Hi, Thanks!
The text fits perfectly! The schematic is in the PDF-file, fourth file named "Elesta EZ10A-B Tester.pdf". /Martin On Sunday, 9 February 2014 23:44:08 UTC+1, I wrote: > > P.S. very nice restoration job. Where is the schematic that you say is > posted. I do NOT see it. Thanks, Ira. > > > > On 2/9/2014 2:25 PM, Dekatron42 wrote: > > Hi All, > > > > Today I finished restoring my EZ10/A/B tester that I bought a while ago. > > > > It is a small and nice box that makes it possible to test how the > > EZ10/A/B under real working conditions. The tester is built around a > > very simple circuit (two circúits in fact, one for EZ10 & EZ10A and > > one for EZ10B incorporated into one circuit) the circuit for the EZ10B > > and power supply can be found in the "Elesta technische mitteilungen > > Die dekadenzählröhre EZ10B nr 17 februar 1961", and the circuit for > > the EZ10A can be found in the book "Elektronische zählschaltungen" by > > Konstantin Apel and in the Elesta EZ10/A datasheets. > > > > The tester consists of a power supply that can be adjusted so that the > > working conditions are calibrated, a driving stage which is controlled > > by a push button, a switch which selects either EZ10 & EZ10A or EZ10B > > and an Anode current potentiometer that sets the operating point. All > > of these parts come straight out of the Elesta information except that > > the power supply has been modified to only use one high power wire > > wound potentiometer for setting the voltage used for the guide bias > > and driving stage. This then results in that the anode voltage for the > > EZ10 is just added on top of this voltage by the second winding and > > not regulated at all, so it gets a bit higher than the 580V in Elesta > > information. > > > > After having tested all of the components I decided to replace almost > > all of them, the tester was moldy and had a foul smell to it when I > > got it so it had not been stored well over the years, this had > > affected all of the resistors and capacitors badly as well as the > > outer tape layer of the transformer. Some resistors were more than 40% > > out of tolerance and a few capacitors were either working better as > > high ohms resistors and some were 600% out of tolerance! After having > > replaced them it worked like designed. > > > > To test an EZ10/A/B you turn the Anode current control to the left > > stop, select the type of EZ10 you want to test with the EZ10/A | EZ10B > > switch, then set the Calibrate/Test switch in the Calibrate position > > and turn on the power. Now you adjust the voltage control so that the > > needle hits the red dot at 1.6mA. Then you can put your EZ10/A/B in > > the socket and switch to the Test position and adjust the Anode > > current control to the test currents: 1.1mA, 1.3mA or 1.6mA for the > > EZ10/A or 1.3mA, 1.6mA or 1.8mA for the EZ10B and the push the Key > > switch so that the glow is chased around the tube twice - just as it > > says at the end of the label taped to the front panel! > > > > There is really nothing magical about this tester but the information > > on how the EZ10/A/B's were tested is very nice to have and also the > > pin straightener on the front is very good to have. > > > > I've tested a bunch of my EZ10A/B's now and found two flaky EZ10B's, > > one turned out to have a loose pin that got stuck in the test socket! > > No wonder that one didn't count properly! > > > > I've included a few photos and also the schematic plus the text at the > > front if anyone wants to have a go at the missing pieces where the > > label has been torn. I think that the first word might be either > > "Keep" or "Use" and the last word "pin" but I haven't been able to > > figure out more even though I have been trying to push the torn pieces > > around. > > > > /Martin > > > > -- > > You received this message because you are subscribed to the Google > > Groups "neonixie-l" group. > > To unsubscribe from this group and stop receiving emails from it, send > > an email to [email protected] <javascript:>. > > To post to this group, send an email to > > [email protected]<javascript:>. > > > To view this discussion on the web, visit > > > https://groups.google.com/d/msgid/neonixie-l/3addb724-47b5-42a9-9cb4-6a31ec6adae9%40googlegroups.com. > > > > For more options, visit https://groups.google.com/groups/opt_out. > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/07f24fd9-567c-40a8-89f1-79f385fd4815%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
