User Manual for the Diezel Herbert Amplifier
Table of Contents
Chapter One: Safety and Warranty
1.1Safety Warnings
1.2Warranty Information
Chapter Two: Using Your Herbert
2.1 Mains Connections, Power and Standby
2.1.1Mains/connect to power outlet
2.1.2Power up, Warm up, Standby off
2.1.3Power tube caution
2.1.4Operating Temperature
2.1.5Power Tube Information
Chapter Three: Peripheral Connections
3.1Front Panel Connections 3.1.1 Signal In
3.1.2 Connection Information 3.1.3 Cable Selection
3.2Rear 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 3.2.8 Speaker Connections
3.2.9 Reasons for Dynamic Losses in the Effects Loop
3.3MIDI Connections
3.3.1MIDI In
3.3.2MIDI Thru
Chapter Four: The Three Pre-Amplifiers
4.1Pre-Amplifier Duties 4.1.1 Channel One 4.1.2 Channel Two 4.1.3 Channel Three
4.2Pre-Amplifier Tubes
4.3Noise and Microphonics
Chapter Five: Power Amplifier
5.1Tone and Volume of the Power Amplifier 5.1.1 Master Volume
5.1.2 Presence 5.1.3 Deep
5.2Power Amplifier Tubes
5.2.1Function
5.2.2Selection
5.2.3Life Span
Chapter Six: Functions and Switches
6.1Programming Herbert
6.2Manual Channel Selection
6.3Mid Cut on/off
6.4Loop on/off
6.5Mute on/off
6.6Master 2
6.7Store
Chapter Seven: Midi
7.1MIDI
7.2MIDI In
7.3MIDI Thru
7.4MIDI Communication 7.4.1 Omni Mode
7.4.2 Single Channel Mode – automatic Channel Recognition 7.4.3 Single Channel Mode – manual Channel selection
7.5Program Information
7.6Phantom Power
Chapter Eight: Remote Switch
Chapter Nine: Maintenance and Cleaning
9.1Cleaning
9.2Care
9.3Tube Change
Chapter One: Safety and Warranty
1.1 Safety Warnings
We would like to stress the importance of the following points, for reasons of your personal safety, product longevity and product liability.
Do not use the amplifier in or near wet locations Do not store the amplifier in damp or wet locations
Do not operate the Amplifier on voltages other than those designated on the rear panel of the amplifier.
Do not open the panels of the amplifier. No user serviceable parts inside.
Your Herbert operates on very high internal voltages, which may still be present after the Amplifier has been turned off and disconnected for a while.
Do not use the Amplifier for anything other than its design purpose: To Amplify Electric Guitar Signals!
Do not use fuses other than those intended and 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, and try and avoid temperature extremes in storage, which might cause condensation resulting in moisture on internal components. Usually a 60 Minute acclimatization period is sufficient to ensure safe operation.
The Amplifier should be stored in a controlled environment, and it should be transported in a suitable flight case. Make sure the Amplifier gets transported in its normal operating position, not upside down or on its side.
The Herbert’s Design incorporates a very potent power amplifier. It is configured to deliver satisfying guitar tone at most volume levels, from a small bedroom to a large arena. In its normal operational volume level (75-80dB) it will provide beautiful tones with very little coloration. For reasons of your own personal health, please do not run the amplifier above these levels for extended periods of time without wearing hearing protection. Hearing Loss is a long -term problem, and is normally not curable.
1.2 Warranty
5 years to the original owner with proof of purchase. Power Tubes and Pre Amp tubes are covered for 3 months to the original owner. The amps will be tracked via both Diezel USA and Diezel Germany recorded sales beginning 1/20/2009. ALL REPAIR 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 then before). Of course we at Diezel are happy to serve people who purchase their amplifier on the used market should your amp ever need servicing. Parts and labor charges will occur for our work on your amplifier as usual.
If you purchased your amp before 1/20/2009 you are categorized under the same guidelines as when you purchased your amp (Lifetime warranty for the original owner, 1 year transferrable warranty).
Chapter Two: Using Your Herbert
2.1 Mains Connections, Power and Standby 2.1.1 Mains/Connection to Power Outlet
Please make sure that both switches (Power and Standby) are in the off position before connecting to the Mains circuit. Verify line voltage before connecting the power cord. Never start Herbert without speakers being connected to the proper terminals. (See 3.2.8)
2.1.2 Power up, Warm up, Standby off
First turn the Power switch to on (facing up). The indicator 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 electronic components that only function with vacuum intact and under very high operating temperatures. Each tube has one or more heating filaments, much like a light bulb. These filaments heat up the Anode of the tube. If you switch the standby switch before these Anodes have reached their operating temperature then the Anode surfaces are not heated evenly yet; the “operating temperature” of the tube is not reached yet. This causes undue stress on the tubes and their related components inside the amp. One should therefore always give the amp it’s much needed warm-up time, even if musical inspiration hits with full force.
2.1.4 Operating Temperature
It will take a little more time after warm-up until everything inside the amp is working in sync and to it’s fullest potential. A trained ear will notice a slightly warmer tone 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 experience suggests. This means if one goes, the others are not far from meeting the same fate.
The aging process manifests itself by a depletion of a thin layer of Wolfram on the Anodes. This can take anywhere from 6 month to 3 years, depending on the amount of use of the amplifier. The amount of wear is determined by the amount of performance that is asked from the tube.
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