Iron Pre Essentials Kits For The DIYA Store - Register Your Interest

Beautiful!! What is the little chassis for?
I have some Broskie 12VAC SRPP boards needing a home. Hoping to pack the boards in there with the transformers on top and the tubes poking out. If that doesn't work, will repurpose it for other front-ends because I have been thinking.

The long term plan is to build a bunch of "front-ends" to play "flavor-o'-the-month" with the F4s. On the dock:

1. the above mentioned tube boards
2. the 2022 DIY front end
3. ZM's iron pre
4. BA-3 gain stage
5. a Broskie noval Aikido front-end (once they come back in stock)
6. an M2x front-end w/ all the daughter cards (will be my first attempt at adapting a circuit, laying out a PCB and sourcing fabrication).
 
I'm a little bit confused here. (Not so much, at least about it.)
I have learned so far that the XLR connector pinout is as follows:
Pin 1: Ground/Shield
Pin 2: Positive/Hot
Pin 3: Negative/Cold
May I missed something?
There may be other connection standards.
^ ?

I assume if you ordered the balanced chassis that you'll be building a balanced Iron Pre - You still need a dual gang pot for each channel for balanced. One for (+) and one for (-) ...

Draft of wiring...

View attachment 1235963
 
^ That is an excellent catch. Pin 1 and Pin 3 are reversed. I'll update ASAP.

Thank you!

Edited to add an updated pic. Apologies for the error. :blush:
 

Attachments

  • Bal Wiring.jpg
    Bal Wiring.jpg
    153.4 KB · Views: 133
Last edited:
I would like to ask some things:
I've routinely using these IC sockets for almost all of my builds.
So I can change easily all of the low signal semiconductors, even there is an accidental failure, or just for new experience.
So what would be the best choice at the positions J1, J2, J3, J4?
I have plenty (relatively) of them to choose.
Another question, can I test Quasimodo on the fly?
I have sockets on the board for all of the necessary parts, to change quickly them.

And last, but not least, I want to thank everyone for this project, it's one of the best in the history of diyaudio.
I say this without listening to IP yet. 😉
IC sockets.jpg
 
  • Thank You
Reactions: ItsAllInMyHead
Another question, can I test Quasimodo on the fly?
Can you determine the value of the snubber resistor with the transformer connected to your Iron Pre boards? If that is your question; no. You need to test the transformer by itself.

Can you see if your snubber circuit is working properly in situ? Maybe... You could try scoping the ringing, but if you did get the proper value for the snubber resistor using the Quasimodo... or even without the snubber, I don't know how much difference you would see re: ringing. Me... I would not worry too much.

I admit that I am unsure of your question. So, if I got both of those wrong, my apologies.

it's one of the best in the history of diyaudio.
:nod: No secret how much I like it. Can't wait to hear what you think.

Thank you for posting pictures. It is fun to see some builds.