stresses the amp more than going into a lower impedance mismatch and can cause arcs on the tube sockets failure of power tubes or even failure of the output transformer Confirm that the speaker cabinet you are using matches to the correct speaker jack on the back of the amp For the 4 OHM and 8 OHM speaker jacks a second cabinet may be plugged into the EXT Extension cabinet Note The total speaker impedance must be determined before connecting to the speaker jacks 2010 PRS Guitars All rights reserved Paul Reed Smith PRS the PRS Logo the PRS Paul Reed Smith logo the Paul Reed Smith signature the bird inlays the headstock bird the PRS headstock shape the PRS body shape the PRS scoop design Singlecut Mira and the SE are all registered trademarks of Paul Reed Smith Guitars Custom 24 Modern Eagle SE Custom SC 245 SC 250 Starla Tonare Sewell Blue Sierra and Angelus are all trademarks of Paul Reed Smith Guitars The Birds New Birds
10. s out NOTE Capacitors may retain an electric charge and can be dangerous even when the unit is off unplugged and has not been played for an extended period of time USE CAUTION Locate the fuse holders remove them and check for continuity Blown fuses can indicate a failure condition and should be treated as though a problem exists Check the label for the proper type and rating After all fuses have been replaced and the amp is tested as acceptable and safe reinstall the chassis by working in reverse Be sure to replace the reverb pan and hardware then plug the reverb cords back into place Before installing the back panel ensure the cooling fan cord is plugged into the proper jack 100 watt only Chou 25th Anniversary Guitar Amplifier User s Manual agrare Back in 2006 was at the Dallas Vintage Guitar Show and my band was scheduled to perform a few times A friend said Hey You need an amp to play through and have a friend who makes great amps He took me to the booth of a Texas amp builder Doug Sewell Loved the way his amps sounded and after barely saying hello Doug and were inside rewiring the amp was going to play through Since that day Doug and have spent years rewiring and Listening to every single possible variation to finalize the circuits Our goal was to have highly usable and musical amplifiers am not an amp collector am an amplifier user who keeps the amps am pres
11. verall tone in a brighter or darker fashion relative to the bass channel gain control Bass Gain As noted above this volume controls the internal bass channel that is linked to the treble channel Increase this channel s volume relative to the treble gain control to adjust the overall tone of the amp in a brighter or darker fashion Treble The treble control is very sensitive in both clean and dirty settings Like all of the control knobs there are no numbers to encourage you to set the amp with your ears Middle Using less mids creates crisper more hollow sounding tones Clean settings using less mids can sound very American working well with single coil tones for clean blues and country Adding mids transforms the tone to a warm fatter jazz approved tone Distortion with more mids can sound very 60s and 70s less mids ventures into 80s metal tones Bass The low end control allows you to tailor the amount of bass appropriate for the speakers and cabinet you are playing through Inherently bassy cabinets can sound very boomy with high bass settings on the amp Open back cabinets generally can accept higher bass settings without this Presence An additional control to adjust the overall brightness and high end gain of the amp Wattage This six position switch acts as a voltage divider in the phase inverter to incrementally reduce the drive signal going to the power tubes The Last position disconnects the switch from the circuitry
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