Not an RCA, or a GE, but still functional for a lot less money.
I was originally not using these for audio, but to bring a US Army transmitter back to operational status after 75 years. It also operates on the 175 meter band, so keying it up would not be prudent or legal. The old transmitter had a new tank built for it in the 80 meter band, and was brought up in AM mode for an output of 75 watts. The next logical step was make a small hi fi, and compare these to the 1942 date code RCAs. Like most Chinese tubes, these were a bit grainy and airy sounding, but after having been used in an old transmitter the graininess was not nearly as pronounced, and they actually sounded pretty darn nice. I'd even go as far as to say they sounded "different rather than markedly inferior" to the RCA or GE 211. I preferred sound of the RCA, but maybe that is price justification psychology at work. Shuguang did a pretty nice job on these, and I will be using some more of them in another US Army Air Force radio from the era of the D Day invasion of France. The dynamotor is the hardest part to get working reliably on those old radios. Without the dynamotor the radio won't work properly, but I have good dynamotors so we can effectively judge how well these 211s actually function in a transmitter. They do perform to military spec, and no problems as of yet. $70? Compared to $1700? 5 Stars! What can I say. No way is the old RCA 211 at $1700-$4000 per valve, Sorry, but no. I'll go back into MOSFET designing, and get really good results.