1176 question

**liron** · 09-13-2003 11:26 AM

hi everyone! , i'm building the gyraf 1176, thanks jakob [img]smile.gif[/img] , the thing is that i live in argentina and it's impossible to get the output xformer.
i wonder if i could use an UTC A-20 that i already have.

UTC A-20:
Aplication: mixing, matching.
Primary imp. ohms: 50,125/150,200/250,333 500/600
Unbal DC: 0
Secondary imp. ohms: 50,125/150,200/250,333 500/600
+/-2 DB from: 10-50.000
Pri res ohms: 64
Max level dbm: +15
Max level MW: 30
high electrostatic shielding

it can be used as a 600/600, this means it may work?
i don't know the turn ratios for the UTC A-20.
i have other UTCs LS and A series.
it's possible to use an op instead of the tranny as output?
but if i can't i will buy the lundahls, when i can... [img]smile.gif[/img]

about the meters, can't get the sifam here :( , but, i have 2 large 60's westones like the ones in the fairchild [img]smile.gif[/img] but, i don't think all the VU meters are the same, so what specs the meter have to be?

and just thinking...is it possible to use an input xformer as the UTC LS-10, LS-12X, A-10 in this solid state designs?

by the way i'm finishing 6 RCA BC2B micpres build with UTC LS-10X as input, 12AX7 , LS-50 as output, fixed gain, and sounds soooo nice!

thankyou, from argentina.....ezequiel

**Kev** · 09-13-2003 02:34 PM

I think the G1176 is happy to work withou trafos, so get the project operational and then experiment with trafos.

A VU meter is a VU meter.
I know many cheap UV meters are just standard meters with a scale.

You all need to have a basic passive VU meter that you know and trust in a box to use as a test device and for experimenting. see my site.

You use this meter that you already know, to refer to, when testing a new meter. A normal VU meter should just drop straight into this circuit with the minimum of adjustment.

**Mundox** · 09-13-2003 05:07 PM

I have a question, too,if you don't mind.
Where the hell can I get the damn 4m7 pot! :(

gyraf · 09-14-2003 03:40 AM

Ezequiel,

The UTC A-20 should work fine - just wire it 600:600.

Mundox,

Farnell 816590 POTENTIOMETER 4M7 (PREH-WERKE 65000-000-4M7)

Jakob E.

**Mundox** · 09-14-2003 04:52 PM

Cool.Thanks jakob.But they don't ship to US do they? Do I buy thru newark?

**Mundox** · 09-14-2003 05:07 PM

Well I checked the farnell site with no luck.Any ideas? :(

**idlefaction** · 09-14-2003 07:47 PM

the 5M is not an audio critical pot as far as i can tell, so you *could* buy a bunch of 1M or 2M or whatever you can get hold of pots, take them to bits, and sand the trace down with steel wool until it measures right! :D (i say a few cos you'd probably munt some figuring out how to do it)

now *that* would be DIY. not necessarily accurate scale, but definately DIY. they'd probably need to be like those 16mm or 24mm non-sealed ones.

[img]graemlins/beerchug.gif[/img]

**liron** · 09-14-2003 09:27 PM

thank for your replies!
kev, i couldn't find the info bout the VU meters in your page, but i have these meters and i don't want to burn it accidentally, how to protect them?
thankyou
ezequiel

**Steffen** · 09-15-2003 12:20 AM

what about buying a stereo 2,2 M pot and wire the 2 sections in series?

steffen

gyraf · 09-15-2003 02:07 AM

Steffen,

That is a very good idea!

Jakob E.

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