Love it! Sounds open, detailed, Spacious! warm and just wonderful in front on the X150.5 and it hasn't even warmed up! Thank You many times ZenMod and Jim 6l6 for the boards and abundance of knowledge! Added a bunch of extra iron to a 16 gage steel case from a clapped out crest audio pro power amp. Plan to rework the signal wire management and possibly fab some covers for the edcores. They just seem too close to input signal wires...And I have nice 16 gage steel covers. Peace
I haven’t found this in the thread yet…but can I assume the PS/regulator can be populated and tested before completing the rest of the board?
Antek AN-0218. 25va 18v secondaries. Be sure to order their nifty new covers, which were about an extra $10 each
And re PS, sure why not? Look at schema. Just adjust voltage to 15vdc after everything is complete. I believe it's always good to work that way though...
I believe It is possible Zen Mod has magical powers or at a minimum is truly a Savant! Sung or unsung, I, in this moment sing your praise! Bloody hell man this Iron Pre is so beautiful!
“magical powers”….doubtful. Clearly gifted (maybe genius), but I believe it’s his passion combined with years of “seat time”, whether it be at the bench or in front of speakers, that sets him apart.
no need for that, Edcors doesn't care for your signal wires
just imagine Elephant and Fly
The signal wires probably care about the power transformers and AC power wires though. At least the power transformers have covers.
One solution - rotate everything inside 90 degrees counterclockwise, locate the AC input and AC wires on the right side of the chassis, and locate the input and output jacks and wires and volume pot wires down the left side of the chassis.
One solution - rotate everything inside 90 degrees counterclockwise, locate the AC input and AC wires on the right side of the chassis, and locate the input and output jacks and wires and volume pot wires down the left side of the chassis.
Ok, good to know! Would there be any issue with adding another pair of outputs to an active x-over ?
what Ben said
regarding xover - if Rin of same is comparable with already connected power amp, why not
regarding xover - if Rin of same is comparable with already connected power amp, why not
A question regarding volume control. For my setu, Iron Pre is receiving balanced source from a PS Audio Perfect Wave MKII DAC which has what appears to be a WM8741 dac based volume control. I can't find the spec, but I suspect 12+db gain. I seem to have read that chip works best at greater than half volume. I'm thinking I could delete the pots on iron pre and increase R28, R30 by 5k or more so that I can control volume from the DAC (with a remote!). No?
you can't remove anything, you can't change anything - every resistor is having desperately necessary function 
if you want to delete vol pot, your choice, but leave rest as is
if you want to delete vol pot, your choice, but leave rest as is
Understood. I've got some Ideas. I'll report back. Peace and as always my deepest respect and appreciation. PS this circuit wired to the X150.5 is well just wonderful...
Yes Ben.I appreciate your observations. I am totally cognizant of the AC B fields.I studied physics as part of my science and engineering degrees..Maybe you noticed the welded square tube ac mains channel. Early days on this iteration.. I may attenuate volume from my DAC and do away with those long wires to front.