Quad of EL41 测试 Tungsram 管-

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Item: 395051307013

物品状况:二手: An item that has been used previously. The item may have some signs of cosmetic wear, but is … 阅读更多内容关于物品状况二手: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. 查看所有物品状况的定义在新窗口或标签中打开
物品状况:二手
Tungsram:Tungsram
Type:Power Tubes

eBay For sale a quad of selected Tungsram EL41 output pentodes. They were tested strong for emissions and transconductance. All are the same construction. ************************************************************************************** About the testings Most of my tubes are tested, but always pay attention to the description in the listing! Vacuum tubes can be tested for variaty of attributes, but they are very rarly beeing tested for everything. I usually test for the attributes I find most important with the specific tube. I take responsability for these measurements, but not for other attributes that I have not tested! Also keep in mind that when measuring vacuum tubes with different test equipment there will always be differences in the results. However these differences shall not be significant (usually within 15%), and when done right, won’t show a bad tube as good, or a barely good tube as very strong. If you are not sure what you need, or how to choose, message me, and I will try to help you make a decision that fits your needs. The tests I do: – Ia / emission test – is the most common test, which shows how strong is a tubes’ plate current according to nominal catalog data. The tests are done usually on a standard operating point, and these values will be shown on a tag, or in the description. Usually above 80-90% of nominal we say it is Strong (or NOS), and above 60% it is still Good. – S / transcondutance test / or GM – is the second important attribute of a tube indicated as mA/V. These test are done at the nominal plate current, and also will be indicated on the test tags. – Noise test – is made where it is indicated in the description. It means the tube has been tested for weird noises or microphony while playing music. It will be shown on the test tag as a mark. Keep in mind that noise test does not guarantee any sound quality, which is always the product of a specific tube type, brand, Ia and S attributes, and the amplifier as a system. Noise test means that in a simple audio circuit the tube did’nt make any disturbing noises, hum, and was not microphonic even when gently tapped. (In an audio system many parts, or the setup can couse weird noises, but it is not necessarily coused by the tube, but by certain interferences.) ************************************************************************************** Shipping The tubes will arrive to you in a well protected package, and will be shipped within the next business day from payment. The package will be sent with priority, and tracking number will be provided. If you find other tubes in my inventory, I will gladly combine shipping, and the cost will stay as listed under 0.5 kg total. For a package that exceeds this weight, we shall discuss the shipping cost. ************************************************************************************** About me I am a private seller located in the EU. I buy and sell vacuum tubes. I’m dedicated for reserving this beautiful technology, and for that purpose I select, test and rate my tubes. I build my own testers, working with them daily, and I know how they operate. I also a test enthusiast, who likes to learn more about tubes and tube testing. I am dedicated to sell tubes as described, and believe these tubes will perform as they should be according to the description.

Frequently Asked Questions About Quad of EL41 测试 Tungsram 管- in My Website

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Frequently Asked Questions About Quad of EL41 测试 Tungsram 管- in My Website

What are the best-selling Quad of EL41 测试 Tungsram 管- on www.fibusfamilyfoundation.org?

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