unknown Tubes

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Further information, which can assist you in your decision making process, you find in our guides.


Unknown tube types

In this category we show you vacuum tubes, which can not yet be identified - mostly because of the missing type designation. For many manufacturers, we find the types on the tubes, which are both resistant to aging and wiping. Especially in the case of older membrane and valerian tubes, however, the imprint can easily be blurred by mere contact. Often, the tube can then be assigned by remaining remnants of the inscription and by the comparison of the internal mechanical structure. However, this does not always lead to success. It is particularly difficult if we have unknown types in our camp. Here, we need to get qualified feedback on the photos shown in order to make a determination at all. You may also recognize one of the tubes shown here. Then please contact us; They help us a lot.