fuzzroffe
100+ Head-Fier
Rebuilt my "Brute Force" headphone amp. It was originally a mu-follower with paralleled 6SN7s into paralleled 6BX7s and sounded very good with high impedance headphones, but I wanted something that could drive low impedances without transformers. I found a schematic for an Aikido front end driving a White cathode follower so I ripped out the old circuit, keeping the regulated 300V power supply, and just built it. So externally it's identical, with the same tubes, but with a completely different circuit underneath
My 5Y3 was acting funny and not giving enough voltage so I put in a 5R4 instead. There's some noise when I get past 12 o'clock on the volume. I know there's a ground point I have to fix and I may have to re-run some wiring, unless the noise comes from the regulator tubes... So far it behaves good even with 32 ohm Grados. I have a couple of 6BL7's so I might put a 4PDT in to switch plate/cathode resistors for them.
My 5Y3 was acting funny and not giving enough voltage so I put in a 5R4 instead. There's some noise when I get past 12 o'clock on the volume. I know there's a ground point I have to fix and I may have to re-run some wiring, unless the noise comes from the regulator tubes... So far it behaves good even with 32 ohm Grados. I have a couple of 6BL7's so I might put a 4PDT in to switch plate/cathode resistors for them.