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Old 22nd September 2012, 12:13 AM   #261
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Quote:
Originally Posted by jackinnj View Post
Tube tester has a "short" test which is the first test you should (always) perform!

I just got an Arduino Leonardo which is going to form the basis of a new, open source, tube and transistor tester.
Please tell us more, is it similar to Michael Koster's concept?

Jaz
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Old 22nd September 2012, 09:38 AM   #262
mogliaa is offline mogliaa  United Kingdom
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Thanks Alfredo, will look at this!
A quick example for 4P1L curves. Quite interesting tool indeed
http://www.bartola.co.uk/valves/wp-c...P1L-curves.png
Ale
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Old 22nd September 2012, 04:42 PM   #263
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Quote:
Originally Posted by jazbo8 View Post
Please tell us more, is it similar to Michael Koster's concept?

Jaz
No, not really. I have no issues with transformers.

The Leonardo behaves as if it were a USB device, i.e. no FTDI chip.

I published a tracer article about 10 years ago using the Basic Stamp -- it worked but was slow due to communication speeds. I've gotten a lot better at current sensing, stabilising power supplies etc.

The important thing for me is to be able to dump the data into Eurequa to come up with equations.
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Old 22nd September 2012, 04:57 PM   #264
mogliaa is offline mogliaa  United Kingdom
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How difficult is to work with Eureqa to produce the triode model?
I've been using Dmitry's paint tools with good results except for power transmitting DHTs..
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Old 23rd September 2012, 01:48 AM   #265
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Quote:
Originally Posted by mogliaa View Post
How difficult is to work with Eureqa to produce the triode model?
I've been using Dmitry's paint tools with good results except for power transmitting DHTs..
It's pretty straight forward with Eureqa, it take about 10-20 minutes to generate an usable solution. I never got the hang of using Model Curve Painter, the curves never lined up for me... So for triodes, my favorite is still Curve Captor - it's quick, accurate and does loadlines, Pd and THD calculations on-the-fly.

Jaz
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Old 24th September 2012, 02:44 AM   #266
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Quote:
Originally Posted by jackinnj View Post
Tube tester has a "short" test which is the first test you should (always) perform!
That's a good point... Besides having all the tube sockets pre-wired (a real time-saver), the tube tester also have select-able voltages for the plate and screen (although only up to 300V). Here is the tester I plan on using, if anyone has other suggestions, please let me know.

Click the image to open in full size.

which is a copy of this Russian unit.
Click the image to open in full size.

Thanks,
Jaz
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Old 26th September 2012, 11:05 PM   #267
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Default Curve Tracer as-built Schematics

Some people have been PM'ing asking for the circuit schematics. I finally got around to do it.
Attached Images
File Type: jpg curve tracer grid drive.jpg (520.8 KB, 513 views)
File Type: jpg Curve Tracer Power Supply.jpg (505.1 KB, 492 views)
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Old 1st October 2012, 01:31 AM   #268
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Quote:
Originally Posted by avincenty View Post
Ale, great job! See you have been busy tracing.

I built a camera hood that works great for me. It is made of 1/4 inch hard foam that is used for posters. The hood is light and strong and snaps tightly against the oscilloscope screen frame.
What settings are you using on the camera? I think you mentioned that you have a storage scope as well, right? BTW, thanks for posting the as-built schematic.

Jaz
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Old 1st October 2012, 02:05 AM   #269
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I don't recall the camera settings, since I am using the storage scope as well it is very easy, I only adjust the intensity on the scope until it takes a good picture. (usually very low intensity)

Alfredo
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Old 2nd October 2012, 04:47 AM   #270
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Originally Posted by mogliaa View Post
After a lot of work (more than I thought it was going to take), managed to bring the valve curve tracer to life.

Cheers,
Ale
Ale,

Sorry to bother you again... What are the front panel controls highlighted in the attached picture? I can't see them on your schematic.

Thanks,
Jaz

Click the image to open in full size.
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