A range of NOS USSR tested tube upgrades for Chinese 6J4 amplifiers
USSR tested 6J4 Equivalent – 6J4P (6Ж4П) vacuum tube upgrades for Douk, Nobsound etc., and all other Chinese 6J4 amplifier Kits.
Name: 6J4P (6Ж4П)
Equivalents: 6S2P (6С2П)
Manufacturer: Novosibirsk factory
Condition: NOS (new from old stock), never used, in original boxes
Date of manufacture: c.1963
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