Russian L3-3 tube tester - Page 16 - diyAudio
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Old 24th December 2012, 06:22 PM   #151
diyAudio Member
Join Date: Feb 2008
Hi guys, I got this wonderful tester just the other week.
My first impressions is that it is a cool piece of industrial design, and it seems to work well, but it's a little bit more work to use it than for example an Avo tester, due to the pin-card work and the constant pushing of the test button.

I was able to print some cards that I downloaded in .spl format off a russian webpage linked to in page 10, using the russian language spl application.

The manual I have is in German, I do speak some German, so I have been able to try the tester. However I have a couple of questions.
One is how do you safely change tubes? Do you have to pull out a number of pins, or is there a setting where it will "stand by" while you change tubes?

Second, does anyone have a test card for 1625?
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Old 24th December 2012, 06:44 PM   #152
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Location: Near Eindhoven, the sanctum of the pentode. and among that other things.
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it should not apply any voltages whilst the Test button is not engaged. whit the exception for perhaps the fillament.
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Old 28th January 2013, 09:43 PM   #153
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Join Date: Jan 2011
Hoping someone can help me to open up my tester.
I have a L1-3 tester which has been modified by replacing the large vaiable resistor by the L3-3 type at some time in the past. So far I have had no problems with it.
Earlier this evening, I was going through the preliminary checks prior to testing a valve I found that the -10V of VG1 does not work although the -65 is fine. I removed the tester from its case and with some difficulty, checked R91 the 4k7 pot. It looks OK.
Then I tried to open up the chassis to test R90, the 51K resistor & check the wiring. I removed the 2 screws on the panel but the chassis will only swing out a few mm. I didn't pull very hard to avoid breaking something. Is there anything else to disconnect?
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Old 2nd February 2013, 10:09 AM   #154
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Join Date: Jan 2009
Location: Wien
You'll have to unscrew all four screws in order to open the chassis, because the front panel is hinged. My L3-3 had a damaged -10v Ug1 potentiometer and I'd suggest that you inspect yours for burn marks on the track. hth
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Old 2nd February 2013, 03:38 PM   #155
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Join Date: Jan 2011
Thanks for the info, it has been a great help to me.
I found the top two screws easily, but couldn't find any more, I just didn't expect there to be any screws in the hinge area, so didn't look there.Your tip, made me look for them & it enabled me to open the tester up.
I didn't find what I expected. The 51k resistor measures 51K and the pot measures 5k1 and looks OK. There is a max of 18V available at the pot slider which is as expected which corresponds to around 30 on the meter with a pin in I/2.
I was following the instructions which said to check if the -10 pot could set Vg1 to 10 on the scale as a check for the -10V Vg1. (As I found out this corresponds to around 6V.) That is pretty near to zero on the scale & I thought it was a misprint & should have been set to 100 so the grid potential could be set accurately. It looks like my idea is wrong & that there is nothing wrong with my tester. I am relieved at that. On reflection, it may be a consequence of having a common scale with the
I think I have read the someone had replaced this pot with a 10-turn one to set the volts more accurately, is that a worthwhile mod with the existinf meter scale?
Many thanks
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Old 3rd February 2013, 03:50 PM   #156
cerker is offline cerker  Germany
diyAudio Member
Join Date: Jan 2012
Default Looking for Alpha/Beta testers ..


since I almost damaged my friends(alex5612) L3-3 last year by trying to create a test card myself (and doing it wrong) we decided that I should design a software which creates test cards from entered tube data. Now I'm looking for some people, who will help me by alpha/beta-testing the software.

AT FIRST A WARNING: The software is in very alpha state and there are almost definitely some serious bugs in it, which may even lead to damage of your tester. I strongly advise against using the created cards without a careful manual check.

It's released as open source (Although I don't recommend looking in the source right now, it's an unstructured, undocumented mess and I will clean it the next days). Just download the zip file right here:

Just extract the *.zip into a single folder, it should run. Maybe you will need the VS2010 C++ Redistributable (x86), which is available at Microsoft for free:

At the moment, it's in German language only. But I hope you will get around with it. internationalization is on of the next tasks to do.

If you have an sourceforge account, please use the ticket system for error reports.

Many thanks,

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Old 7th February 2013, 01:04 AM   #157
diyAudio Member
Join Date: Feb 2008
Hi Christian, I tried your app right now.
The save function didn't work, it just saved a blank image with nothing on it.
Printing worked fine!

I've not yet tried the card I made on it because I haven't evaluated it if it is safe to use yet
If you need help translating let me know.

This is a great effort!
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Old 7th February 2013, 06:13 AM   #158
cerker is offline cerker  Germany
diyAudio Member
Join Date: Jan 2012
Thanks for your report, I was able to reproduce that .. strangely it was working when I implemented it and I didn't touch the code since then. I will have a look at that for the next version.

I already have someone for English and Polish localizations, more languages are welcome. It's actually very easy to do, you just have to add translations for all marked texts via QtLinguist. At least the English version should be in the next alpha release.
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Old 7th February 2013, 07:17 PM   #159
cerker is offline cerker  Germany
diyAudio Member
Join Date: Jan 2012
Default New snapshot

A new alpha version will be released after internationalization.

But I found some serious mistakes in the socket configuration, which I tried to correct while revising the sockets completely and adding the "Adapterbox" from Arthur Rudolph (L1-3 Adapterbox) to the available options. The idea of choosing the right noval or octal socket automatically is rejected for now.

For this reason, I released an (almost untested (!!)) snapshot just now. If someone knows the L3-3 really good, he should test for correct socket connections.

Also I added a tube type "Anzeigeröhren" meaning indicator valves (magic eyes). Since the L3-3 doesn't support the "correct" circuit which uses the internal triode as an amplifier, its configured for driving the control electrodes of the viewing system directly using the G2 power supply. Do you like that feature?

The next step definitely will be translation
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Old 8th February 2013, 05:31 AM   #160
cerker is offline cerker  Germany
diyAudio Member
Join Date: Jan 2012
DON'T USE THE ADAPTERS YET. I read the description wrong and so the connections are totally screwed up!
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