RCA 6680 12AU7 12AU7A ECC82 Vacuum Tube Valve Industrial Version NOS-Testing Perfect For Univalve And Bottlehead Number Engraved The following artists contributed to

The following artists contributed to this tape: Gervase DePeyer

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This pressing has very-light surface noise audible only in quiet passages

It tests below the cusp

Wizard-BRANDED 6K6G tubes was tested on our Maxi-Matcher with real-world voltages of 325 volts on the plates and a bias of -36 volts

RCA 6680 12AU7 12AU7A ECC82 Vacuum Tube Valve Industrial Version NOS-Testing Perfect For Univalve And Bottlehead Number Engraved The following artists contributed toThis new old stock testing RCA 6680 12AU7A ECC82 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured a nicely balanced 92 95 where minimum (65%) is 56 56 and 100% is 87 87. The 6680 is the industrial version of the 12AU7A. It has gray 12MM plates; excellent flashing for an extremely hard vacuum and extended tube life and a top O getter. I have played it