Soviet Highly Reliable Output Beam Tetrode 6S41S. 

You're buying lot of 1Pcs Vacuum tube!

The 6S41S triode is designed to work as a control tube in electronic voltage stabilizers. It is used in sources of secondary power supply for stationary and mobile radio-electronic equipment for general purposes. Works in any position.
Stamp of technical control department of the manufacturer ” ОТК “
Made for Military equipment.
If you are looking for some other radio components or lamps, please contact us and we will help you find them.We still have a lot of different components produced in the Soviet Union. We have photographed only part of what we have in stock.
This item will be send by air mail , with tracking-number.When purchasing more than one item please request an invoice, so I can
combine your purchases.If you have any questions regarding item's condition, shipping, payment etc., please contact me.