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

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#2,504
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#2,507
Hello Gaetano,

if you are willed to order in Germany:
https://www.reichelt.de/pfostenbuch...-p14572.html?&nbc=1&trstct=lsbght_sldr::22819
https://www.reichelt.de/flachbandka...awg-28-14g-3m-p47638.html?&trstct=pol_5&nbc=1
a complete set:
https://www.reichelt.de/awg-28-set-...et-awg28-14b-p208109.html?&trstct=pol_1&nbc=1

https://www.conrad.de/de/p/bkl-elec...VXDgGAB1zxAmZEAQYAyABEgLWX_D_BwE&refresh=true
I think the postal charges will be much higher from Germany to Italy?

There are many other suppliers offering this. I am pretty sure, that you can also get a 14-pole ribbon cable in Italy.
Cheers
Dirk 😉
 
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#2,510
Are you using SE output or XLR output?

Edited to add pic of how it works with XLR output. Did this ages ago for my own build. I think it's correct... Of course I remembered where I filed it after I posted. :rofl:
 

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  • How K6 works SE to Balanced.jpg
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#2,513
XLR pinout is always:

1 GND
2 +
3 -


Iron Pre balanced is - as explained several times in these 2 threads, having 6db of gain nominally , details here:

- input Bal 2V , output SE 2V, output Bal 4V

- input SE 2V , output SE 4V, output Bal 8V

if you take a look at schematic, understanding that "SE" is 50% of "Bal" voltage-wise, everything is clear


maybe even clearer if details written as this:

- input Bal 2V , output SE 2V, output Bal 4V

- input SE 1V , output SE 2V, output Bal 4V
 
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#2,514
...... and even clearer, all for Iron Pre Balanced preamp:

- Bal In to Bal Out, gain is 2V/V = 6db; if you're taking SE out, that's one phase of Bal, so 50% of Bal voltage ....... live with that

-SE In to SE Out, gain is 2V/V = 6db; SE Out is also Bal positive phase ......... and then you have also (as addition) Bal negative phase for free!!! .......... live with that

:clown:
 
#2,516
Good Gemini is good

:clown:

but ........... you know that best construction of stage is when you have everything needed in one bundle

as we all were doing it numerous times - plethora of small pcbs tossed together in one case, with short wires in between, and from/to connectors

but - when starting from scratch - whatever stage is warming your heart ( AD797 or something else) - it's really best having everything on one pcb, solving several problems in one go

shunt regs - same as any other type - really best scenario is when reg and its load ( stage) are closest possible

all in all - physical arrangement is of same importance as circuitry itself

bunch of mediocre amps/preamps of this world are having pristine or even divine schematics, while ruined with physical arrangement as produced


 
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#2,517
Zen Mod said:
so, Iron Pre SE - How to wire AVC instead of [regular attenuator and output autoformer]

(Patrick, you can put link to in post #1)
Click to expand...

Many many thanks for this sketch. I'm just trying to make sure I'm understanding it right before I do anything stupid. For each channel:

One tap from the Slagle goes directly to the E5 pad (Slagle tap selection sets gain as clearly depicted in the graphic).

Jumpers installed across CW and WIP volume pot pads to bypass resistive pot.

(Here's where I'm a little unsure) -- The AVC controls volume after the Iron. So the output wiring from the Iron board goes to the signal inputs of the AVC attenuator. Then the preamp output RCAs are connected to the AVC attenuator outputs.

So, basically, the final AVC volume control wiring is the same in this configuration as it would be if we weren't using the AVC for gain (such as using the Cinemags instead)?
 
#2,518
jphabc54 said:
So, basically, the final AVC volume control wiring is the same in this configuration as it would be if we weren't using the AVC for gain (such as using the Cinemags instead)?
Click to expand...

exactly

step 1 - short resistive attenuator Volume pot pads
step 2 - wire Autoformer Volume instead of (original intended) Autoformer

easypeasy

now, how I did show wiring on that sketch - wiring of AVC instead of originally intended Autoformer is in such way that you're taking preamp outputs in original way - from output pads on pcb

what I forgot to note - in case of using Slagle AVC (or any made in similar fashion) - arrange stacking of EI lams "all alternating", resulting in highest inductance; that's making buffer's life more leisure

sketch re-linked here:


iron-pre-se-2023-v-3-how-to-wire-avc-png.1208544
 
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#2,520
Zen Mod said:
exactly

step 1 - short resistive attenuator Volume pot pads
step 2 - wire Autoformer Volume instead of (original intended) Autoformer

easypeasy

now, how I did show wiring on that sketch - wiring of AVC instead of originally intended Autoformer is in such way that you're taking preamp outputs in original way - from output pads on pcb

what I forgot to note - in case of using Slagle AVC (or any made in similar fashion) - arrange stacking of EI lams "all alternating", resulting in highest inductance; that's making buffer's life more leisure

sketch re-linked here:


iron-pre-se-2023-v-3-how-to-wire-avc-png.1208544
Click to expand...
:cheers:

Has anyone restacked the $300 Slagle to a 1x1 configuration? Curious how difficult it is since it requires bending back metal braces, rather than the screw bracing as depicted in the Slagle instructions:

https://web.archive.org/web/20190703040936/https://intactaudio.com/avc_stacking.html
 
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