My earlier test pic was on a Pioneer PL-560 with an Ortofon 2M Bronze
Currently using the final version with a Rega Planar 8 with Hana SH
So if it is tested that boards are bug free, should we run a GB? 🙂 my TT is almost ready so I am thinking about a phono preamp 🙂
I say have at it if a few more people are interested in a build. The PCBs could probably use some fine tuning, but mine is working quite well (and quiet as my solid state Graham Slee). Still only have a few hours on it, but enjoying it very much.
Even at a small run, the boards are only about $5 each from JLCPCB. Unfortunately I don't have the time to manage more than the original 5 I ordered.
I have ordered a few more tube sockets to confirm what will fit for the Octal footprint. I'll follow-up once those arrive. I'm also going to finally put a proper 820K resistor on the output (which is still a Frankenresistor because I screwed up my original order at PCX).
I'm also getting ready to dip my toe in some tube rolling. First stop, some Sylvania 6SN7GTBs.
Even at a small run, the boards are only about $5 each from JLCPCB. Unfortunately I don't have the time to manage more than the original 5 I ordered.
I have ordered a few more tube sockets to confirm what will fit for the Octal footprint. I'll follow-up once those arrive. I'm also going to finally put a proper 820K resistor on the output (which is still a Frankenresistor because I screwed up my original order at PCX).
I'm also getting ready to dip my toe in some tube rolling. First stop, some Sylvania 6SN7GTBs.
I listened several EAR834 but Itch sounds more neutral to me, EAR834 sounds more like tube sound: can be more 2nd harmonics.
This has been my experience as well. I have a 6N2P-EV based 834P clone, which I would consider much more "tubey." That said, the 834 became more neutral after I changed to a shunt regulated PSU (the Broskie Janus on that one).
It seems to me the level of neutrality/accuracy of the Valve Itch could be attributable to the PSU, but that's just uninformed speculation.
I will say that the Valve Itch beautifully reproduces piano and drums. I've found the bass accurate and tight on many recordings, though it can be a touch boomy on others. Not enough time to attribute to recording/mastering, some something I've observed in my limited time with the Itch.
I also still haven't had time to check the channel balance, as recommended by Salas. Hopefully soon, but I'm preferring to listen to it rather than fiddle with it right now.
It seems to me the level of neutrality/accuracy of the Valve Itch could be attributable to the PSU, but that's just uninformed speculation.
I will say that the Valve Itch beautifully reproduces piano and drums. I've found the bass accurate and tight on many recordings, though it can be a touch boomy on others. Not enough time to attribute to recording/mastering, some something I've observed in my limited time with the Itch.
I also still haven't had time to check the channel balance, as recommended by Salas. Hopefully soon, but I'm preferring to listen to it rather than fiddle with it right now.
Some tonal tweaking for best synergy in various systems can also be done with VTA. Nose down is brighter. Electrical way is by C3. 15.5nF is brighter than 15.75nF for instance. And so on and so forth.
But don't tweak something beforehand when there are other 6SN7 scheduled to listen with.
Channel balance should be confirmed every time there are changes in the tubes set.
But don't tweak something beforehand when there are other 6SN7 scheduled to listen with.
Channel balance should be confirmed every time there are changes in the tubes set.
No tweaks planned. I’m really enjoying the build as is. The only changes on the horizon are messing with 6SN7s and maybe some Russian PIO caps.
0.1uF for C4 which is a calculated coupling value for VLF shaping, but if for C6 bypass it can be even smaller. 250V DC spec in any case.
Just a quick update on anyone thinking about working with the PCB I shared. I found that these valve sockets fit the board nicely if you take a minute to drill out the pads by 1/16"
Octal: Belton Socket 8 Pin Octal PCB Mount Long Pin (VT8-Pt)
Noval: Socket 9 Pin Plastic PCB GZS9-Y-Gold Tube Socket
Octal: Belton Socket 8 Pin Octal PCB Mount Long Pin (VT8-Pt)
Noval: Socket 9 Pin Plastic PCB GZS9-Y-Gold Tube Socket