Mullard AZ41 Vacuum Tube Valve NOS NIB

Mullard AZ41 Vacuum Tube Valve NOS NIBThis new old stock, new in box Mullard AZ41 tube tested to spec on our Paul Hart calibrated TV7 U. It is has a latter day Mullard logo and was made in France. 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

Transconductance measured 35

This lot of RCA 2050 thyratron tubes were tested on our Paul Hart-calibrated TV7/U

These four GE 6B10 tubes tested to spec on our Paul Hart-calibrated TV7/U

This is a Dutch auction for Sylvania 35W4s

This new old stock-testing matched quad of Sylvania 7A7 tubes was tested on our Hickok 800 and all measured 1900 micromhos where new/nominal is 2000 and minimum (65%) is 1300

dimpled-sheet getters and two additional support rods per tube for increased rigidity and lowered microphonics

32 and 35 where minimum (65%) is 23 and 100% is 35

40 and 62 where minimum (65%) is 40

(New US-made 6L6GCs typically test with plate current from the low 20s to mid 30s with transconductance from 2200 micromhos or so

It is dead quiet when the preamp is muted and has excellent frequency response even though this amp was designed for 6SN7s

Both tubes have gray

They have 2-22 188-5 and 2-35 188-5 date codes/EIA code