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This is a site mostly about valve (vacuum tube) amplifiers for guitar and the never ending search for tone and reducing hum and noise. While somewhat technical, it should be readable by most people who have had exposure to circuits and amplifiers in general.
This is a site mostly about valve (vacuum tube) amplifiers for guitar and the never ending search for tone and reducing hum and noise. While somewhat technical, it should be readable by most people who have had exposure to circuits and amplifiers in general.
Design Books:
Design Books:
Guitar Amplifier Design: Tubes and Semiconductors Play Together - A book about designing a novel 100 watt guitar amp and amps in general
New: The book design is updated to version 4.3 including SoloVerb3 reverb
Guitar Amplifier Design: Tubes and Semiconductors Play Together - A book about designing a novel 100 watt guitar amp and amps in general
New: The book design is updated to version 4.3 including SoloVerb3 reverb
Guitar Amplifier Overdrive - A visual explanation of over-driven tube circuit behaviors and "evolution of an OD stage"
Guitar Amplifier Overdrive - A visual explanation of over-driven tube circuit behaviors and "evolution of an OD stage"
Pickup Hum Cancelling:
Pickup Hum Cancelling:
Amp Circuits and Mods:
Amp Circuits and Mods:
Tuning DCCF Harmonics - An introduction to the operation and tone quality created by the ubiquitous Direct-Coupled Cathode Follower circuit.
Tuning DCCF Harmonics - An introduction to the operation and tone quality created by the ubiquitous Direct-Coupled Cathode Follower circuit.
Understanding the Long Tail Phase Inverter (LTPI) - A summary of how the LTPI circuit works in guitar amplifiers.
Understanding the Long Tail Phase Inverter (LTPI) - A summary of how the LTPI circuit works in guitar amplifiers.
Waveforms and Spectra - Examine the relationships between common waveshapes and their harmonic content.
Waveforms and Spectra - Examine the relationships between common waveshapes and their harmonic content.
Modify a classic (THD Univalve) - improve its tonal range and put this amp in a class of its own (with ModD demo clips)
Modify a classic (THD Univalve) - improve its tonal range and put this amp in a class of its own (with ModD demo clips)
Amp-Aid for Vintage Tube Amplifiers - Bias tremolo and reverb/FX/bias additions for the 5F6a Tweed Bassman. Analog spring reverb for the 5e3 Tweed Deluxe with sample clips.
Amp-Aid for Vintage Tube Amplifiers - Bias tremolo and reverb/FX/bias additions for the 5F6a Tweed Bassman. Analog spring reverb for the 5e3 Tweed Deluxe with sample clips.
Flexi-50 fix and Flexi-Verb - fixes for two nagging problems with the THD Flexi-50 and a dedicated spring reverb FX unit tailored specifically to the Flexi FX loop.
Flexi-50 fix and Flexi-Verb - fixes for two nagging problems with the THD Flexi-50 and a dedicated spring reverb FX unit tailored specifically to the Flexi FX loop.
Novel Amp Projects:
Novel Amp Projects:
Solo v5.4 - New 60w head weighs 8 Lbs. Two channels, dual OD sources, novel EQ, dual trem, and reverb.
Solo v5.4 - New 60w head weighs 8 Lbs. Two channels, dual OD sources, novel EQ, dual trem, and reverb.
Solo 100 v4.3 - Latest version of the GAD book amp with added user controls, spring reverb, in a maple cabinet.
Solo 100 v4.3 - Latest version of the GAD book amp with added user controls, spring reverb, in a maple cabinet.
V-45 Head - A versatile 45w head with a high gain preamp and four-triode OD stage. Version v1.6 based on GAD book design principles.
V-45 Head - A versatile 45w head with a high gain preamp and four-triode OD stage. Version v1.6 based on GAD book design principles.
BM lite project - An evolving project about a light-weight high-performance 5F6A chassis. New dual-channel 100w BML4 design.
BM lite project - An evolving project about a light-weight high-performance 5F6A chassis. New dual-channel 100w BML4 design.
Princeton-AOT - a light-weight Princeton-size combo amp with 40w - the Sugar Bee amp based on this AOT design is featured as "Editors' Pick" in Guitar Player magazine and "VG Approved" by Vintage Guitar magazine (see pics below).
Princeton-AOT - a light-weight Princeton-size combo amp with 40w - the Sugar Bee amp based on this AOT design is featured as "Editors' Pick" in Guitar Player magazine and "VG Approved" by Vintage Guitar magazine (see pics below).
Deluxe Plus - a cascode preamp in a classic AB763 Deluxe Reverb Amp. Version 2 and the search for 5e3 tone
Deluxe Plus - a cascode preamp in a classic AB763 Deluxe Reverb Amp. Version 2 and the search for 5e3 tone
Building a Bassman clone from a Weber 5F6a kit - build guidance, lessons learned, and features you may want to add
Building a Bassman clone from a Weber 5F6a kit - build guidance, lessons learned, and features you may want to add
Bassman Redux - a new variation on the 5F6a Tweed Bassman, adding a blend-able Grit channel and a Master Volume - now describing a fourth version of this project
Bassman Redux - a new variation on the 5F6a Tweed Bassman, adding a blend-able Grit channel and a Master Volume - now describing a fourth version of this project
Misc:
Misc:
email for comments or questions: uneumann at gmail dot com
email for comments or questions: uneumann at gmail dot com
Gallery:
Gallery:
Solo v5.4
Solo 100 v4.3
SugarBee
SugarBee
V45 v1.6
BML4 100w
Teluxe 25
BM Lite
Princeton-AOT
Deluxe Plus
Bassman Redux
Univalve w/mods
Valve Jr w/mods
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