Brand New, MINT NOS NIB Rare JUNE-1971 production Tungsram Industrial Grade EL84 6BQ5 Tubes. Each tube has individual RED Serial Number and Serialized Certificate. Made in Hungary. All tubes from the same batch.
Industrial grade tubes were subject to rigorous test and burn in process. These tubes were produced in limited quantities (between 5000-10000 tubes according to Zeitmann from Hungary). These tubes are hard to find these days. Tungsram made some of the
finer tubes in Eastern Europe due to its exposure to subsidiaries in
Gt. Britain and Austria. Awesome tone for Guitar Amps and great for
Audio.
NOTE: Those are NOT burn marks on the tubes. This flashing pattern is peculiar to Tungsram EL84's.
Also, the flashing pattern varies within tubes from the same batch/date code. It is normal. Tested and matched on Top of the Line Calibrated
Hickok 580 Lab Grade Tester recently calibrated by late Chris Haedt. 65%=7000 mmhos for EL84/6BQ5 on this tester.
Single Tube = $60. Select 2 for a Matched Pair.
