With my set up, the Sophia Princess 274b+6FD7 sounds very open, clear detail, and warm. It doesn't sound sweet tubby to my ears. With a new Mullard GZ34+6FD7 is just add more weight and more energy. I like Mullard GZ34 better. The Sophia Princess 274b sounds very light in compare.

I'm not sure if WA6 or WA6SE is tubey sounding. With my setup, it's depending on the tube. It's really showing you a different sound characteristic with different tube brands. It's just amazing sounding amp for this price range.

One more, you may need to let the amp warmup for 10-15min. Let all the tubes warm up. For my main system with my power tube amp, I found that if I turn on and listen music right away. I get the hum and buzzing very loud noise. I need to let it warm up 15-30min.

Yes "twisting" is the right word. Most of the time it works with my tubes hum. But sometimes it comes back, so I twist it again and the hum noise gone. I think you need to twisting it to the right position until the humming noise is gone. I guess the legs and socket is not attached to each other...

This one is same as mine https://www.upscaleaudio.com/products/mullard-new-production-gz34-5ar4-rectifier and http://www.dougstubes.com/mullard-gz-34.html It's not NOS! it's new production made in Russia. I brought at that time around $28. About buzzing sound. You may try to push a tube around...

I like a new Mullard GZ34 from Russia and Sophia Princess Mesh Plate 274B with 6FD7 tubes. The more I listen to GZ34 the more I like it better than Sophia Princess. It seems to have more power and weight. The detail's about the same. It's more involve with my system setup. Plus it's way more...

Woohoo I just replaced 6FD7 after 2 years with 6DR7 RCA. I need to turn on more volume tho. But The sound is very nice, sweet midrange, warm, detail, and great bass detail. Overall, I like it better than 6FD7 and 6DE7. To my ears, 6FD7 sounds very clear, clean detail, and great space. 6DE7 is...

Good idea. But I think I'll stay w/my HD600

Thank you Tilpo and NamelessPFG  

Please ignore this thread. I posted in a headphone forum instead.

I'm thinking to upgrade my old beloved Sennheiser HD600. I'm looking for a headphone that sound similar character or close to Merlin VSMM+Tube power amp. My budget is 1k - 3k. I'd like to hear your opinion. Any recommends I'll appreciate it.

Ops! I think I posted in a wrong forum. Yes, I'm looking to upgrade my headphone. I'm looking for a headphone that sound character similar or close to Merlin VSMM+Tube power amp. My budget 1k - 3k. Stax Omega2 Mk2?

I'm thinking to upgrade my old beloved Sennheiser HD600. I'd like to hear your opinion. Any recommends I'll appreciate it.

let me know how you like it, iTetragrammaton

Thank you guys. Finally, I decided to get the X-CAN v8 because I like a tube+ss sound of it. And I just got it today. The line-in connect to my MacPro w/HD600. It has a smooth sounding, dynamic range, good soundstage, bass control, overall clarity, etc as Sam Tellig's column in September...

Can anyone give a feedback between this two amps please? I couldn't find much review about them. I'll appreciate it.