Lansdale Tube Company 5963 / 12AU7 / ECC82 Vacuum Tube Valve Industrial-Grade For Your Univalve Or Bottlehead February 19 2024 I am playing them in

I am playing them in one my Radio Craftsmen RC2 mono blocks as I write and they sound super

This pair of US-made

but this was no issue with the amp at full volume and when actuating the amp's controls

Transconductance measured 5340 and 5260 micromhos

S5E and 913 date codes

Lansdale Tube Company 5963 / 12AU7 / ECC82 Vacuum Tube Valve Industrial-Grade For Your Univalve Or Bottlehead February 19 2024 I am playing them inThis Lansdale 5963 12AU7 ECC82 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and it tested as follows: 77 72 where minimum (65%) is 50 50. This tube has steel support rods; a top, square, corner anchored getter; an acid etched bottle; gray plates with two rectangular holes per plate and good flashing. Landsdale was the in house tube manufacturing division of Philco. In the