Originally Posted by biarritz
After a disasterous build of the SOHA v3.0 I bought this amp. It came with all parts pre mounted. All looks very nice, but I am not satisfied with the sound. There is a hugh lack of bass and all sound a bit muddy. I placed a nice PIO at C101. Are there any other changes I could make to improve the sound?
What are you feeding it with? Did you buy the power supply 8Audio offer, or are you using something else? Are you using the stock Chinese tube? And, like Nick 214 asked, what headphones are you using it with?
There should be no
shortage whatsoever of bass with this amp, from my experience; quite the contrary, in fact. (But remember, my power reservoir cap, C103, is - cough!
- 12000uf, which is undoubtedly excessive, and I think everyone else who built one here used something larger than the spec'd 1000uf, so upgrading that to a larger cap - 4700uf might be a good compromise between "too little" and "outright crazy" - might be something to look at.)
My only other idea would be to pick up an inexpensive name-brand 6DJ8 or 6922, just on the offhand chance the Chinese one it came with is bad. If the tube's at fault, and it's really as bad as you describe, then pretty much anything ought to be a huge improvement.