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

^ Never a worry. It is too late to add your name to the e-mail list. However, there will potentially be some extras left that will go into the store directly following. We'll know more in... 9 days (or so) each group has 3 days to make their purchases (I think), and there are potentially 3 groups (I think).

If they all sell through, then you will have to wait for the Super-Mega-Deluxe version to be in the store or perhaps another person will part with an extra.

I hope you're able to get one and that it works for your timing.
 
  • Thank You
Reactions: Holzarbeiter
Congratulations!!!!!
Thank you IAIMH, and I forgot to thank you for your dedication on this thread for us greedy boyz.

All I can say about this Iron Pre - man, this thing rocks!
I set mine to 12dB gain last night, since it matches better with my current amp and I am hearing sounds and some magic I've not heard before.
 
^ I am thrilled!

I think I had mentioned it before, but I'll repeat it. I think everyone should try this pre-amp. Reviews obviously are subjective, but when I was lucky enough to build a prototype and even luckier that my noob self got it to work properly :joker: ... I was gobsmacked. So... I figured I could try and help get it to all the little Greedy Boyz and Girlz.

Thank you for the kind words. And most importantly ... as always... Enjoy the tunes.

Patrick
 
If you think pots are different it should even out at full output.
It should be easy to test if the "amp core" amplifies x2. E.g. 1000 Hz 1V RMS in and 2V RMS out.

Could it be that one channel is running in SE-mode and other in BAL-mode where you think both channels are in BAL-input mode?
Or maybe one of the JFET-buffers does not work as expected in "bad" channel?
Without potentiometers connected, I measure a resistance of 0.4 ohm between CWW+ and CW+ in the left channel, whereas the right measures around the 2Mohm (CWW- and CW- left channel measures around 1.5 Mohm). Could this indicate a faulty relay?
 
If no pot is connected then CWW and CW is an "open circuit". So 0.4 ohm between these points is not expected.
There must be a "short-circuit"?

2Mohm sounds better.......do you have your fingers on probes since it does not show "infinite"?
Some dirt on circuit can also cause this.......


1692450690849.png
 

Attachments

  • 1692450627353.png
    1692450627353.png
    18 KB · Views: 61
If no pot is connected then CWW and CW is an "open circuit". So 0.4 ohm between these points is not expected.
There must be a "short-circuit"?

2Mohm sounds better.......do you have your fingers on probes since it does not show "infinite"?
Some dirt on circuit can also cause this.......


View attachment 1204187
Indeed I had my fingers on probe, so infinite is probable. I can't see any short on PCB, that's why I was wondering if it is caused by the relay. Measured resistance of Cinemags in circuit and the measure roughly the same.
 
Perhaps someone can spot a mistake?


If no pot is connected then CWW and CW is an "open circuit". So 0.4 ohm between these points is not expected.
There must be a "short-circuit"?

2Mohm sounds better.......do you have your fingers on probes since it does not show "infinite"?
Some dirt on circuit can also cause this.......


View attachment 1204187


CCW is connected to GND

CW is connected to appropriate signal common, which is incoming signal from relay selector

you have short to GND somewhere on relay group

eyes, beep test, lens, light
 
  • Like
Reactions: freebee