Probably the most robust type EL84 tube ever built: the NOS Russian 6P14P-ER (kyr. 6П14П-ЕР).
Absolutely comparable to the Western European E84L / 7320 from Siemens, Telefunken or Philips / Mullard, especially in terms of durability and reliability.
rated at 10,000 hours of operation
design limit rating Ua= 500V, Ug2=500V
acceleration max. 300G
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