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Altec 436c EMI mods

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Heyhey   02-20-2005 at 05:05:12 PM

Archived from groups: rec.audio.pro (More info?)

 

What did EMI/Abbey Road do to modify their Altec 436 compressors back in the
sixties..
I saw some docs on ebay for 250 US dlrs(!)
Wasn't that complicated or what...?

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Anonymous   02-20-2005 at 05:05:13 PM
- 0 +

Archived from groups: rec.audio.pro (More info?)

 

heyhey wrote:
> What did EMI/Abbey Road do to modify their Altec 436 compressors back
in the
> sixties..
> I saw some docs on ebay for 250 US dlrs(!)
> Wasn't that complicated or what...?

$250 for some paper sounds extremely complicated to me! I was always
under the impression that Abbey Road pretty much gutted & rebuilt the
Altec's you see in the old pic's (while we watch all these Beatles
crazies still buying those green Altec's in droves, for "that" sound -
which isn't "that" sound at all!) Tee Hee!!!!

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Anonymous   02-20-2005 at 08:21:36 PM
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Archived from groups: rec.audio.pro (More info?)

 

On Sun, 20 Feb 2005 11:05:12 +0100, heyhey wrote:

> What did EMI/Abbey Road do to modify their Altec 436 compressors back in the
> sixties..
> I saw some docs on ebay for 250 US dlrs(!)
> Wasn't that complicated or what...?

I would imagine they put a trimmer on the bias of one side of both the
vari mu and output valve, so you can get rid of cv breakthrough. And
perhaps a variable attack.
I am no electronic engineer, but I built one and those were useful mods.

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Anonymous   02-21-2005 at 12:38:31 AM
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Archived from groups: rec.audio.pro (More info?)

 

Just curious, Jim. Have you ever done or are you familiar with any mods
for the Urei 175?

Mikey Wozniak
Nova Music Productions
this sig is haiku

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Anonymous   02-21-2005 at 10:36:37 PM
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Archived from groups: rec.audio.pro (More info?)

 

Sure, done several. The 176 has the variable attack/release with a
ratio switch. This can be added to the 175 if you can accept drilling
some holes in it. The audio mods consist of premium film signal caps
and some good tubes.

Jim Williams
Audio Upgrades
818-780-1222

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