[TechAssist] Re: EARTH Sound Research Mixer Amp
- From: "Technotronic Dimensions" <Steve@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 25 Jul 2003 11:57:12 -0400
Yep, 7641 is indeed a date Code. I am thinking these Semi's are made by
Siemens.
He Could try Posting this problem to Parts_Link as Well. We have a guy there
who would probably know if they are Siemens parts.
Steve Hearns
Technotronic Dimensions, NY (USA)
1-877-817-9885 (Voice / Fax US Only)
WWW.TECHNOTRONIC-DIMENSIONS.COM
----- Original Message -----
From: <Svatek227@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 25, 2003 11:21 AM
Subject: [TechAssist] Re: EARTH Sound Research Mixer Amp
> Gary,
> What's the Age of this unit? late 70's early 80's? if this is the case,
7641
> would be a date code ie manufactured in the 41st week of 1976 are there
any
> brand logos on the part? below is a link to a site that ID's brands by
logo <A HREF="http://www.chipdocs.com/index.html?okwd=59-4004B";>
> Click here: ChipDocs - Datasheets for Electronic Components and
Semiconductors</A>
>
> Joe Svatek
> Owner
> Svatek's Electronics
> 227 Marten St.
> Neenah,WI 54956-2520
> Phone: (920) 751-8937
> Fax : (920) 751-3727
> email: Svatek227@xxxxxxx
>
>
>
>
>
>
>
> In a message dated 7/25/2003 7:36:54 AM Central Daylight Time,
bec@xxxxxxxxx
> writes:
>
> > Does anyone have any information on a mixer amp made by a company called
> > Earth Sound Research. On the back of the unit it says POWER SYSTEM
EARTH Sound
> > Research, ISC Audio Inc. MODULE 340. It was made in Farmingdale, NY. I
am
> > needing information on the output transistors. The part number on them
is
> > 59-4004-B, below that number is 7641, they are TO-3 case and appear to
be NPN
> > silicon. I can't find any information on these and my educated guesses
have
> > not faired well either. Thanks in advance.
> > Gary Pahls
> > Beloit Entertainment Center
> > Beloit, KS
> >
>
>
>
>
>
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