Svetlana 6550 6550B 6P27P Output Tube NOS-Testing 7476 7676 7676 This tube has great bass

This tube has great bass and sparkling highs and Mann's voice is warm and clear as a bell

Six links are available

bottom D getters and copper support rods

There are a few pops and ticks

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

Svetlana 6550 6550B 6P27P Output Tube NOS-Testing 7476 7676 7676 This tube has great bassThis 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