Sylvania 8BQ11 Vacuum Tube Valve NOS NIB Eroica It measured 78/80 where minimum

It measured 78/80 where minimum (65%) is 50/50 and 100% is 77/77

Transconductance measured 48/48 for Tube One and 52/46 for Tube Two where minimum (65%) is 32/32 and 100% is 49/49

new in box DuMont 6LU8 tube tested to spec on our Paul Hart-calibrated TV7/U

They are dead quiet when the preamp is muted and have excellent frequency response

Tube Two is a bit microphonic and it is therefore recommended that this matched pair not be used in areas with excessive vibration

Sylvania 8BQ11 Vacuum Tube Valve NOS NIB Eroica It measured 78/80 where minimumThis new old stock, new in box Sylvania 8BQ11 tested to spec on our Paul Hart calibrated TV7 U. BECAUSE OF THE BIZARRE, INTRUSIVE AND DRACONIAN GERMAN PACKAGING REGULATIONS AND THE SEVERE FINES AND PRIVACY INTRUSIONS ASSOCIATED WITH THEM WE NO LONGER SHIP TO GERMAN ADDRESSES. WE WILL HAPPILY SEND YOUR PACKAGE TO A NEIGHBORING COUNTRY OR MAKE SUITABLE ARRANGEMENTS. IN 2021 WE PURCHASED 150,000 VACUUM TUBES. IF IT'S NOT LISTED, WE PROBABLY HAVE IT.