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9.3 Tube Change

Tube changes are only to be undertaken by authorized service
personnel. If power tubes with different values then the original

ones are to be installed, then the amplifier must be re-biased before
operation can be resumed. The amplifier uses a three circuit bias

system. It is quick and easy to accomplish biasing, but involves

removing the chassis and use of specialized equipment for
measuring currents inside the amplifier. Only trained professionals

should attempt this procedure.

Summary of Contents for Diezel

Page 1: ...Diezel User Manual for the Herbert Amplifier ...

Page 2: ...ter Three Peripheral Connections 3 1 Front Panel Connections 3 1 1 Signal In 3 1 2 Connection Information 3 1 3 Cable Selection 3 2 Rear Panel Connections 3 2 1 Send Return Loop 3 2 2 Parallel and Serial Return 3 2 3 Switch able Loop as additional Volume Control 3 2 4 Switch able Loop for external Pre Amp 3 2 5 Switch able Loop as switch for parallel Loop 3 2 6 Tuner Out 3 2 7 Compensated Out 3 2 ...

Page 3: ...3 Deep 5 2 Power Amplifier Tubes 5 2 1 Function 5 2 2 Selection 5 2 3 Life Span Chapter Six Functions and Switches 6 1 Programming Herbert 6 2 Manual Channel Selection 6 3 Mid Cut on off 6 4 Loop on off 6 5 Mute on off 6 6 Master 2 6 7 Store Chapter Seven Midi 7 1 MIDI 7 2 MIDI In 7 3 MIDI Thru 7 4 MIDI Communication 7 4 1 Omni Mode 7 4 2 Single Channel Mode automatic Channel Recognition 7 4 3 Sin...

Page 4: ...Chapter Eight Remote Switch Chapter Nine Maintenance and Cleaning 9 1 Cleaning 9 2 Care 9 3 Tube Change ...

Page 5: ...d specified for the amplifier Do not use 2 conductor extension cords or anything other than 3 pole g rounded outlets for this Appliance Your life may depend on it Please observe the following points when transporting your Herbert Herbert is a Tube Powered Amplifier therefore it is sensitive to shock especially after playing the amplifier for a while Please store and transport your amplifier gently...

Page 6: ...EPAIR WORK MUST BE DONE BY A DIEZEL CERTIFIED TECHNICIAN Not following this procedure will VOID WARRANTY This will ensure the the original owner and us at Diezel Amplification that the work is done correctly and that there is knowledge of what is going on out there with each amp To any second owners or more there is no warranty coverage nor is a warranty transferable This policy is no different th...

Page 7: ... will light up This starts the tube heating process After about 40 seconds the tubes have sufficiently heated for normal operation Your Herbert is now ready for operation and the standby switch can be turned to run also facing up Premature activation of the standby switch will lead to unnecessary tube stress and subsequent reduction of the power tube s life span 2 1 3 Power Tube Caution Tubes are ...

Page 8: ...e and better complexity in tone after playing the amp for a short while It s like warming up before running a marathon Get it 2 1 5 Power Tube Life The power tubes of your amplifier are subject to a certain aging process Once one of the tubes shows signs of aging unreliability or unusual noise then we suggest that you replace all power tubes Matched tube sets wear relatively even or so our experie...

Page 9: ...side the wire and shield What are we talking about OK A capacitor is used in electronic crossovers amongst other things to divide low and high frequencies Capacitance in a cable therefore cuts your guitar s high end to a certain degree Generally the longer of a cord you use the more of the cords inherent characteristics will be audible 3 1 3 Cable Selection In certain instances it is desirable to ...

Page 10: ...unit to the amplifiers level Most effects units have led bar or other level control devices The Output of the effects unit must be connected to one of the return jacks parallel switched or serial If you use the parallel return then the signal can be mixed to the original signal via the rear panel mounted Volume control 3 2 2 Parallel or Serial Which is better for you Read on There are 2 ways to ha...

Page 11: ... phasing problems resulting in unsatisfactory tone The signal portion that is unaffected by the mix control in the effects unit would reach the amplifier at a different time due to the cabling and cause phasing cancellations 3 2 3 Switch able Loop as additional Volume Control Those of you who can live without processors in the parallel loop can use this loop for a second master volume for each cha...

Page 12: ... leave this jack if you connect it to a mixer or recording device Use it to quietly compose or send an auxiliary signal to a console etc For quiet sessions just turn the master volumes to 0 Recording a loudspeaker through a microphone is the preferred choice of recording engineers The compensated out was designed as an alternative for those of you that don t have a studio at your fingertips 3 2 8 ...

Page 13: ...th of the power amp The output level should be matched to give the best possible sound with all 3 channels without over driving the power amp section Headroom adjustments of 10 are usually sufficient 3 3 MIDI Connections 3 3 1 MIDI In Midi in receives program change orders from commonly available midi pedals and control systems The Herbert is able to supply phantom power to your midi pedal via a 7...

Page 14: ...3 3 2 MIDI Thru This jack routes the midi signal to other midi partners MIDI data not addressed to the Herbert gets looped through this jack See chapter 7 for MIDI programming instructions ...

Page 15: ...set to 12 00 o clock and the master volume just slightly cracked open To avoid hearing damage 4 1 1 Channel One Clean Tone Clean Tone is a very sensitive subject because there are so many different ideas on how a clean amp should sound like Clean tonal textures require much higher dynamic range than distorted sounds From hard and percussive sounds to soft and warm blossoming tones Herbert was desi...

Page 16: ...y and Level Designed for friends of Heavy or Nu Metal type musical styles the Intensity control attenuates low midrange at approximately 400Hz To compensate for the inevitable volume loss when activating this feature one can bring the volume level back up with the Level Control This Mid Cut function is MIDI assignable and can therefore be assigned to any or all of the three channels If you don t w...

Page 17: ...l other tubes 12AX7 tubes come in many different gain stages and offer a wide variety of tonal behavior Our choice for production was made to ensure a wide variety of tones with low noise and hopefully excellent reliability 4 3 Microphonics and Bad Noises The overall performance of pre amp tubes is easily influenced by mechanical factors from the outside This would manifest itself by a sudden feed...

Page 18: ...n a low performance effects unit can be used and amplified in the loops 5 1 2 Presence This knob controls frequencies over 3KHz Treble is produced and dispersed in a very small beam from the speaker so be sure to position yourself in the projection area of the speaker when making adjustments 5 1 3 Deep The Deep control is an active bass control contrary to conventional bass controls It controls th...

Page 19: ... in sufficient quantities So it is possible that tube brand and tube type will change during production You can fine tune your Herbert by having different type and brands of tubes installed however it is imperative that the amp is biased properly Herbert utilizes 6 power tubes organized in 3 pairs with triple bias possibility This allows use of 3 different pairs of power tubes either the same or d...

Page 20: ...e tubes will obviously last longer Really We have heard tubes that are over 10 years old but it was not a good thing Tubes age in a very slow manner slow enough for the artist to get used to the changing tone To keep things fresh and to keep your tube dealer in business we recommend re tubing cleaning and biasing once a year if the amp is used frequently ...

Page 21: ...ample 01 then you can initiate this channel s switching via your MIDI pedal Push 01 on your MIDI pedal after programming and the pedal will send digital information to the amplifier The amp will read this information and decide whether or not it is supposed to respond When properly programmed it will then switch on channel one OK here it is again Select 01 on your MIDI pedal Select channel one of ...

Page 22: ...annels much like the Mid Cut function 6 7 Store As discussed earlier this is the universal programming button Activating this button twice will verify an intended program procedure In case you have pushed this button once by accident or if you have started to program and don t want to anymore for whatever reason then you can push any other switch any switch but the Store switch to cancel the progr...

Page 23: ...t to the midi in of other units to continue the MIDI chain 7 4 MIDI Communication 7 4 1 Omni Mode The Omni mode will allow reading of MIDI information on all 7 channels It is an easy way to get into the MIDI system but it is not advisable if more MIDI partners on different channels are in the same system Then a certain MIDI channel should be assigned to the Herbert and its program changes should b...

Page 24: ...d hold Mute and then turn on the preamp channels in the order that corresponds to your midi channel preference For example if you want to have your Herbert to respond only to MIDI information that is being sent on channel 7 then you must hold the Mute button down and turn the Preamp channel one selector off channel two selector on channel 3 selector on If you let go of Mute now then your Herbert i...

Page 25: ...the housing to clean the amp The inside of your amp carries dangerous voltages 9 2 Care Be gentle with this amplifier Any mechanical shocks and wide temperature changes moisture rich environments and extreme conditions dust wind heat cold moisture can substantially shorten tube life in some cases even amplifier life Do not block the air circulation grilles in the front and in the back of the amp D...

Page 26: ... are to be installed then the amplifier must be re biased before operation can be resumed The amplifier uses a three circuit bias system It is quick and easy to accomplish biasing but involves removing the chassis and use of specialized equipment for measuring currents inside the amplifier Only trained professionals should attempt this procedure ...

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