Success! Zen Mod Iron Pre sounds amazing and is dead quiet. Thank you Zen Mod and Nelson Pass for sharing the design and expertise.
Thank you itsallinmyhead and 6L6 for curating and organizing the information in addition to the excellent build guide.
Thank you FrankWilker of AudioPerfect for your excellent Muses implementation and guidance in selecting the right solution.
Dialed in all the test voltages easily, and fired up first time. Sounds excellent. I was not aware of Frank’s solution until I was about 90% done with the Iron Pre. It is definitely possible to solder in his 90deg pcb solution after installing transformers but I wouldn’t recommend it. You can see where I kissed a relay with a hot iron, but only cosmetic. For now, the IR receiver is peeking through a 6mm hole in bottom plate. I will see if it will reliably accept bounced signal from the shelf under it. I brought the programming leds out of back of rotary encoder so they may be observed through the vents of case when programming the remote control. This is in front of my Aleph JZM driving Belle Kipschs and I am very happy with the sound. Thank you to everyone here on DIYAudio for their knowledge and willingness to engage in civil discourse.
Thank you itsallinmyhead and 6L6 for curating and organizing the information in addition to the excellent build guide.
Thank you FrankWilker of AudioPerfect for your excellent Muses implementation and guidance in selecting the right solution.
Dialed in all the test voltages easily, and fired up first time. Sounds excellent. I was not aware of Frank’s solution until I was about 90% done with the Iron Pre. It is definitely possible to solder in his 90deg pcb solution after installing transformers but I wouldn’t recommend it. You can see where I kissed a relay with a hot iron, but only cosmetic. For now, the IR receiver is peeking through a 6mm hole in bottom plate. I will see if it will reliably accept bounced signal from the shelf under it. I brought the programming leds out of back of rotary encoder so they may be observed through the vents of case when programming the remote control. This is in front of my Aleph JZM driving Belle Kipschs and I am very happy with the sound. Thank you to everyone here on DIYAudio for their knowledge and willingness to engage in civil discourse.
I see that I messed up in my post above notifying the people that I am grateful for their help. Thank you @Zen Mod, @Nelson Pass, @ItsAllInMyHead, @6L6, and @frankwilker among many others for sharing their knowledge.
So any thoughts on how this could happen? I get clean audio in the left channel but nothing in the right
I’m going to probe and compare the transformer pins. Also going to check the volume pot pins and compare. What else? Any good points to probe?
I’m going to probe and compare the transformer pins. Also going to check the volume pot pins and compare. What else? Any good points to probe?
If you have any short on the output for right channel. Check that you have high resistance between the two RCA pins on the right channel. Those high strand count wires can sneak in a single "frey" from (signal out +) to (signal out ground). Easy starting point.
@bilsch - First three things I'd check are below. (Don't know if you're balanced or SE)... Always post details of your build and pics, otherwise people are just going to ask for them.
1) Input - input signal makes it to the board. If not... fix wiring.
2) If yes to 1 - Check to see if signal gets to output pads using correct input selector (check a couple of the inputs). If yes, fix wiring.
3) If no - check to see if jumper header is installed? If signal gets in ... but not out... that's an easy win.
1) Input - input signal makes it to the board. If not... fix wiring.
2) If yes to 1 - Check to see if signal gets to output pads using correct input selector (check a couple of the inputs). If yes, fix wiring.
3) If no - check to see if jumper header is installed? If signal gets in ... but not out... that's an easy win.
Hi there, making progress on this amp. Dim bulb startup was uneventful and DC settings made. No smoke. I did forget the jumper headers and when I went to put them on they fit loose. I can’t figure out what’s up with that so I ordered more. Here are some progress pics of my very diy effort.
Attachments
If the jumper is on the right side up, you can gently bend the pins outward until things are tight.
bending pins is no way to do it, issue is in too wide contacts in jumper itself
if possible, squeeze contact sides, using needle
if fully contained in plastic, just toss them, buy different
if possible, squeeze contact sides, using needle
if fully contained in plastic, just toss them, buy different
if, by having toroid on top of signal iron, you end with hum, don't blame Mighty ZM
functionality always goes before aesthetics !
Ok so i think i figured things out. Volume at zero i get sound out the right channel. Volume out full i get sound out of the other channel. Volume at the mid point i get sound out both 😉
I hooked up the volume pot wrong!
Not sure if this photo will help show that but 😉
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Post in thread 'Iron Pre Essentials Kits For The DIYA Store - Register Your Interest'
https://www.diyaudio.com/community/...re-register-your-interest.390509/post-7833450
So now that the left channel is wired right everything is working properly. Imagine that!
I made a bad assumption that the pins were the same orientation for left and right from the pot. They are not!
Sounds great. No hum. Nice and clear!
Thanks @Zen Mod and @6L6
https://www.diyaudio.com/community/...re-register-your-interest.390509/post-7833450
So now that the left channel is wired right everything is working properly. Imagine that!
I made a bad assumption that the pins were the same orientation for left and right from the pot. They are not!
Sounds great. No hum. Nice and clear!
Thanks @Zen Mod and @6L6
^ I do. 🙂
Should be the week beginning the 11th. We'll see if the stars align. Make sure to do the "Notify me..." through the store.
Should be the week beginning the 11th. We'll see if the stars align. Make sure to do the "Notify me..." through the store.