Search found 15 matches

by Ray
Mon Apr 20, 2015 8:03 pm
Forum: Sim City
Topic: IEC Tape Source Model
Replies: 0
Views: 9258

IEC Tape Source Model

With the help of others, I've been able to create LTspice Laplace models for both RIAA phono and NAB tape sources, which I use to evaluate RIAA and NAB playback circuits. But I haven't figured out how to model an IEC tape source. The difference between NAB and IEC, as I understand it, is that the NA...
by Ray
Wed Apr 09, 2014 4:31 am
Forum: Phono
Topic: One of Arthurs early schematics.
Replies: 2
Views: 7444

Arthur Loesch's design is alive and well here:

http://www.tempoelectric.com/phono.htm
by Ray
Tue Mar 18, 2014 5:48 pm
Forum: Sim City
Topic: LTspice - simulation error
Replies: 1
Views: 8218

If you would post your schematic and the SPICE models you are trying to use someone might be able to help. Having said that, it's important to make sure that the symbols you use in your LTspice schematic match the device models you have. From your description, here is what I think is going on. First...
by Ray
Fri Jun 14, 2013 8:43 pm
Forum: Sim City
Topic: Help needed with tube simulation by LTSpice
Replies: 2
Views: 7321

There are a few things that I recommend you change in this circuit. First, the tube has about 0 volts grid-to-cathode bias, owing to a signal source with a 2 volt DC offset. In a Class A circuit you always want the grid to be negative with respect to the cathode; if not, you will get significant out...
by Ray
Tue Mar 19, 2013 4:39 am
Forum: Sim City
Topic: Drop Down Menus for selecting your tube
Replies: 28
Views: 62173

You really don't have to go through the steps in section 2 of Stephie's original email because the resulting files are contained in the tubestuff.zip file. Unzip the files in that archive and copy them into the suggested folders. Then you will be able to add the drop-down symbol to your schematic (l...
by Ray
Wed Jan 09, 2013 4:47 pm
Forum: Sim City
Topic: how to translate spice model to ltspice standard?
Replies: 4
Views: 12077

Make sure that the name you give to the MOSFET in your schematic matches the subcircuit definition exactly (except for upper/lower case, which isn't important). In your subcircuit file, this would be ZVN0545G (the G is part of the name). It looks like you have left the device name as NMOS, which is ...
by Ray
Mon Jan 07, 2013 4:28 pm
Forum: Sim City
Topic: how to translate spice model to ltspice standard?
Replies: 4
Views: 12077

The devices in the standard.mos file are defined by the MODEL directive, whereas your ZVN0545G model is a SUBCKT (subcircuit). So you can't easily add this model to the standard.mos file. Instead, here is what I recommend you do. Save the Zetex ZVN0545G model to a file named ZVN0545G.inc. Put this f...
by Ray
Wed Nov 21, 2012 8:43 pm
Forum: Sim City
Topic: SPICE Models for the 7199 Pentode-Triode
Replies: 13
Views: 20116

Stephie, I'm simulating the stock Dynaco ST-70 in stages and ran into some warnings and errors when using the 6CA7_EL34 model in the tetrode.txt library. I've attached the LTspice schematic for the output stage only, along with the log file from a transient simulation. (The warning about the single ...
by Ray
Tue Nov 20, 2012 8:38 pm
Forum: Sim City
Topic: SPICE Models for the 7199 Pentode-Triode
Replies: 13
Views: 20116

Stephie,

I've been playing with the 7199 model and it is giving reasonable looking results. Thanks again for sharing your models.

Ray
by Ray
Sat Nov 17, 2012 8:31 pm
Forum: Sim City
Topic: SPICE Models for the 7199 Pentode-Triode
Replies: 13
Views: 20116

Thanks, Stephie. My original ST-70 schematic had an incorrect B+ supply but the corrected version I posted shortly thereafter seems to produce reasonable results with your new model. The plate currents for the pentode and triode sections look about right, based on analysis of the original power supp...
by Ray
Wed Nov 07, 2012 8:29 pm
Forum: Sim City
Topic: SPICE Models for the 7199 Pentode-Triode
Replies: 13
Views: 20116

Sounds great, Stephie. I'll be interested in finally modeling the original Dynaco ST-70 with its 7199 tube, something I haven't been able to do with the Koren models.

Your hard work on these libraries is really appreciated!

Ray
by Ray
Tue Oct 16, 2012 8:00 pm
Forum: Sim City
Topic: Drop Down Menus for selecting your tube
Replies: 28
Views: 62173

Thanks, Stephie.
by Ray
Mon Oct 15, 2012 9:33 pm
Forum: Sim City
Topic: SPICE Models for the 7199 Pentode-Triode
Replies: 13
Views: 20116

Super -- thanks!
by Ray
Mon Oct 15, 2012 7:03 pm
Forum: Sim City
Topic: SPICE Models for the 7199 Pentode-Triode
Replies: 13
Views: 20116

Thanks for the quick reply, Stephie. At least I now understand why that model (particularly for the pentode) doesn't produce a useable result.

If you can get to the 7199 models at some point, that would be great.

Thanks again for all you've done.

Ray
by Ray
Sun Oct 14, 2012 5:56 pm
Forum: Sim City
Topic: SPICE Models for the 7199 Pentode-Triode
Replies: 13
Views: 20116

SPICE Models for the 7199 Pentode-Triode

For Stephie: I am a newcomer to this forum and would like to say "thanks" for all the work you have put into making SPICE models available to the rest of us. One model that I miss is the 7199 pentode-triode used in the Dynaco amplifiers. I've simulated the ST-70 driver circuit in LTspice u...