46 triode-strapped DHT spice model - diyAudio
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Old 20th April 2012, 07:19 PM   #1
mogliaa is offline mogliaa  United Kingdom
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Default 46 triode-strapped DHT spice model

Hi everyone,
For the 46 fans, here is my attempt to model the triode-strapped curves. I traced one 46 RCA NOS on my curve tracer, and used Dmitry's tool Model Paint Tools: Trace Tube Parameters over Plate Curves, Interactivelyto generate the SPICE model.

Can anyone familiarised with the 46 provide some feedback on the model?
Electrode capacitances used were the ones of 45, as couldn't find the ones from 46...

Curves don't match really well at low currents, but also had to correct the camera lens distortion with Photoshop . All in all it seems reasonably to me...

thanks
Ale

-----------------------------------------------------------------

** 46-TRIODE DHT ************************************************** **********
* Created on Fri Apr 20 18:14:46 BST 2012 using tube.model.finder.PaintKIT
* model URL: www.bartola.co.uk
*--------------------------------------------------
.SUBCKT TRIODE_46-TRIODE 1 2 3 ; P G K ;
+ PARAMS: CCG=4P CGP=7P CCP=3P RGI=2000
+ MU=5.5020 EX=1.652 KG1=6720.0 KP=26.25 KVB=7.5 VCT=1.4080 ; Vp_MAX=250.0 Ip_MAX=0.08 Vg_step=5.0
*--------------------------------------------------
E1 7 0 VALUE={V(1,3)/KP*LOG(1+EXP(KP*(1/MU+(VCT+V(2,3))/SQRT(KVB+V(1,3)*V(1,3)))))}
RE1 7 0 1G
G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1}
RCP 1 3 1G ; TO AVOID FLOATING NODES
C1 2 3 {CCG} ; CATHODE-GRID
C2 2 1 {CGP} ; GRID=PLATE
C3 1 3 {CCP} ; CATHODE-PLATE
D3 5 3 DX ; FOR GRID CURRENT
R1 2 5 {RGI} ; FOR GRID CURRENT
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS
*$
Attached Images
File Type: jpg 46 DHT spice.JPG (42.5 KB, 202 views)
File Type: jpg Picture 3.jpg (69.8 KB, 192 views)
File Type: jpg 46small.jpg (197.4 KB, 190 views)
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http://www.bartola.co.uk/valves/
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Old 17th May 2012, 08:17 PM   #2
mogliaa is offline mogliaa  United Kingdom
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Dmitry kindly improved the model and got a very accurate representation of the triode-strapped 46!


More details can be found here: Bartola Valves | All about electronic valves and hi-fi

cheers
Ale
Attached Images
File Type: jpg 46_try1jpg.jpg (171.1 KB, 143 views)
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