Tubes Articles
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![]() A noisy amplifier
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![]() Using Selenium Diodes
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![]() Portrait of some interesting tubes. Some broken apart. Some pictured alive.
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Telefunken ECC803S <>The Holy Grail of small signal tubes
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![]() Game Over for EI tubes.This is about the famous EI tube factory. Unfortunately most of the equipment was scrapped recently. This was a shameful destruction of an intact tube factory. Read more about it here. |
Blue Glow in tubes
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Simple help page for Dynamic parametersYou have a good tube tester, but it cannot measure dynamic parameters, like Gm, Gain, or Rp? Well most of the time you can, but you need to make differential measurement.Instead of having to explain this just use this little Excel Worksheet. You can select the tube you want, or enter the data by hand in the right table. Then you need to do Measurement 1 + 2 and you have the Transconductance. (Gm). If you also do Measurement 3 + 4 you get in addition the Gain the Plate impedance. Even so, you can use this program to check the performance of a tester, that is able to test Gm or even Rp and Gain. And no, this sheet makes no errors. Any differences are caused by the tester itself, since there are analog circuits also in digital testers, and even digital, you have the problem of low resolution if cheap A/D converters are chosen, such as in the AT1000. DOWNLOAD HERE. |
A mysterious "constant current user"Or why voltage specified heaters should be voltage driven.
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About Tin WhiskersThis is what happens when you use 100% pure tin. |
About Stand by Mode |
About OVEN baking of NOS tubes |
Vintage instruments of my collection.Some are not easy to replace by modern electronics!
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