WF Berlin EF800 CV5092 pentode
premium, highest quality, great sounding, gold pins tubes
closely matched pair NOS, never used tested, selected.
made at East Berlin WF (former Telefunken) tube factory in 1973
both tubes have same serial code: 350342
Test results:
 tube1: Ia=13mA (130%)
 tube2: Ia=14mA (140%)
where 10mA is 100% for the new tubes
Telefunken also branded these tubes itself, as you can see at the last picture
Telefunken branded tube is not for sale - for info only!
Perfect tubes for MIKTEK CV4 MK9 MIC ond other professional audio equipment
 no boxes,  tubes are from large military bulk
you will get the tubes from the pictures
I always send tubes by priority registered mail with tracking number within hours after receiving payment