POWERTONE - USER MANUAL
Contents
1. KT88 KT90 KT100 Also the POWERTONE is provided with two seperate bias control trimmers on the PC board one for the inner two power tubes and one for the outer two power tubes thus enabling the use of mixed sets of power tubes two two So for example the two outer tubes may be EL34 s while the two inner tubes are 6L6 s or 6550 s Each type of power tube has its own distinctive sound character therefore changing to a different type or mix of types of power tubes also changes your amp s overall sound REPLACING TUBES e SAFETY FIRST DISCONNECT THE POWER CORD FROM ITS POWER SOURCE AND LET HOT TUBES COOL e CHECK THE TUBE LOCATION DIAGRAM ON THE CHASSIS FOR THE CORRECT TYPE NUMBERS AND LOCATIONS e REPLACE TUBES ONLY WITH ORIGINAL KOCH HIGH QUALITY TUBES IF OTHER TUBES ARE USED THE WARRANTEE OBLIGATION EXPIRES e BEFORE REPLACING THE POWER TUBES REMOVE THE CE SAFETY CAP FIRST e AFTER REPLACING THE POWER TUBES PUT THE CE SAFETY CAP BACK IN PLACE NOTE ALWAYS HAVE THE AMP REBIASED AFTER PEPLACING THE POWER TUBES BIASING INSTRUCTIONS CAN BE FOUND INSIDE THE AMP REBIASING THE AMP IS NOT NECCESSARY ONLY IF KOCH POWER TUBES ARE USED WITH THE SAME TYPE AND BIAS CLASS NUMBER Preamp and Power tubes wear out and have to be changed from time to time to maintain the amps best performance Tubes behave like strings they loose highs lows and dynamics and after a period of time they have to be changed Exactly2. ULTRA GAIN TRASH RHYTHM CtEAN CHANNEL TREBLE VOLUME CLEAN CHANNEL TREBLE VOLUME CLEAN CHANNEL TREBLE VOLUME CLEAN CHANNEL TREBLE VOLUME CLEAN CHANNEL TREBLE VOLUME VOLUME VOLUME VOLUME VOLUME VOLUME ULTRA GAIN ULTRA GAIN ULTRA GAIN ULTRA GAIN ULTRA GAIN VOLUME VOLUME VOLUME VOLUME VOLUME PRESENCE PRESENCE PRESENCE PRESENCE PRESENCE TREBLE TREBLE LS DAMPING RH VOLUME REV FX MIX LS DAMPING RH VOLUME REV FX MIX LS DAMPING al RH VOLUME REVI FX MIX LS DAMPING RH VOLUME REV FX MIX LS DAMPING RH VOLUME REV FX MIX CONNECTION DIAGRAM TS412 16 ohm TS412 4 ohm TS412 16 ohm TS412 16 ohm Volts AC 115 230 CAUTION 50 60 Hz Watts 125 260 Channels i J wan C WW l N Clean r F E l N MIND ea y aene Footswitch a ap Speaker Outputs Recording L mono R L mono R OUTPUTS OUTPUTS EFFECTS UNIT EFFECTS UNIT TECHNICAL SPECIFICATIONS INPUT IMPEDANCES Input HIGH Input LOW From FX OUTPUT IMPEDANCES To FX SIGNAL LEVELS Effect Loops TUBES Preamp Power amp OUTPUT POWER MAINS 230VAC 50Hz 115VAC 60Hz 1M ohms 136 K ohms 100 K ohms 1K ohms 10 dBV 2x 12AX7A ECC83 1x 12AX7WA 7025 1x 12AX7A ECC83 EL34 6L6 6550 see text 120 Watts in 4 8 and 16 ohms 250 Watts 250 Watts Clean Channel Gain Channel Damping Standby Power O Powertone 1 2 3 4 5 6 7 8 9 10 11
3. when is hard to say but this is an indication if you play almost every day change tubes each year if you play once or twice a week change tubes every 2 3 years Tubes rarely fail If they are bad these might be the symptoms PREAMP TUBES ECC83 12AX7A 7025 12AX7WA Microphonic whistling or squealing on one or both channels No or low amp volume on one or both channels Excessive noise on one or both channels POWER TUBES Loud crackling that is not affected by front panel controls Intermittent or regular blowing fuses Weird amp distorting Hum Changing a tube is a simple and quick fix for most problems in your amp In case of failure just one or more POWER TUBES can be replaced without rebiasing only if KOCH tubes with the SAME TYPE AND BIAS CLASS NUMBER are used If power tubes with a different or unknown bias class number are used for replacement BOTH TUBES the two inner or the two outer tubes have to be replaced and the amp has to be REBIASED Please always use four or two two see above matched replacement power tubes to obtain the amps best performance SAMPLE SETTINGS CLEAN ULTRA CLEAN GAIN COMPRESSED CLEAN 1 ULTRA GAIN COMPRESSED CLEAN 2 CLEAN FULL RHYTHM GAIN ULTRA GAIN CLEAN OPEN CHORDS GAIN HARD ROCK RHYTHM ULTRA GAIN HARD ROCK LEAD CLEAN OPEN CHORDS GAIN METAL RHYTHM ULTRA GAIN METAL LEAD CLEAN BLUES JAZZ GAIN TRASH LEAD
4. 12 1314 Volts AC 115 230 CAUTION 50 60 Hz Watts 125 250 Channels Parallel Serial Output Power 120 Watts l i CONNECT SPEAKERS BEFORE USE 11 Ultra Gain EJ Gain oe IB ja 168 7 oooo Joooooo AT 220 240V 1 4 3 16 Footswitch Effect Loops Speaker Outputs Recording 1 2 3 4 5 6 7 8 9 Fuse 100 120v 3 15 6 3
5. ITCH Selects the Clean the Gain and the Ultra Gain channel if the Footswitch is not connected 3 FOOTSWITCH CONNECTOR Provides an input for the FOOTSWITCH and automatically disconnects the Channels Switch 2 THE FS 5 FOOTSWITCH The Footswitch included is equipped with five switches three CHANNEL switches for selecting the Clean channel the Gain channel or the Ultra Gain channel red LED indicators a SOLO RHYTHM switch for activating green LED on or bypassing the RHYTHM VOLUME control 11 a REV FX switch for switching the Parallel Effects Loop on off yellow LED Thus functioning as a Reverb on off switch or if an effects unit is plugged in to this loop as an Effects on off switch 5 4 PARALLEL EFFECTS LOOP SEND TO FX This jack provides a buffered mono output from the preamp and can be used in conjunction with the RETURN FROM FX 5 jack as a patch point for external effects units see CONNECTION DIAGRAM page 5 PARALLEL EFFECTS LOOP RETURN FROM FX This jack disconnects the internal spring reverb and inputs external effects signal via the REV FX MIX control at the front panel directly to the power amp where it is mixed with the original dry signal from the preamp IF THIS LOOP IS USED DIRECT SIGNAL MUST BE TAKEN OFF THE EFFECTS UNITS SIGNAL FOR EXAMPLE WITH ITS DRY WET MIX CONTROL 6 SERIAL EFFECTS LOOP SEND TO FX This jack provides a buffered mono output from the preamp and can be us
6. POWERTONE USER MANUAL FRONT PANEL FUNCTIONS 1 INPUTS HIGH Input for standard level instruments e g guitars with passive pickups LOW Input for high level instruments e g guitars with high output passive or active pickups Both inputs may be used for connecting two instruments simultaneously 2 BASS MID 8 TREBLE Classic passive tone controls that regulate low mid and high frequencies respectively of the Clean channel 3 VOLUME Controls the volume level of the Clean channel 4 GAIN This Dual Gain is a very powerful feature combining Drive and Gain Boost in one knob This has been achieved by controling the amount of amplification in the Post EQ Overdrive channel preamp in two stages simultaneously Cleaner sound is achieved at lower settings 3 to 5 at middle settings 5 to 10 medium overdrive occurs which will produce more sustain and distortion At high settings 15 30 mega overdrive occurs adding a lot of of sustain and compression Accurate pre and post shaping circuitry prevent the low end from getting muddy even at the highest settings 5 VOLUME Controls the volume level of the Gain channel 6 ULTRA GAIN This channel has an additional fifth gain stage and therefore delivers extra sustain and compression Distorted sound is achieved at lower settings 3 to 6 at higher settings 6 to 15 heavy overdrive occurs which will produce a more powerfull distortion At high settings 15 30 ultr
7. a overdrive occurs adding tons of power sustain and compression 7 VOLUME Controls the volume level of the Ultra Gain channel NOTE High gain settings may cause squealing and or excessive hum and noise due to microphonic guitar pick ups and insufficient screening of circuitry 8 PRESENCE Controls the amount of boost in the upper mid frequency range of the Gain Ultra Gain channel 9 BASS MID amp TREBLE Classic post distortion passive tone controls that regulate low mid and high frequencies respectively of the Gain Ultra Gain channel In this channel the tone control circuit is located behind the overdrive stage therefore equalising the overdrive tone which results in better control over the harmonics at high gain settings and a powerfull overdrive sound 10 RHYTHM VOLUME When activated see Footswitch this control functions as a master volume and can be preset at a lower rhythm volume NOTE If the Footswitch is not connected the RHM VOLUME is active 11 REV FX MIX CONTROL Controls the amount of the Spring Reverb or Effects signal see rear panel 5 mixed with the original dry signal 13 DAMPING SWITCH Switches speaker damping from High to Low In High normal position the power amp damps the speaker which results in a more controlled sound In Low position the power amp s damping of the speaker s cone movement is minimal which results in a more open sound 13 STANDBY SWITCH Allows the amp
8. ed in conjunction with the RETURN FROM FX 7 jack as a patch point for external effects units see CONNECTION DIAGRAM page 7 SERIAL EFFECTS LOOP RETURN FROM FX This jack inputs external direct effects signal directly to the power amp and automaticallv disconnects the preamp NOTE The EFFECT LOOPS operate on a 10dBV SIGNAL LEVEL which guarantees compatibility with both instrument level effects like floor pedals and guitar processors as well as line level effects like professional 19 inch rack mount devices NOTE If the connecting of an effects unit to the POWERTONE causes hum a ground loop may be the reason for it This ground loop may be eliminated by isolating or disconnecting the effects units earth from the mains sockets earth 8 SPEAKER OUTPUT JACKS Provided for connection of speaker s or speaker cabinet s with a minimum total impedance of 4 8 or 16 ohms 9 RECORDING OUTPUT This jack provides a mono output from the power amp and includes Reverb and External Effects signals The signal is derived from the speaker output and filtered bv a special Speaker Simulating Filter which simulates the sound coming from the speaker Now the signal can be fed directiv to a recording or sound reinforcement mixer while the amp will sound as if it is miked POWER TUBE OPTIONS Due to special bias control circuitry the POWERTONE is able to accept almost any type of power tube for example EL34 6CA7 6L6 6550 KT66 KT77
9. to be placed in standby or active mode In standby mode the tubes remain hot but the amplifier is not operational 14 POWER SWITCH Turns AC power On and Off When the switch is Off the amplifier is completely shut down When switching the amplifier On allow the tubes to get hot before switching to the active mode 13 POWERTONE USER MANUAL REAR PANEL FUNCTIONS 1 A C POWER INPUT Power cord input The amp is equipped with a worldwide power supply It is possible to rewire for selecting one of two voltages 115 or 230 inside the amp Either of these voltages will work worldwide with minor power differences The amp will work on either 50 or 60 hertz After rewiring MAKE SURE FUSES ARE REPLACED WITH PRINTED RATINGS ON REAR OF AMP FUSE Both fuse and spare fuse are located within the cap of the fuseholder Fuse sled can be removed with a screwdriver If the fuse should fail IT MUST BE REPLACED WITH THE SAME TYPE AND VALUE IN ORDER TO AVOID DAMAGE TO THE AMP AND TO PREVENT VOIDING THE WARRANTY If the amp repeatedly blows fuses check for a bad power tube If tube failure is not the cause the amp should be taken to a qualified service center for repair WARNING ONLY A QUALIFIED TECHNICIAN SHOULD ATTEMPT AN INPUT VOLTAGE CHANGE PERSONEL INJURY OR EQUIPMENT DAMAGE MAY OCCUR IF DONE INCORRECTLY WARNING THE FUSE SHOULD ONLY BE REPLACED WHEN THE POWER CORD HAS BEEN DISCONNECTED FROM ITS POWER SOURCE 2 CHANNELS SW
Download Pdf Manuals
Related Search