Ampeg B-15 Musical Instrument Amplifier User Manual
Contents
1. O MODEL 15 BASS AMPLIFIER HAND BUILT IN THE USA Owner s Manual ME nma Heritage B 15 Bass Amplifier IMPORTANT SAFETY INSTRUCTIONS Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with a dry cloth Do not block any ventilation openings Install in accordance with the manufacturer s instructions 8 Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 0i 9 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 provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet 10 Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus 11 Only use attachments accessories specified by the manufacturer 12 Use only with a cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid i2. be connected to one of the two 1 4 inputs by means of a shielded instrument cable The top 1 input jack is dB while the bottom 2 input jack is 15 dB This channel replicates the same circuitry as the classic 1966 B 15NF VOLUME TREBLE 11966 BIAS BIAS ON STANDBY 11964 BIAS BIAS OFF 10 11 7 8 9 10 VOLUME This controls the overall output level to the speaker outputs Use it wisely and turn it down when making connections TREBLE Use this to adjust the high frequency level of the amplifier This provides up to 18 dB of boost or 30 dB of cut at 5 kHz The high frequency output is flattest at the center position BASS Use this to adjust the low frequency level of the amplifier This provides up to 11 dB of boost or cut at 40 Hz The low frequency output is flattest at the center position ON STANDBY SWITCH Use this switch to activate the amplifier after the On Off switch 11 is turned on Always make sure the On Standby switch is in STANDBY mode when powering the Heritage B 15 ON or OFF 11 Allow at least 30 seconds before turning the On Standby switch to the ON position During short breaks this switch should be set to the Standby position to help prolong the life of the amplifier s tubes BIAS SWITCH With this switch users may now select between 1964 cathode bias or 1966 fixed bias 1964 or 1966 preamp or have the ability to mix and match ON OFF SWI
3. bus connection post volume controls Speaker Outputs 1 x 8 Q Heritage B 15 cabinet 2x4 Q One 4 Q cabinet or two 8 Q cabinets i e Heritage B 15 cabinet plus 8 Q extension cabinet Speaker Specs Custom designed 15 Eminence driver Die cast aluminum frame 109 ceramic magnet 4 Voice Coil Aluminum dust cover 400W power rating Made in the U S A Cabinet Construction Highest quality Baltic Birch solid Poplar and featuring dovetail box joint construction Size H x W x D with dolly 27 in 686 mm x 21 in 533 mm x 14 in 356 mm Weight with dolly 96 Ib 43 5 kg approximately 11 ME nma Heritage B15 Boss Amplifier Flip Top Instructions So you ve made it this far and you are now ready to flip your lid or at least the amp We will instruct you on how to do the latter as we are not in the business of lid flipping It is accomplished in five simple steps Step 1 loosen the latches on each side of the cabinet There are two latches on each side four total Step 2 using the handle lift the top of the cabinet amplifier is attached underneath and rotate it 180 Service Information Step 3 set the cabinet top handle side down on the top of the cabinet The amplifier should now be on the top Step 4 line up and lock all four latches Step 5 connect the amp to the cabinet Step 6 connect the power cable to a power source Step 7 connect the instrument to the amp Step 8 power
4. the Fleming Valve Then in 1907 Dr Lee de Forest added a third component the grid to Fleming s Valve and the vacuum tube was a fact of life The door to electronic amplification was now open During World War 1 data gleaned from their intensive research on the detectors used in radar systems led Bell Telephone Laboratories to the invention of the transistor This reliable little device gained quick support as the new component for amplification The death of the vacuum tube seemed imminent as designers scientists and engineers reveled in the idea of replacing large fragile glass tubes with these small solid state devices However there were and still are many serious listeners who realized that the sound produced by a transistor amplifier is significantly different from that produced by a tube amplifier with identical design specifications They considered the sound produced by these new solid state devices to be hard brittle and lifeless It was determined that solid state devices produced a less musical set of harmonics than tubes When pushed past their limits they tend to mute the tone and emphasize the distortion Tubes on the other hand produce a more musical set of harmonics the intensity of which may be controlled by the player This characteristic adds warmth and definition to the sound which has become the hallmark of tube amplifiers When tubes are driven into clipping the harmonic overtones can be both sweet
5. up the amp Step 9 the rest is up to you and the world is your oyster If you are having a problem with the Heritage B 15 please contact George Metropoulos by email at tech metroamp com or by phone at 810 614 3905 The Heritage B 15 is covered with sheet metal amplifier and a durable fabric backed vinyl material cabinet so be sure to clean with a dry lint free cloth Never spray cleaning agents on the Heritage B 15 Avoid abrasive cleansers which would damage the finish Ampeg continually develops new products and improves upon existing ones For this reason the specifications and information in this manual are subject to change without notice Ampeg is a registered trademark LOUD Technologies Inc All other brand names mentioned are trademarks or registered trademarks of their respective holders and are hereby acknowledged www ampeg com 2010 LOUD Technologies Inc 16220 Wood Red Road NE Woodinville WA 98072 Part No SW0874 Rev C 10 10 12
6. RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL ATTENTION POUR EVITER LES RISQUES DE CHOC ELECTRIQUE NE PAS ENLEVER LE COUVERCLE AUCUN ENTRETIEN DE PIECES INTERIEURES PAR L USAGER CONFIER L ENTRETIEN AU PERSONNEL QUALIFIE AVIS POUR EVITER LES RISQUES D INCENDIE OU D ELECTROCUTION N EXPOSEZ PAS CET ARTICLE A LA PLUIE OU A L HUMIDITE 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 product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons Le symbole clair avec point de fl che l int rieur d un triangle quilat ral est utilis pour l utilisateur de la pr sence l int rieur du coffret de voltage dangereux non isol d ampleur suffisante pour constituer un risque d l ctrocution The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and maintenance servicing instructions in the literature accompanying the appliance Le point d exclamation l int rieur d un triangle quilat ral est employ pour alerter les utilisateurs de la pr sence d instructions importantes pour le fonctionnement et l entretien service dans le livret d instruction accompagnant l appareil WARNING To reduce the risk of fir
7. TCH Use this switch to turn the overall system power on or off Always turn this switch ON first and OFF last Turn the On Standby switch 9 on at least 30 seconds after turning on the On Off switch 5 AForzgz ez ay __Htevitaye B 15 Boss Amplifier Heritage B 15 Rear Panel 5AR4 5046 66 66 6517 6517 6517 MAXIMUM POWER OUTPUT 30 WATTS RMS SPEAKER OUTPUTS 4 OHMS mco 4 OHMS 8 OHMS AWAY CONNECT SPEAKER AEFORE USE H T FUSE 5 chon foule uere e MODEL B 15 HAND BUILT IN THE USA POWER INPUT CONNECTOR This 15 SPEAKER OUTPUTS These 1 4 TS 14 is where you connect the supplied AC power cord The MAINS fuse is located inside the IEC socket fuse drawer and should be left alone unless a fuse has blown To remove and replace the fuse Disconnect the power cord from the IEC socket Remove the fuse drawer Remove the fuse and replace it with an equivalent type fuse T 3 15 AL 250 V H T FUSE The HIGH TENSION fuse is located inside the fuse holder cap and should be left alone unless a fuse has blown To remove and replace the fuse Disconnect the power cord from the IEC socket 12 Remove the fuse by turning the fuse holder cap counter clockwise Remove the fuse and replace it with an equivalent type fuse T 0 5 AL 250 V EXT This feature was originally designed as a means to daisy chain two or more B 15 amps together for additional pow
8. and or the amplifier See the section below titled The importance of proper biasing for more information on this subject We highly recommend replacing the driver tube s as well The driver tube determines the shape and amplitude of the signal applied to the power tube s and has to work almost as hard as the power tube s You may check the preamplifier tubes for microphonics by turning the amplifier on turning up the gain and tapping lightly on each tube with the end of a pencil or a chopstick You will be able to hear the tapping through the speakers which is normal It is not normal for a tube to ring like a bell after it is tapped If it does ring then it is microphonic and should be replaced Remember to use only high quality low microphonic tubes in the preamplifier section Even though power tubes are rarely microphonic they should be checked anyway The power tubes may be checked for microphonics just like the preamp tubes In the case of very high gain amps you may be able to reduce the amount of noise generated by simply swapping the preamp tubes around The importance of proper biasing For the best performance and longest tube life proper biasing is imperative Bias in fixed bias circuits such as the 1966 bias setting is the negative voltage which is applied to the power tube s control grid to set the level of idle current We cannot over emphasize the difference in warmth of tone and dynamic response that come with
9. and pleasing or intense and penetrating depending on the musician s taste and playing technique Over the years application engineers have designed a number of outstanding solid state amplifiers that sound very very good Some use special circuitry which enables them to simulate distortion characteristics of a tube amplifier However the tube amplifier still held in the highest esteem by many musicians offers a classic vintage sound in a contemporary market Tube types and usage The Ampeg Heritage B 15 contains three types of tubes preamplifier tubes power tubes and a rectifier tube Preamplifier tubes amplify the signal from the instrument and shape the sound They are inherently microphonic mechanically pick up and transmit external noises Since these tubes are used in the critical first stages of a tube amplifier s circuitry it is very important that any replacements are high quality low noise low microphonic tubes for this application Although tubes of this quality may be difficult to find and typically cost more than off the shelf tubes the improvement in performance is worth the investment The preamplifier tubes in the Ampeg Heritage B 15 are three 6517 N O S JAN Philips ECG 6188 These tubes use larger octal sockets and are physically larger than most typical preamp tubes 12AX7 12AT7 12AU7 ECC81 ECC82 ECC83 7025 The Ampeg Heritage team chose 6517 tubes for period authenticity as these tubes ca
10. e or electric shock do not expose this apparatus 10 rain or moisture ME nma Heritage B 15 Boss Amplifier NOTE 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 are 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 However 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 one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment the receiver Connect the equipment into outlet a circuit different from that to which the receiver is connected Consult the dealer an experienced radio TV technician for help CAUTION Changes or modifications to this device not expressly approved by LOUD Technologies Inc could void the user s authority to operate the equipment under FCC rules This apparatus does not exceed the Class A Class B whichever is applicable limi
11. el 1 1964 B 15NC Channel 2 1966 B 15NF Selectable bias modes for ultimate tone control 1964 cathode bias 25W 4 or 8 Q 1966 fixed bias 30W 0 4 or 8 0 e High grade new and 0 5 tubes e Preamp 3x 6517 0 5 JAN Philips ECG 6188 e Rectifier 1 x GZ34S Power amp 2 x 6L6GC e Legendary Baxandall bass treble tone stack on both channels e Dual inputs per channel 0 dB and 15 dB e Custom designed 15 US made Eminence driver 4 voice coil 109 oz ceramic magnet e Aluminum dust cover e External amplifier out e Removable dolly with casters e Dimensions H x W x D 27 x 21 x 14 w dolly e 96 Ib 43 5 kg w dolly Table of Contents Important Safety Instructions 2 Introduction Features 3 Heritage B 15 Front Panel 5 Heritage B 15 Rear Panel 6 Important Information About Tubes 7 Heritage B 15 Block Diagram 10 Heritage B 15 Specifications 11 Heritage B 15 Service Information 12 Introduction Hand built and hand wired in the U S the Ampeg Heritage B 15 delivers legendary tone in a design that truly lives up to the iconic standard set by inventor Jess Oliver 50 years ago The Heritage B 15 features circuit paths of both a 1964 and 1966 B 15 including classic Baxandall EQ controls and premium 6SL7 octal preamp tubes along with a bias switch recreating each years distinctive bias methodology The extremely high quality flip top cabinet featu
12. er This new and improved Heritage B 15 could also be used as a line out to feed an unbalanced input such as a direct box or a mixer Alternately it may be utilized as an input Any signal applied here will not be affected by the volume controls 2 6 output jacks supply speaker evel power to the speaker cabinet The rated power output is 30 watts rms into a 4 OQ or 8Q load The Heritage B 15 cabinet is rated at 8 Q When using a single Heritage B 15 cabinet with the Heritage B 15 head connect the cabinet to the matching 8 Q speaker output jack using a high quality speaker cable When using the Heritage B 15 cabinet with an additional 8 ext speaker connect the two 8 cabinets to two 4 Q jacks using two high quality speaker cables Two 8 Q cabinets in parallel equal 4 load When using the Heritage B 15 cabinet with one 4 Q cabinet such as a Heritage SVT 410HLF or SVT 810E connect the single 4 Q cabinet to the 4 speaker output jack using a high quality speaker cable Use speaker cables with 1 4 TS ends only to make the connections Do not use instrument cables as they may overheat ME nma Heritage B 15 Boss Amplifier Important information about tubes A brief history of the tube In 1883 Thomas Edison discovered that electrons would flow from a suspended filament when enclosed in an evacuated lamp Years later in 1905 John Ambrose Fleming expanded on Edison s discovery and created
13. hours Typical Example Level dBA Slow Duo in small club Subway Train Very loud classical music The boss screaming at his minions about manual deadlines Loudest parts at a rock concert Correct disposal of this product This symbol indicates that this product should not be disposed of with your household waste according to the WEEE directive 2002 96 EC and your national law This product should be handed over to an authorized col lection site for recycling waste electrical and electronic equipment EEE Improper handling of this type of waste could have a possible negative impact on the environment and human health due to potentially hazardous substances that are generally asso ciated with EEE At the same time your cooperation in the correct disposal of this product will contribute to the effective usage of natural resources For more information about where you can drop off your waste equipment for recycling please contact your local city office waste authority or your household waste disposal service ME nma Heritage 815 Boss Amplifier Features e Hand built in the U S A e Limited edition production Only 50 units available e Numbered and matched heads cabs e Classic Ampeg flip top design Chrome plated chassis e Rugged cabinets made with Baltic birch and poplar Legendary double baffle cabinet design delivers classic tone e Two distinct hand wired preamp circuits Chann
14. me standard with the 1964 Ampeg B 15NC and 1966 Ampeg B 15NF Nothing sounds closer to the real thing than the real thing and to ensure the best possible sound out of the Heritage Ampeg B 15 we sourced the N O S New Old Stock JAN Joint Army Navy Philips ECG 6188 that is a Super Military 6517 The 6SL7 preamplifier tube closest to the power tubes is used to drive the power tubes It is possible to change the sound of the amplifier by changing the type of preamp and or driver tubes When making any modification to your equipment it is highly recommended that you consult with a qualified service center O ME nma Heritage B 15 Bass Amplifier Tube types and usage continued Power tubes are the largest tubes used in an amplifier generate the most heat and wear out the fastest These tubes convert the low level conditioned signal from the preamplifier into a level that is sufficient to drive the speakers There are several types of power tubes available each of which offers a different performance sound characteristic The Ampeg Heritage B 15 uses two 6L6GC As with the preamp tube selection the 6L6GC was selected for period authenticity When replacing power tubes please replace them with a tested matched pair and have the amp rebiased by a qualified service center It is possible to change the sound of the amplifier by changing the type of power tubes When making any modification to your equipment it is highly recommended that you consult
15. njury from tip over 13 Unplug this apparatus during lightning storms or when unused for long periods of time 14 Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in 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 PORTABLE CART WARNING 15 Do not overload wall outlets and extension cords as this can result in a risk of fire or electric shock 16 This apparatus shall not be exposed to dripping or splashing and no object filled with liquids such as vases or beer glasses shall be placed on the apparatus 17 This apparatus has been designed with Class construction and must be connected to a mains socket outlet with a protective earthing connection the third grounding prong 18 The MAINS plug or an appliance coupler is used as the disconnect device so the disconnect device shall remain readily operable 19 For the terminals marked with symbol of 4 may be of sufficient magnitude to constitute a risk of electric shock The external wiring connected to the terminals requires installation by an instructed person or the used of ready made leads or cords RISK OF ELECTRIC SHOCK DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR 4 CAUTION AVIS CAUTION REDUCE THE
16. proper biasing If the bias is set too high overbiased the sound from the amp will be distorted at all levels If the bias is set too low underbiased the power tubes will run hot the plates inside the tubes may glow red due to excessive heat and the sound from the amplifier will lack power and punch The excessive heat greatly reduces tube life from a few days to as little as a few hours in extreme cases Setting the bias on the amp is like setting the idle on a car If it s too high or hot it s running away with you and if it s too low or cold it will choke when you step on it The factory bias is adjusted by George Metropoulos himself It is important to point out that tubes of the same type and specification typically exhibit different performance characteristics Consequently whenever power tubes are replaced the bias voltage must be checked and re adjusted to accommodate the operating parameters of the replacement tubes The bias adjustment should be performed only by qualified service personnel with the proper calibrated test equipment The bottom line Only 50 Ampeg Heritage B 15s were hand built with the intention of replicating the classic sounds of the 1964 and 1966 models In order to achieve this the combo comes standard with 3 6SL7 N O S JAN Philips ECG 6188 preamp tubes 1 5AR4 62345 rectifier tube 2 6L6GC power amp tubes As mentioned earlier replacing these tubes with different rated ones is possible but
17. res the legendary double baffle design and houses a highly researched custom designed 15 Eminence driver The Heritage B 15 is no mere tribute it meets and exceeds the performance look and tone of the legendary original down to each and every component In order to get the most out of the Heritage B 15 please read this manual before you begin playing And thank you for choosing Ampeg ME nma Heritage 815 Bass Amplifier eritage B 15 Front Panel VOLUME TREBLE ZN 2 e SZ SZ um 5 INPUTS 1964 1964 INPUT The signal output from instrument active or passive may be connected to one of the two 1 4 inputs by means of a shielded instrument cable The top 1 input jack is dB while the bottom 2 input jack is 15 dB This channel replicates the same circuitry as the classic 1964 B 15NC VOLUME This controls the overall output level to the speaker outputs Use it wisely and turn it down when making connections TREBLE Use this to adjust the high frequency level of the amplifier This provides up to 18 dB of boost or cut at 5 kHz The high frequency output is flattest at the center position BASS Use this to adjust the low frequency level of the amplifier This provides up to 10 dB of boost or cut at 40 Hz The low frequency output is flattest at the center position 1966 INPUT The signal output from an instrument active or passive may
18. sensitivity or feels as if it is working against you the preamplifier tubes may need to be replaced The power tubes are subjected to considerably more stress than the preamplifier tubes Consequently they almost always fail degrade first If deteriorating power tubes aren t replaced they will ultimately fail Depending on the failure mode they may even cause severe damage to the audio output transformer and or other components in the amplifier Replacing the tubes before they fail completely has the potential to save time money and other unwanted troubles Since power tubes work together in an amplifier it is crucial that they if there is more than one be replaced by a matched set If you are on the road a lot we recommend that you carry a spare matched set of replacement power tubes and their associated driver tubes After turning off the power and disconnecting the amplifier from the power source carefully check the tubes in bright light for cracks white spots inside the glass or any apparent damage Then with the power on view the tubes in a darkened room Look for the preamplifier tubes that do not glow at all or power tubes that glow excessively red ME nma Veritage B 15 Boss Amplifier The nature of tubes continued Whenever replacing power tube s Always have the amplifier s bias voltage checked by a qualified service center Improper bias voltage will cause degradation in performance and possibly damage tubes
19. the consequence is a completely different sound Proceed with caution Heritage 15 Bass Amplifier Heritage B 15 Block Diagram 5 13WI LOAM 3JnorT HMT 39T 22 2159 en OHU 1x3 909 YO vUUS 29919 29919 2159 2159 2759 agn rap at a 39U1Id03H 73004 031319395 5 SS3 Nn MZ T 389 540151530 779 SIS3HiN3 d NI NHOHS 39U1710n 9NILI3S SUIS amp 96T Q3183SNI 1UNSIS ON HiIM 9NIQU3M 390917100 7970 ZZO 2159 Z T TA 10 O Poza pz ez ay __Htevitayge B 15 Boss Amplifier HERITAGE B 15 TECHNICAL SPECIFICATIONS Preamp Tube 3 x 6517 0 5 JAN Philips ECG 6188 Power Amp Tube 2 x 6L6GC Rectifier Tube 1 x GZ34S or user optional 1 x 5046 Two channels 1964 channel is based upon the 1964 15 Preamp Circuit Two inputs Input 1 is 0 dB Input 2 is 15 dB EQ Baxandall Bass 10 dB 40 Hz Baxandall Treble 18 dB 5 kHz 1966 channel is based upon the 1966 15 Preamp Circuit Two inputs Input 1 is dB Input 2 is 15 dB EQ Baxandall Bass 11 dB 40 Hz Baxandall Treble 18 30 dB 5 kHz Power Tube Bias 1964 Cathode per 1964 era B 15NC 1966 Fixed per 1966 B 15NF Output Power Rating 8 or 4 Q 1964 Bias 25 watts rms 5 THD 1966 Bias 30 watts rms 5 THD Ext Amp 1 0 Bus 1 25 Vrms 4 dBu amplifier output clip unbalanced
20. ts for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian Department of Communications ATTENTION pr sent appareil num rique pas de bruits radio lectriques d passant las limites applicables aux appareils num riques de class A de class B selon le cas prescrites dans le r glement sur le brouillage radio lectrique dict par les ministere des communications du Canada Exposure to extremely high noise levels may cause permanent hearing loss Individuals vary considerably in susceptibility to noise induced hearing loss but nearly everyone will lose some hearing if exposed to sufficiently intense noise for a period of time The U S Government s Occupational Safety and Health Administration OSHA has specified the permissible noise level exposures shown in the following chart According to OSHA any exposure in excess of these permissible limits could result in some hearing loss To ensure against potentially dangerous exposure to high sound pressure levels it is recommended that all persons exposed to equipment capable of producing high sound pressure levels use hearing protectors while the equipment is in operation Ear plugs or protectors in the ear canals or over the ears must be worn when operating the equipment in order to prevent permanent hearing loss if exposure is in excess of the limits set forth here Duration Sound doy in
21. with a qualified service center Rectifier tubes convert the high voltage AC from the power transformer to a high voltage DC supply that powers all the other tubes Rectifier tubes give the amplifier much of the compression feel as maximum output power is approached This in turn is one of the keys to an amplifier s responsiveness to the musician The Ampeg Heritage B 15 uses a single 62345 for rectification to mimic the 1964 1966 era circuit It is also possible to use 5046 to get the vibe of a pre 1962 B 15N Like all of the other tubes these rectifier tubes were also chosen for period authenticity When making any modification to your equipment it is highly recommended that you consult with a qualified service center The nature of tubes why and when to replace them Tubes are made up of a number of fragile mechanical components that are vacuum sealed in a glass envelope or bubble The tube s longevity is based on a number of factors which include how hard and often the amplifier is played vibration from the speakers road travel repeated setup and tear down etc Any time you notice a change in the amplifier s performance check the tubes first If it s been awhile since the tubes were replaced and the sound from the amplifier lacks punch fades in and out loses highs or lows or produces unusual sounds the power tubes probably need to be replaced If the amplifier squeals makes noise loses gain starts to hum lacks
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