In this Technical Information Section you may explore the links, references, and technical documentation on various aspects of Vacuum Tube Amplifier Design as it relates to the work at Williams Vintage Amps.

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The Technical information is partitioned similar to the Mods section purposefully, to provide background information regarding the various aspects of the circuit designs behind the mods. An informed customer is better able to make decisions and properly frame their expectations regarding mod'ing their amp.

There is much very informative information available on the internet today regarding Tube Amplification circuits, so I will not try to revise what is already good, rather, you will find much of this linked herein for your convenience, with annotated notes where appropriate.

 

 

 

 

 

 

 

 

 

 

Keep Checking Back as I continue to update information as I accumulate together the mass of information that I utilize and refer to, and as time permits to evolve this site.

Gain Stages are the Heart of the Amplifier, for these are what accomplish the Amplification. As with anything, there are both basic patterns which are standards, and a variety of sometimes interesting variations.

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Since the simple gain stages comprise most of the circuitry in the amplifier they obviously affect the overall character of the sound of the amp. It is not only the number of stages, but how they are connected, and how they are designed that makes the largest differences between most amplifiers.

 

 

 

 

 

 

 

 

 

 

 

Tone Controls were originally added to amplifiers to compensate for shortcomings in the instruments or speakers, with the ideal amplifier being a flat response. No longer. Tone Control systems, or tone stacks as they are often referred to, can make up a large component of the tonal differences between amplifiers.

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It is not just the design of the tone stack that makes the difference, but the placement of the tone stack within the gains stage lineup as well.

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference Links

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Transformers:

Wiring Diagrams for Marshal Transformers at the Hoffman Amps Library

Wiring Diagrams for Fender Transformers at the Hoffman Amps Library

 

Tubes:

Frank Philipse's Tube Datasheets — Massive Database, well organized, multi-page format.

Roy J. Tellason's Tube Datasheets — Large Database, well organized, single-page format.

Jeff Duntemann's Compactron Tube List — Compactron Database, links, history.