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Old 8th April 2013, 02:21 PM   #1
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Default Micro-Cap Tubes Parameters question

I have Micro-Cap 9. It has a 6DJ8 tube in it. I'd like to change the parameters to a different tube, which isn't in it's database (6H30).

Those are the parameters for 6DJ8:

+PARAMS: LIP= 1.5 LIF= 10 RAF= 0.09 RAS= 0.2 CDO= 0
+ RAP= 0 ERP= 1.35
+ MU0= 33 MUR= 0.02 EMC= 0.0000795
+ GCO=-0.2 GCF= 0
+ CGA=1.40E-12 CGK=3.30E-12 CAK=1.80E-12

Out of those, I get what MU0, CGA, CGK and CAK are.
I have no clue what the other parameters mean.

Does anyone here know?
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Old 17th April 2013, 07:16 AM   #2
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Anyone?
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Old 17th April 2013, 03:03 PM   #3
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You need to consult a tube manual so that you can compare and contrast different tubes. I use this site: electron Tube Data sheets.
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Old 17th April 2013, 03:35 PM   #4
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Thank you.
I wrote my initial post after looking at the tube manual.
As should be obvious from what I wrote above, I found in the tube manual the equivalent for MU0, CGA, CGK and CAK - so I know what they mean.
I didn't find in the tube manual any equivalent for the values of Micro-Cap for LIP, LIF, RAS, CDO, RAP, ERP, EMC, GCO and GCF - so I have no clue as of what they mean and how to alter them for a different tube.
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Old 17th April 2013, 04:25 PM   #5
kevinkr is offline kevinkr  United States
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They are spice parameters.
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Old 17th April 2013, 04:36 PM   #6
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Thank you.
Is there a known way to alter them for a different tube?
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Old 17th April 2013, 04:36 PM   #7
GoatGuy is offline GoatGuy  United States
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They are SPICE parameters (repeating KevinKR).

However, the much better question (or point) really is: got a diagram? If you post it here, you might get people like me who will figure out how to substitute in the alternate tube.

Maybe that's not what you want though.

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Old 17th April 2013, 04:39 PM   #8
kevinkr is offline kevinkr  United States
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He wants to modify the parameters to those of other tube types. Best way to do this is to get the spice models and manually edit the params based on what is in the model you want to use.

Truthfully LTSpice IV does a much better job, is free and has no limitations on number of nodes or parts in a circuit being simulated. Lots of tube models all over the web for LTSpice as well.
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Old 17th April 2013, 07:06 PM   #9
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Open tube.lib in MicroCap or a text editor and add this subckt to the library file.

.subckt 6H30 P G K
Gp P K VALUE=
+ {(0.3800825583m)*limit(V(P,K)*ln(1.0+(-0.02540430176)+exp((7.018331616)+
+ (7.018331616)*((15.85848193)+(-66.34009258m)*V(G,K))*V(G,K)/sqrt((27.2125877)**2+
+ (V(P,K)-(5.267363515))**2)))/(7.018331616),0,1e16)**(1.211856956)}

Cgk 6.3p
Cpk 2.4p
Cgp 6.0p

.ends 6H30

Save tube.lib. Now in MicroCap open the component editor. Windows ->Component Editor.
In the component editor on the right is the component tree.

Expand Tubes->Triode->then to whatever branch/group you would like to put the 6H30, like in my screenie below.

To add a group, click add group. To add your tube in a preexisting group, click add component.

Place 6H30 in 'name'. Use the drop down menus to select Shape->Triode, Definition->subckt.

Left click on each pin to set the node names/labels as in the screenie. Be sure that the dots are positioned at the end of each terminal.

Adjust the green XX YY positions to your liking. This is the text, part number/name (X1/6H30) that appears when you place the part on the schematic.

Close the component editor. When save changes dialog appears, choose yes.

That's it.
Attached Images
File Type: png 6H30.png (18.0 KB, 58 views)
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Old 17th April 2013, 07:09 PM   #10
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To select a group left click on it to highlight first before adding.
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