My 6922 Tubes Are Too Bright!

   Hi , I have a SEP low power amp that takes a single driver tube of your requirement 6DJ8 . So I purchased the following -  NOS E88CC Telefunken, Tesla, CCa Siemens , Phillips SQ, Mullard , JAN Phillips ECG, Russian 6N1P. So now at about $1000 dollars later I put them all in for evaluation . I run Zu speakers which are bright . I avoid silver Interconnects and speaker cables to avoid added brightness . So the results are exactly what you’re asking . Number 1 is the Telefunken ( absolutely ) . Not too bright , flat response and Very Musical . Number 2 is the NOS Tesla E88CC Red Tip ( just like the Telefunken , but more liquid ). Number 3 is the Siemens CCa ( like the Telefunken , but a pinch more brightness ( I run this with KT120 power tubes)  . Number 4 is the Russian Rocket ( the good one ). After that it’s a mixed bag . The Holland Phillips is Too Bright . The American JAN Phillips is good, but plain . And the Mullard is my least favorite ( it’s like a blanket over my speakers ( Sorry To The Mullard Guys ). However the Mullard is good in multi driver tube amps as the phase splitter . My music source is digital with a Schiit Yiggy , a Rogue Pre with NOS Tektronix Telefunkens . My power tubes are NOS GEC KT88 and NOS GEC KT66 smoked glass ( yes the real stuff ). Rectifier is a NOS WE 422a or a NOS RCA 5U4G Black plate or a NOS Mullard GZ34 double getter . So my advise is to go NOS Telefunken E88CC . Also if you read the Tone Descriptions on the Brent Jesse site , you will find they are spot on . If I may offer any additional input , please ask . Best Wishes and Happy Listening , Mike. 

This is a good source/overview of NOS 6922. You can use it to find tubes suiting your sound preferences.

https://www.audioasylum.com/audio/faq/joes-tubes.html

I agree with whart. Try the new production Mullards. they are warmer sounding and not expensive. 

I was not aware that Mullard made a new production 6922/6dj8. Where were these found?

@buellrider97 excellent post thank you. My preamp uses six  6DJ8 tubes so cost is always a factor for me. Currently using the 7DJ8 Masuhitsa/National Union tubes from Upscale, I would not call them warm to me they are very neutral extended at both frequency extremes and quite well balance. Also excellent for the money. My preamp is not bright at all BTW as always it's not just the tube also the implementation!