Svetlana 6550 6550B 6P27P Output Tube NOS-Testing 7476 7676 7676 bottom D getters and copper

bottom D getters and copper support rods

These three RCA 6MJ8 tubes are new old stock

Six links are available

new in box RCA 17AY3 / 17AY3A / 17BS3 / 17BS3A tubes tested to spec on our Paul Hart-calibrated TV7/U

These six US-made 5U8 tubes tested to spec on our Paul Hart-calibrated TV7/U

Svetlana 6550 6550B 6P27P Output Tube NOS-Testing 7476 7676 7676 bottom D getters and copperThis new old stock testing Svetlana 6550B 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 34 milliamps with a transconductance of 4310 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 perforated