Welcome to viva Analog

Vacuum Tube Ckts /// Guitar-Bass Effects /// DIY pages

Analog Circuit Design and Modeling

JC Maillet (c) 1996 - 2008

R.I.P. Gar Gillies & Ken Fischer


Thermionic Tech

Bias Modulating Tremolo Circuits for Vacuum Tube Amps (11/19/03)

Elliminating Hum in Tube Amps (4/13/04)

Garnet Amplifier Variable-Bias Mod (*new* 2008)


Appreciation Pages

Garnet Tube Amps

Traynor Tube Amps

** Traynor Amplifier Schematics & Mods Archive **

Fender Tube Amps

Marshall Tube Amps


Selected Tube Projects

'72 Deluxe Restoration/Conversion ('05)

Concert Rig for Ken Hamm ('05)

Traynor mkIII /// Tweed-Reverberization ('04)

Hot-Rodded Fender Combos ('01-'03)

Mesa-Boogie S.O.B. /// Marshall MkII Mod ('01)

JCM900 - Silicon Removal ('97 & '98)

1960 Bassman Restoration

TSL-122 Repair/Mods

'72 Fire Breathing Champ


"Inside Fender and Marshall Tube Amps"

ISBN 0-9684849-0-5

(c) March 2002

Basic research in Vacuum Tube technology // Amp Mods and Tweaks


\\\ Mathematical Explorations ///

A Generalized Algebraic Approach

to Modeling Vacuum Tube Triodes

(1a) Original Glass Audio article - issue 2/98; Pspice Modeling Technique for Vacuum Tube Triodes

Permission to post kindly given by Mr. Ed Dell www.audioxpress.com

(1b) Retyped Glass Audio articlePspice Modeling Technique for Vacuum Tube Triodes ('98)

(2) MATLAB & Pspice Sourcefiles used in this work

(3) My Triode Reference Data RCA 12ax7 // RCA 12at7

(4) Pspice Rectifier Models : 5Y3GT, 5V4GA, 5U4GA, and 5AR4

(ref) Measurement of Nonlinear Transfer Moeller, Gromowski, Zoelzer 2002

(5) Opto-coupler Modeling (*NEW 10/08*) Silonex NSL32-SR3 Static Spice Model


~(: \\\ Rainbow of Sounds /// :)~

DIY Analog Effects

Triggered Swell *original design* foot activated auto-volume with dual mode effect loop ... Nyquist Aliaser *original design* Nyquist under sampler ... Stereo-Vibe 480 *original design* Don Bonham's Stereo "Maggie 480" bulb based emulator using Mieda class-A circuits ... Stereo-Vibe 45 *original design* light coupled op-amp signal path with original tri-mode super wide range constant amplitude LFO ... Range Mistress *original design* full spectrum RangerMaster type booster ... Unicord "Univibe" Phase Shifter - extensive Mods and Re-Design ... "Harmonic Multiplier" *original design* 4-quadrant multiplier based Squaring "Octaver" circuit with variable linear Mixer for Tube Harmonic Simulations and unique Octavia type sound ... Super "Full-Wave" Octaver *not original at all really* very close approx. to f(x)=|x|) ... SWR Limiter pedal *original mods* adapted for low supply including two-band active sidechain filtering ... "MutronIII" Filter/Follower, Pro version with extensive Mods ... Ranger "ParaExciter MkIII" Filter/Overdriver ... "MXR DynaComp" - Tired Battery Simulator ... EH "Small-Stone" Phase Shifter - The "Original" Univibe cap ratios Mod ... PAIA "Infinity+" sustainer circuit re-design ... 4-transistor Pitch-Only Theremin with Line-Out mod ... MXR "Phase45" - Univibing Filters, LED speed Indicator, Vibrato/Phasing mods ... Dan Armstrong "Green Ringer" - Nulling mod ... and MORE ...

Photo: Harry Primate - Missaussaugua Ontario


/// viva Analog /// 360+ /// Bass Preamplifier/Fuzz


\\\ Super Vintage - Mammoth Ivory ///

Organic Tone for Acoustic Guitars


Frank Zappa

Kim Mitchell

Lowell George

TOMMY BOLIN (Guitar Player Interview - March '77) link

Tommy Bolin's Gear


Amerindian Prophecy Stories - a Talk given by Lee Brown in Alaska (*1986*)

DogonStarMystery, BearMedicine, Newton

Helicopter dropping aid attacked by tribesmen

Joey Ramone's "Wonderful World" Lyrics and Chords

Make Music - Not War


jc -> lynx.net

Copyright JC Maillet (C)1996-2007