sales@effectrode.com

  • About Us
  • Knowledge Base
    • Tubes
    • Binson Echorec
    • History
    • Pedals
    • Quality
    • Techie Tone
  • News
  • Press
  • FAQ
  • Vacancies
  • My Account
  • Login
logo
  • Store
  • Stockists
  • Artists
  • Contact
  • | Newsletter
  • Store
    • Accessories
    • Pedals
    • Vacuum Tubes
  • Knowledge Base
  • Stockists
  • Artists
  • Contact
  • FAQ
  • About
  • News
  • Press
  • Newsletter
  • 0

    Shopping cart

    0
    Cart is Empty

The Accurate BSPICE Tube Models

  1. HomeKnowledge BaseThe Accurate BSPICE Tube Models

The Accurate BSPICE Tube Models

“These equations for tube characteristics are phenomenological equations, that is, equations that model the behaviour of physical phenomena using a reasonable number of parameters, but are not derived from fundamental physics.” – Norman Koren

Koren then goes on to explain that the models are based on the following
two expressions:

E1=(Vpk/Kp)*Log(1+exp(Kp((1/m)+Vgk/(sqrt(Kvb+Vpk^2)))
Ip=((E1^Ex)/Kg1)*(1+sgn(E1))

Sign function prevents current flow when E1 < 0
(many models do not account for this).

Shown below are Berkeley SPICE models for the 12AT7 & 12AX7.

If you wish to use them then copy & paste them into your component models
in Electronics Workbench 'Multisim'.

.SUBCKT 12AT7; a g k h hct
* MU=60 EX=1.35 KG1=460 KP=300 KVB=300 RGI=2000
* CCG=2.3P CGP=2.2P CCP=1.0P ; ADD .7PF TO ADJACENT PINS; .5 TO OTHERS.
B0 7 0 V=V(a,k)/300*LOG(1+EXP(300*(1/60+V(g,k)/SQRT(300+V(a,k)^2))))
RE1 7 0 1G
B1 a k I=((V(7,0)^1.35)/460)*(1+SGN(V(7,0)))
RCP a k 1G ; TO AVOID FLOATING NODES IN MU-FOLLOWER
C1 g k 2.3P ; CATHODE-GRID; WAS 1.6P
C2 g a 2.2P ; GRID-PLATE; WAS 1.5P
C3 a k 1.0P ; CATHODE-PLATE; WAS 0.5P
D3 5 k DX ; FOR GRID CURRENT
R1 g 5 2000 ; FOR GRID CURRENT
Rh h hct 40 ; HEATER RESISTANCE
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS

.SUBCKT 12AX7; a g k h hct
* MU=100 EX=1.4 KG1=1060 KP=600 KVB=300 RGI=2000
* CCG=2.3P CGP=2.4P CCP=.9P ; ADD .7PF TO ADJACENT PINS; .5 TO OTHERS.
B0 7 0 V=V(a,k)/600*LOG(1+EXP(600*(1/100+V(g,k)/SQRT(300+V(a,k)^2))))
RE1 7 0 1G
B1 a k I=((V(7,0)^1.4)/1060)*(1+SGN(V(7,0)))
RCP a k 1G ; TO AVOID FLOATING NODES IN MU-FOLLOWER
C1 g k 2.3P ; CATHODE-GRID
C2 g a 2.4P ; GRID=PLATE
C3 a k 0.9P ; CATHODE-PLATE
D3 5 k DX ; FOR GRID CURRENT
R1 g 5 2000 ; FOR GRID CURRENT
Rh h hct 40 ; HEATER RESISTANCE
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS

In This Section

  • Black Plate Tubes
  • Chemical Highlights of Tube Manufacturing
  • Cryogenic Treatment of Tubes: An Engineer’s Perspective
  • Developments in Trustworthy-Valve Techniques
  • Evolution of the Tube
  • Foil Those Tube Forgers
  • Microphonics
  • Mullard ECC83 (12AX7) Reissue vs Original – A Physical Comparison
  • Mullard ECC83 (12AX7) Reissue vs Original – An Electrical Comparison
  • Noise
  • Signal Tubes
  • Speed, Efficiency & Perfection – Aims That Have Built a Mammoth Factory in 16 Years
  • Steampunk Technology: The Inner Workings of Vacuum Tube Buffers
  • Subminiature Tubes: The Future of Audio!
  • That’s a Sylvania tube, the print is green, no, it’s blue
  • The ‘Magic Eye’
  • The ’12AT7′ Tube
  • The ’12AU7′ Tube
  • The ’12AX7′ Tube
  • The 12AX7 Tube – The Cornerstone Of Guitar Tone
  • The 6SN7GT – the best general-purpose dual triode?
  • The Accurate BSPICE Tube Models
  • The Cool Sound of Tubes
  • The Tube Family Tree – Part 1
  • The Tube Family Tree – Part 2
  • The Tube Family Tree – Part 3
  • Tube Vendors
  • Tubes: The Old Verses the New
  • Vacuum Tubes and Transistors Compared
  • Valve Microphony Part 1: Production of Microphony and Methods of Investigation
logo
+44 (0) 1782 372210 sales@effectrode.com
facebook instagram twitter pinterest rss soundcloud
Newsletter

Useful Links

  • Shipping Policy
  • Refund Policy
  • WEEE Policy
  • Privacy Policy
  • Warranty Policy
  • Register Your Pedal

Instagram

The Phaseomatic Deluxe™ is unique phaser pedal t The Phaseomatic Deluxe™ is unique phaser pedal that utilises vacuum tubes and photocells to create rich, lush vibrato and swirling phase-chorused effects with amazing presence and clarity.
 
#effectrode #phaseomatic #phaser #phaserpedal #pedaloftheday #tubeeffects #guitarpedals #guitarfx #effectspedals #guitar #pedalboard #guitareffects  #guitargear #guitarist #knowyourtone #guitarpedal #stompbox #guitarplayer #geartalk #fxpedals #guitars #electricguitar #pedalboards #guitare #guitarra #chitarra
These two audio tools do essentially the same job These two audio tools do essentially the same job—compress (level out the dynamics) your guitar signal using class-A vacuum tube electronics and photocells. However, the Leveling Amplifier has a few extra bells and whistles up it's sleeves. It was primarily designed following requests from sound engineers and musicians for a four knob version of our PC-2A photo-optical tube compressor to include 'attack' and 'knee' knobs. We took this on board but, being engineers, we also added several other really cool features including balanced transformer isolated output, gain pad, tube boost, dynamic equaliser and parallel tube input stage (4 triode tube gain stages in parallel) for hyper-quiet operation.#effectrode #PC-2A #compressor #compressorpedal #levelingamplifier #tubeeffects #guitarpedals #guitarfx #effectspedals #guitar #pedalboard #guitareffects  #guitargear #guitarist #knowyourtone #guitarpedal #stompbox #guitarplayer #geartalk #fxpedals #guitars #electricguitar #pedalboards #guitare #guitarra #chitarra
The Best of 2020!   #effectrode #tubevibe #blackb The Best of 2020!
 
#effectrode #tubevibe #blackbirdpreamp #tubedrive #levelingamp #phaseomatic #deltatrem #compressor #pc2a #overdrive #univibe #phaser #tremolo #guitar #guitarpedals #guitarfx #effectspedals #guitareffects  #guitargear #guitarist #guitarpedal #guitarplayer #geartalk #fxpedals #guitars #electricguitar #pedalboards #guitare #guitarra #chitarra
© 2020 EFFECTRODE THERMIONIC