Svetlana 6550 6550C 6P27P Output Tube NOS-Testing 6AS8 Nonal T60 It sounds terrific and has

It sounds terrific and has great bass and sparkling highs and Mayall’s voice is warm and clear as a bell

each having four stamped crosses: two upside-down and two right-side up

These matched pair of engraved-base

50 and 50 where minimum (65%) is 30 and 100% is 46

Svetlana 6550 6550C 6P27P Output Tube NOS-Testing 6AS8 Nonal T60 It sounds terrific and hasThis new old stock testing Svetlana 6550C 6P27 perforated plate output tube was tested on our Maxi Matcher 2 with 400 volts on the plates and a bias of 48 volts for shorts, gas and transconductance. There were no shorts or gas. Plate current measured 67. 2 milliamps with a transconductance of 5640 micromhos. (New US made 6550s typically test with plate current from the low 20s to mid 40s with transconductance from 3500 micromhos or so.) It has