kriegsfunker Posted January 8, 2019 Author Share Posted January 8, 2019 When I put the multimeter on the wires, it shows open line, no matter how i do it. Link to comment Share on other sites More sharing options...
val Posted January 8, 2019 Share Posted January 8, 2019 Maybe the picture is deceptive but i see the thin wires come out from resistor porcelain itself. I have seen two types of similar resistors: - flexible wires come out from resistor and they are connected to clamp, which just holding the resistor - flat rigid lead come out from resistor, they are connected to clamps which just holding the resistor This is in case of fixed value resistor. Adjustable use clamp, then the resistor wire is visible and clamp is pressed against the wire. You should remove the resistor from capacitor, remove the clamps and give the wire a good cleaning. I see a lot of corrosion there. Link to comment Share on other sites More sharing options...
tornfuté Posted January 8, 2019 Share Posted January 8, 2019 the sister of Na8 the SGLT like the na8 you can also lower the anode voltage to 800 v and use it with a 80 WS it miss also the front glimmlampe but i have somewhere a second set and i believe it's present 1 Link to comment Share on other sites More sharing options...
kriegsfunker Posted January 8, 2019 Author Share Posted January 8, 2019 Interesting device. Thank you for sharing. Does it have a giant capacitor with a bleed resistor on the 1000V output? Link to comment Share on other sites More sharing options...
val Posted January 8, 2019 Share Posted January 8, 2019 Thanks @tornfuté, now i know how T100 looks like. BTW, the biggest selenium rectifier i have seen so far is inside the Gleichrichter.a Link to comment Share on other sites More sharing options...
kriegsfunker Posted January 8, 2019 Author Share Posted January 8, 2019 These selenium rectifiers go bad. I don't know how, but they do. Link to comment Share on other sites More sharing options...
kriegsfunker Posted January 8, 2019 Author Share Posted January 8, 2019 Yes, there are thin twisted wires that come from both sides of the resistor. The whole thing looks good, and I have cleaned the wires. I will take a steel brush to the wires and see if that works. BTW, the clamps were corroded, but I cleaned them. That still didn't make the resistor work. Link to comment Share on other sites More sharing options...
val Posted January 8, 2019 Share Posted January 8, 2019 3 minutes ago, kriegsfunker said: These selenium rectifiers go bad. I don't know how, but they do. Yes, they disintegrate with time and catch even fire, so with them should be careful... http://w3hwj.com/index_files/RBSelenium2.pdf Link to comment Share on other sites More sharing options...
kriegsfunker Posted January 8, 2019 Author Share Posted January 8, 2019 What is the advice here - replace them (hide the small ones somewhere below)? Or continue to use? Link to comment Share on other sites More sharing options...
val Posted January 8, 2019 Share Posted January 8, 2019 14 minutes ago, kriegsfunker said: What is the advice here - replace them (hide the small ones somewhere below)? Or continue to use? Radio performance is dictated by the quality of the PSU. So for sake of tube's health and performance i trust modern rectifies. But when i use selenium rectifies, i will never leave them unattended or run them in hours, i just have some bad experiences with them. They are risk. Link to comment Share on other sites More sharing options...
kriegsfunker Posted January 8, 2019 Author Share Posted January 8, 2019 Thanks Val. Link to comment Share on other sites More sharing options...
val Posted January 8, 2019 Share Posted January 8, 2019 https://en.wikipedia.org/wiki/Selenium_rectifier Quote Selenium rectifiers had a shorter lifespan than desired. During catastrophic failure they produced significant quantities of malodorous and highly toxic fumes Link to comment Share on other sites More sharing options...
kriegsfunker Posted January 9, 2019 Author Share Posted January 9, 2019 Monster capacitor, I will have to re-form it. It has the right capacitance when measured. Any good ways to reform this one? Interesting that the capacitor was made in the Czech Republic. Link to comment Share on other sites More sharing options...
tornfuté Posted January 9, 2019 Share Posted January 9, 2019 hello i open the left side , right side and back of SGLT 100 , design is different from NA8 there is not only a 30 uf capacitor , but 2 of 10 uf , i see no resistance like on yuri set . there is a big resistor but for dropping the anode value , one connection is broken , i know somebody who own a NA8 i will asks him if he would be kind to open his set and measure the resistance . i had never open the SGLT100 and i see that also is missing 2 glimlampe Inside see white sockets . overall it seems me Inside is in good cosmetic condition but need doctoring if it will be put again in service 1 Link to comment Share on other sites More sharing options...
val Posted January 9, 2019 Share Posted January 9, 2019 2 hours ago, tornfuté said: hello i open the left side , right side and back of SGLT 100 , Thank you Pierre, very interesting to see the inside of T100. Link to comment Share on other sites More sharing options...
kriegsfunker Posted January 9, 2019 Author Share Posted January 9, 2019 Thank you Pierre. Very interesting device. Looks like the big green resistor is the bleed off resistor for the large caps. Link to comment Share on other sites More sharing options...
kriegsfunker Posted January 9, 2019 Author Share Posted January 9, 2019 On 08/01/2019 at 13:42, val said: https://en.wikipedia.org/wiki/Selenium_rectifier Here is a replacement rectifier to hide inside the selenium one. Any problems with the parameters? http://www.eicsemi.com/datasheet/RS3FS.PDF Link to comment Share on other sites More sharing options...
val Posted January 9, 2019 Share Posted January 9, 2019 1 hour ago, kriegsfunker said: Here is a replacement rectifier to hide inside the selenium one. Any problems with the parameters? http://www.eicsemi.com/datasheet/RS3FS.PDF You should take into the consideration voltage drop first - selenium has high voltage drop and if you replace it just only with silicon, voltage will be off. See my first pdf link, there's calculation how to add resistor. 1 Link to comment Share on other sites More sharing options...
tornfuté Posted January 10, 2019 Share Posted January 10, 2019 About Resistor I receive answer from NA8 owner the resistance is 25 k around 40 watts i have receive dienstschrift of NA8 but must asks if i can put it here 1 Link to comment Share on other sites More sharing options...
val Posted January 10, 2019 Share Posted January 10, 2019 5 hours ago, tornfuté said: i have receive dienstschrift of NA8 but must asks if i can put it here It would be very nice if you get a permission for that, since we plan to create here separate download area for all kind of documents and schematics. Link to comment Share on other sites More sharing options...
kriegsfunker Posted January 10, 2019 Author Share Posted January 10, 2019 7 hours ago, tornfuté said: About Resistor I receive answer from NA8 owner the resistance is 25 k around 40 watts i have receive dienstschrift of NA8 but must asks if i can put it here Thank you for that information Pierre! The NA8 schematic would be very nice to have for the restoration. Link to comment Share on other sites More sharing options...
tornfuté Posted January 11, 2019 Share Posted January 11, 2019 The schematic is very simple , one transformer for HT and one for LT a bridge , filter . Yuri you are right the big resistor in my SGL T 100 must be the equivalent of your resistor . In Na8 the owner tell me that the capacitors must still be original . In notice i get it’s not said the value , nor if it’s paper or electrolytics capacitors, but they are still working 1 Link to comment Share on other sites More sharing options...
val Posted January 11, 2019 Share Posted January 11, 2019 Pierre thank you very much! Is there in the NA8 manual glimmlampe type mentioned? Link to comment Share on other sites More sharing options...
kriegsfunker Posted January 11, 2019 Author Share Posted January 11, 2019 1 hour ago, val said: Pierre thank you very much! Is there in the NA8 manual glimmlampe type mentioned? I have been away on business. I will lightly sand the glimmlampe metal to see if there is any writing there Link to comment Share on other sites More sharing options...
tornfuté Posted January 11, 2019 Share Posted January 11, 2019 val unfortunately no reference , no value , i get answer from germany and it's asked me not to put on internet , i am sorry but i will respect this rule otherwise i will not get anything from him later . the notice for SGL T 100 is D 943/2 Link to comment Share on other sites More sharing options...
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