Russian electron tube 6J9P-E (6Zh9P-E) is an HF pentode with a steep characteristic, used in the input stages of broadband amplifiers. Equivalent to E180F, 6688
TG3-0.1/1.3 Thyratrone Tube. Low-power fast-acting thyratron tube with the xenon filling. A cathode is an oxide, indirect incandescence. Equivalent ~ 2D21 / 5727 / PL21.