842 Triode Spice

LT spice, Curve Captor, PSUDII and whatever other sims you can think of.

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jarek
Posts: 62
Joined: Wed Feb 02, 2005 10:02 am

842 Triode Spice

Post by jarek »

Hi all! I came across a very interestingly looking triode
from the 800-family: 842
*Moderate Ra @ 2.5k
*12W dissipation (or more if someone wants steroid KR tube version)

..anyone has a Spice model? The usual suspect Stephie ;)?

Thanks!
-j
sbench
Posts: 296
Joined: Fri Jan 28, 2005 3:45 pm

Post by sbench »

As I get an opportunity, I'll create a model and update the files... probably a few days. Unless, of course, someone wants to use that build model I posted and submit the resulting parms. :wink:

Stephie <3
sbench
Posts: 296
Joined: Fri Jan 28, 2005 3:45 pm

Post by sbench »

Adding 842 to the Triode drop down list. Enjoy,
Stephie <3
jarek
Posts: 62
Joined: Wed Feb 02, 2005 10:02 am

Post by jarek »

Heey Stephie! Thank you very much!
Unfortunately trying to simulate I get a "Timestep too small"
error. Never had it with other models.
Wondering why...

PS Apparently the trouble is indicated with 6E5P tube, which so far has been working 100% ok with other models from triode_nh (801A, 2A3, 300B)
jarek
Posts: 62
Joined: Wed Feb 02, 2005 10:02 am

Post by jarek »

OK, it has started to work. No idea what was wrong, but it works now :-)
Thanks again Stephie!
sbench
Posts: 296
Joined: Fri Jan 28, 2005 3:45 pm

Post by sbench »

I find that when I do some very complex simulations, the matrix math seems to get complex enough internally to cause those kind of problems. It gets particularly frustrating when you're using LT built in op amps and whatnot.

Sometimes using GEAR analysis will relieve the problem. Also, try the .noopiter Spice directive.

I usually try all the devices once I've added them to make sure I didn't mess up somewhere when I entered the data.

At some point (yeah, my bucket list just keeps getting longer) I intend to take the models to a new level. With the current "simple" tube models, there are a lot of compromises as you simply can't model the "edges" very well. I feel that LTs built in BV and BI behavioural sources ought to be able to help, since they are really powerful.

Stephie <3
jarek
Posts: 62
Joined: Wed Feb 02, 2005 10:02 am

Post by jarek »

Stephie, I've realized the tube was in some strange operating point as I entered it in the design. Once I've corrected the OP, it has started to work ok :)
lukaku1
Posts: 3
Joined: Mon Nov 10, 2014 1:02 am

Post by lukaku1 »

I usually try all the devices once I've added them to make sure I didn't mess up somewhere when I entered the data.
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