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Vacuum Tube SPICE Models
Vacuum Tube SPICE Models
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Old 21st October 2013, 07:44 AM   #41
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
Could you please post the 6550A Spice model? I could not get Ayumi's version to work properly. So in the above graph, are the SOAs set to intercept with the load lines (instead of the datasheet 42W spec)? Also, for Class A, the operating conditions are different, so another graph is needed.
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Old 21st October 2013, 01:15 PM   #42
jackinnj is offline jackinnj  United States
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I redrew the chart and changed the operating anode voltages to those shown in the data sheet. in the previous example i had an error and was using 3400R -- should have been 4000R and the slope was too high.

EDIT -- the chart above uses the data from the PDF, not those approximated with SPICE.

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Amplification Factor 8.603 MU
kp 34.89 kp
Exponent 1.543 EX
Knee 11.947 KVB
Perveance 1995.1 KG

The parameters will change depending upon the limits you attach to the variables and the type of error you minimize.

Last edited by jackinnj; 21st October 2013 at 01:20 PM.
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Old 21st October 2013, 02:01 PM   #43
jazbo8 is offline jazbo8
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Thanks for the Koren parameters for the 6550A. Also, so it appears that it is still not possible to get the knees to line up on the 6V6 even with Robert's code, a real tough cookie...
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Old 21st October 2013, 02:31 PM   #44
jackinnj is offline jackinnj  United States
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Which of the data-sheets has the UL curves for the 6V6? It's not on GE or Tungsol.

BTW, it would appear that you can do any of the ZL curves with a transformer -- just change Zs from the nominal 8 ohms. The biggest I have is a 25W from Edcor -- as the UTracer pulses the anode and plate voltages, perhaps it will stand up to the demands.
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Old 21st October 2013, 03:19 PM   #45
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I can not find any UL curve for the 6V6, other than those plotted with the SPICE models. You mean the UL curve could be traced by varying the output load using a conventional (non-UL) transformer?
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Old 21st October 2013, 03:31 PM   #46
jackinnj is offline jackinnj  United States
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Quote:
Originally Posted by jazbo8 View Post
I can not find any UL curve for the 6V6, other than those plotted with the SPICE models. You mean the UL curve could be traced by varying the output load using a conventional (non-UL) transformer?
If the transformer were center-tapped you could change the Screen UL factor to 50%.

I'm still working through this.
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Old 21st October 2013, 05:24 PM   #47
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This reminds me of the thread smoking-amp did here.
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Old 21st October 2013, 07:10 PM   #48
jackinnj is offline jackinnj  United States
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I have 2 6V6's but they both test "weak" -- their pentode curves don't remotely match those of the datasheet. Not much point trying to derive UL Params with them.
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Old 22nd October 2013, 12:09 PM   #49
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As close as it gets, here is an UL characteristic for the Russian 6P6S:

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Old 22nd October 2013, 02:28 PM   #50
jackinnj is offline jackinnj  United States
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Params: MU=11.19 KP=37.5 EX=1.5 KVB=8.0 KG1=3430
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