Anyone try modern 6sn7 Shuguang WE type vs NOS RCA,Ken Rad

Lots of words in this rant from about 2009, and worth reading it all at one’s leisure.

In the meantime, this is the relevant message, about half way down just above the picture of the tube on the left -

This is why the CV181Z might not be a drop in replacement for the 6SN7. Typical 6SN7 heaters draw about 0.6A and the CV181z draws about 0.9A (900mA), the old Mullard CV181 drew 950mA. This 50% increase in heater current amounts to 0.6A for a pair of CV181 in a circuit, which as you can see represents the load of a whole extra double triode.

I’d be more decisive. "This is why the CV181 (Z, whatever) IS NOT a drop in replacement for the 6SN7." Eventually your amp will take up smoking.

The shuguang CV 181 tubes are a 6sn7 drop in replacement, the Mullard cv181 tubes are not they have a higher heater current of 900ma.

@invalid That is blatant misinformation. It has to be also deliberate as you have clearly read the quote I provided which mentions Mullard (drawing 950mA, by the way).

Care to explain to the community?

I have been running a pair of the Shu Guang WE6SN7 Plus tubes in a Dennis Had Inspire headphone/preamp for about a year now and love them. Have about 700 hours on them with no issues at all and they replaced a pair of Sylvania 50s chrome dome tubes that have proven to be my favorites till the Shu Guangs showed up, still go back to the chrome domes every now and then but do prefer the Shu Guangs overall. I am a Shu Guang/Psvane fan and have been since I tried their smaller signal tubes 10 years ago, currently run at least 23 of their tubes in preamps, amps, headphone amps, dacs and phono stages and have had no failures as of yet. VIVA tube is a good source and I have had really good luck buying on ebay direct from China. I thought it would be prudent to look for readily available current issue tubes and the Psvane and Shuguangs have allowed me to have a go to that is fresh stock. When I reference their small tubes I am referring to their Treasure series. I just bought a Psvane Classic Series 274B rectifier Tube and hope it works out as right now Brimar rectifier tubes are my favorites. Enjoy the music

That is blatant misinformation. It has to be also deliberate as you have clearly read the quote I provided which mentions Mullard (drawing 950mA, by the way).

Care to explain to the community?

You must have read my post wrong, I acknowledged that the nos mullard's are not drop in replacements, but the shuguang CV 181's are, as they are not the same as the Mullard cv181's. I have no idea why shuguang labeled them this way.