ok you're right, 6CG7 / GZ34 sounds better with the HF2 also and has plenty of power. Sound is amazing.

I already swapped a regular USB cable for a kimber USB cable and it did reduce the noise somewhat, but not entirely. It's so feint that it cannot be picked up by headphones. It's inaudible unless the ears right up against my speakers at max volume. Some people have said using an external USB...

The noise I am talking about only shows up after playing at really high volume after an hour or so with 274b and HF2. The other rectifiers don't do this since I don't leave the volume up as high maybe?? I Never get any audible noise with my high impedance phones, even if I do turn the volume ALL...

My source (DAC1 USB) has the switch set to calibrated output, and my PC volume is maxed so I think I can rule that out... I'll try to clarify and provide some more perspective. With HD650 and DT990 I also listen around the 9-10'oclock mark when wanting to hear 'loud but not too loud'...

I've been testing out the WA22 with my Grado HF2 phones lately. So far only tried on the low impedance setting except for 1 test which I'll get to.... With 6SN7 / GZ34 it sounds pretty good, but it sounds a bit underpowered, I have to turn volume up higher than I do with HD650 and DT990. But...

I just got a used pair of HF2 in today. They sound great!! Much more lifelike than HD650 when playing acoustic instruments and for some reason the bass is less fatiguing on the HF2. I know many people have complained about smudges/scratches on the metal cups. The cups on mine are fairly...

Fwiw I noticed the same, 7236 has a fair bit of noise, 6as7 is dead quiet. I have an amperex GZ34 that I dropped and it caused a bit of glass to break free inside the tube. Don't have a tube tester but yesterday I was feeling gutsy and plugged it in... And it's working like a charm . Doesnt...

Well over the last week or so I swapped out the CV181 and 6SN7 several times and really couldn't pick out a difference. I tried but in the end just left in the 6SN7. If there is a difference it's too subtle for me to notice. Then I put in the Mazda 6CG7 and feel it opened up the sound a bit...

Yesterday I got in my 6CG7/6FQ7 to 6SN7 adapter, and fired up the WA22 with Mazda 6CG7 (w/ Sophia 274b and 6AS7). The adapters feel very well made. The 6CG7 reduced just a hint of midbass bloat that was hard to tell before but obvious now. I can perceive a bit more detail and layering when...

I just got the Amperex GZ34 tube I ordered off e-bay. As I was unpacking it, the tube fell out of the cardboard sleeve and onto the wooden floor. Didn't break the outter shell, but there is now a small piece of loose glass rattling around inside the tube. Can't tell what it's from. Could I...

Quote: Originally Posted by Clayton SF I swapped out 3 rectifiers. I let them warm up for 30 minutes and cool down for 30 minutes before swapping them out: 1) 5Z4G Russian (stock) 2) 5Y3G Marconi 3) 5Z4G Brimar They all exhibit the same low-level hum on the HD650. What's...

Sorry, meant Amperex GZ34.... thought I already fixed that typo but guess not

Seamaster, does Amperex GZ43 need an adapter to use in WA22???

Still couldn't resist posting some pics of the fired up Sophia on the WA22

I've noticed on the WA22 that the 5Z4G is much quieter than the Sophia 274B. The 5Z4G is almost silent (have to really strain to notice) while the 274B I hear a very 'soft' white noise. it's not irritating at all and is not audible during music. Some kind of vibrations on the mesh plate? I...