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Knowledge Base

  1. HomeKnowledge Base

A number of well researched articles about the history and technical aspects of guitar gear and what’s really important for tone—all with zero marketing hype—just the facts. This is in-depth, esoteric stuff you will not find anywhere else online, in guitar magazines and especially Wikipedia!

Original-Mullard-ECC83

Mullard ECC83 (12AX7) Reissue vs Original – An Electrical Comparison

Vacuum Tubes and Transistors Compared

ww2-6SN7GTs

The 6SN7GT – the best general-purpose dual triode?

miniature-tube

The ’12AX7′ Tube

miniature-tube

The ’12AU7′ Tube

miniature-tube

The ’12AT7′ Tube

The Accurate BSPICE Tube Models

6bm8_2

The Cool Sound of Tubes

Evolution of the Tube

mullard_reissue_tubes2

Mullard ECC83 (12AX7) Reissue vs Original – A Physical Comparison

mullard_blackburn1_320px

Speed, Efficiency & Perfection – Aims That Have Built a Mammoth Factory in 16 Years

valve_microphony_mullard_fig_2_320px

Valve Microphony Part 1: Production of Microphony and Methods of Investigation

subminiature_tubes

Subminiature Tubes: The Future of Audio!

em81_tube

The ‘Magic Eye’

tube_diagram1

Signal Tubes

Tube Vendors

tube_chess2_320px

Tubes: The Old Verses the New

foil_those_tube_forgers_popular_electronics_jan1957_1

Foil Those Tube Forgers

broken_gear_tooth

Cryogenic Treatment of Tubes: An Engineer’s Perspective

The Inner Workings of Vacuum Tube Buffers

the_tube_family_tree_part_1_320px

The Tube Family Tree – Part 1

the_tube_family_tree_part_2_320px

The Tube Family Tree – Part 2

the_tube_family_tree_part_3_320px

The Tube Family Tree – Part 3

Black Plate Tube

Black Plate Tubes

testing_for_microhonics_in_tubes

Microphonics

Noise

chemical_highlights_tube_manufacturing_640px

Chemical Highlights of Tube Manufacturing

philips_green_blue_print_12at7_320px

That’s a Sylvania tube, the print is green, no, it’s blue

rca_12ax7_320px

The 12AX7 Tube – The Cornerstone Of Guitar Tone

Figure 22

Developments in Trustworthy-Valve Techniques

Oxide Cathode Life: Investigations into the Causes of Loss of Emission

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