6DJ8

It is distinguished by its very high transconductance, mostly the result of its frame grid construction.

The 6DJ8 was designed for use as a low-noise amplifier in VHF and UHF TV tuners, an improved successor to the usual 6BK7, but due to its high gain it was heavily used in high-end test equipment, for example, most high-quality oscilloscopes from the 1950s to the 1960s utilize a number of 6DJ8 tubes.

New Old Stock (NOS) 6DJ8s and ECC88s produced in the past by major American or West European vacuum tube manufacturers (such as Philips or Amperex) remain extremely popular with and highly sought by audiophiles.

A version (direct equivalent) of this tube was also produced in the Soviet Union as 6N23P (Russian: 6Н23П).

As of 2015[update] the tube was being produced in three versions in Eastern Europe - Slovakia by JJ Electronic (ex-Tesla), and in Russia: 6DJ8 for Sovtek and 6922 for Electro-Harmonix.