Svetlana 6550 6550B 6P27P Output Tube NOS-Testing 7476 7676 7676 This lot of three RCA-Victor

This lot of three RCA-Victor gray glass 50L6GT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

These three RCA 6MJ8 tubes are new old stock

I just read the liner notes and I was right about this album sounding 15-20 years ahead of its time as it was

bottom D getters and copper support rods

There are a few pops and ticks

Svetlana 6550 6550B 6P27P Output Tube NOS-Testing 7476 7676 7676 This lot of three RCA-VictorThis 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