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75 / 2A6  Spice Model?
75 / 2A6  Spice Model?
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Old 1st January 2010, 11:41 PM   #1
coldcathode is offline coldcathode  United States
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Default 75 / 2A6 Spice Model?

Anyone have a 75 / 2A6 spice model?

Or
can someone help me "fit" Curve Captor to LTSPICE triode?
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Old 1st January 2010, 11:59 PM   #2
ja2dhc is offline ja2dhc  Japan
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The following is the tube model of 75 for TINA simulator.
I am not familiar with LTSPICE. I hear TINA's model can be
used for LTSPICE.

------------------------------------------------------------------
* Generic triode model: 75
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Sat Mar 8 22:41:46 2008
* Plate
* | Grid
* | | Cathode
* | | |
.SUBCKT 75 A G K
.PARAM X1=0.62861222 X2=0.0015984063 X3=-0.25776155
.PARAM X4=0.85335807 X5=91.742588 X6=1.7577615
.PARAM X7=0.00073974709 X8=107.50773 X9=0.00046981663
.PARAM Y1=0.00036987355 Y2=0.00038021882
BK IK 0 V=U(V(G,K)+X1)*X7*URAMP(V(G,K)+X1+URAMP(V(A,K))/X8)^1.5+(1-U(V(G,K)+X1))*X9*(X2*URAMP(V(A,K)))^X3*(X4*URAMP(V (G,K)+X1+URAMP(V(A,K))/X5))^X6
BA A K I=URAMP((Y2*URAMP(V(A,K))^1.5)-URAMP((Y2*URAMP(V(A,K))^1.5)-V(IK)+Y1*URAMP(V(G,K))^1.5*(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+.4)))+1E-10*V(A,K)
BG G K I=Y1*URAMP(V(G,K))^1.5*(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+.4)
* CAPS
CGA G A 1.7p
CGK G K 1.7p
CAK A K 3.8p
.ENDS
*
----------------------------------------------------------------------------
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Old 2nd January 2010, 01:29 AM   #3
coldcathode is offline coldcathode  United States
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Thank you,

I also found that 75 = 2A6 = 6SQ7 (except for Max plate voltages_

Will use 6SQ7 models.
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Old 2nd January 2010, 01:55 PM   #4
Robert McLean is offline Robert McLean  Canada
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Coldcathode :

Quote:
can someone help me "fit" Curve Captor to LTSPICE triode?
to get LTSpice code, after you build the model, go to the "Spice Code" tab, click on the button that says "Spice 3F4" by default. Then you will get a list of choices for what flavour or Spice you want. Select "LT SwitcherCad", and you will get the LTSpice code.
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Old 3rd January 2010, 10:05 AM   #5
revintage is offline revintage
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Quote:
The following is the tube model of 75 for TINA simulator.
I am not familiar with LTSPICE. I hear TINA's model can be
used for LTSPICE.
To make Ayumi´s work in LTspice just exchange all ^ with **
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Old 3rd January 2010, 06:20 PM   #6
coldcathode is offline coldcathode  United States
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revintage,

Thank you Very Much!

Ayumi,

Domo Arigato!


I was wondering if I could "adapt" the old RCA 7025 Phono preamp circuit to a set of 2A6's or 75's.

It looks like it might work?

Differential between 20hz and 20khz is about 39db and at 1K it is down 19.5db.
That looks to be right about the RIAA curve?
Attached Images
File Type: jpg 75 Phono Section.jpg (370.1 KB, 96 views)
File Type: jpg 75 Phono Schematic.jpg (159.3 KB, 95 views)
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