Valvo 12AT7 ECC81 Vacuum Tube For Your Univalve Zenith 7476 7678 These tubes all have small

These tubes all have small logos as well as 048

black 17MM plates

This hardcover book -- and its dust jacket -- is in very good condition

This matched pair of milspec Chatham Electronics 6H6 / JAN-CAHG-6H6-WGT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Valvo 12AT7 ECC81 Vacuum Tube For Your Univalve Zenith 7476 7678 These tubes all have smallThis Valvo 12AT7 ECC81 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured an underwhelming but well balanced 40 42 where minimum (65%) is 50 50 and 100% is 77 77. This tube has nice silkscreening; a flared base; sutured tops and excellent flashing. It sounded great in my Bottlehead, though is not recommended for this headphone amp which was designed for