FX-Audio Tube-03 vs xDuoo MT-602

[Onira]

Would there be any big difference if I would change old Tube-03 with two MULLARD EF95 to MT-602 swapping my tubes of course?
Or should I consider buing something higher for single ended circuit like TA-66 ??

 

[Saponetto]

As far as I can remember, the Xduoo MT-602 was much prone to generate hum than the FX-Audio Tube-03 but no huge differences.

My pick is for the Xduoo TA-66, if you enjoy a full-tube OTL amp made like a tank.
It obviously plays on another rank.

Which headphones should these devices drive?

 

[Onira]

I have seen TA-66 and it looks like Darkvoice 336SE OTL
I already have MT-604 so I don't think I'd need any combo for SE and BAL input/output

The main reason I would like to replace my old TUBE-03 is that I need to connect it to an amp

 

[Onira]

Sorry I forgot the last line

I mostly use Sennheiser HD660s with tube.
I also have ATH-MSR7b but I use them with FiiO BTR5_2021