From n4tl2 at yahoo.com  Tue Apr  3 10:59:57 2018
From: n4tl2 at yahoo.com (Tom Lewis)
Date: Tue, 3 Apr 2018 14:59:57 +0000 (UTC)
Subject: [EICO] EICO 753
References: <648261960.1095649.1522767597167.ref@mail.yahoo.com>
Message-ID: <648261960.1095649.1522767597167@mail.yahoo.com>

Hello,
I wonder if this group is still active.
I have been working on an EICO 753.? I have it receiving okay. The S meter circuit is not working correctly and that is next.
73 tom N4TL 


From wb0poq at visi.com  Tue Apr  3 11:28:35 2018
From: wb0poq at visi.com (Bob Liesenfeld)
Date: Tue, 03 Apr 2018 10:28:35 -0500
Subject: [EICO] EICO 753
In-Reply-To: <648261960.1095649.1522767597167@mail.yahoo.com>
References: <648261960.1095649.1522767597167.ref@mail.yahoo.com>
	<648261960.1095649.1522767597167@mail.yahoo.com>
Message-ID: <web-9732583@mailback2.g2host.com>

Hi Tom,
? Looks to be working.? Good luck with the S meter.

Bob? WB0POQ

On Tue, 3 Apr 2018 14:59:57 +0000 (UTC)
 Tom Lewis via EICO <eico at mailman.qth.net> wrote:
>Hello,
>I wonder if this group is still active.
>I have been working on an EICO 753.? I have it receiving okay. The S meter circuit is not working correctly and that is next.
>73 tom N4TL 
>
>______________________________________________________________
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>Please help support this email list: http://www.qsl.net/donate.html


From gharmon at idworld.net  Thu Apr 19 12:56:06 2018
From: gharmon at idworld.net (Gary H. Harmon, Jr.)
Date: Thu, 19 Apr 2018 11:56:06 -0500
Subject: [EICO] 730 Modulator Question
Message-ID: <assp.064706cb94.000301d3d7ff$4f7d4b40$ee77e1c0$@idworld.net>

All the tube filaments are connected together with twisted wire.  The last
tube in the line has 640 ohm resistors from the two connections to ground.
WHY?  Curious minds want to know.

 

Thanks and 73,

 

Gary H. Harmon, Jr. - K5JWK - HAM Radio and ATARI Archaeologist

6003 Archwood

San Antonio, TX 78239-1504

(210) 657-1549 <home>

(210) 884-6926 <cell and text>

(210) 657-1549 <FAX with prior notification>

gharmon at idworld.net

 

"Retirement = Every day is a Saturday except Sunday"

http://www.grissomroadcoc.org

 


From elespe at lisco.com  Thu Apr 19 13:02:22 2018
From: elespe at lisco.com (Paul Kraemer)
Date: Thu, 19 Apr 2018 12:02:22 -0500
Subject: [EICO] 730 Modulator Question
In-Reply-To: <assp.064706cb94.000301d3d7ff$4f7d4b40$ee77e1c0$@idworld.net>
References: <assp.064706cb94.000301d3d7ff$4f7d4b40$ee77e1c0$@idworld.net>
Message-ID: <A1B1AD2A75864F22A52D9AE99FAA2B32@PaulKraemerPC>

Frequently done in lieu of filament winding having a center tap which was 
connected to ground.
Simple as that!  Sometimes the two resistors were in the form of a wirewound 
potentiometer with wiper grounded and called a hum bucking adjustment.
The wires are twisted to cancel hum as well
Paul K0UYA


-----Original Message----- 
From: Gary H. Harmon, Jr.
Sent: Thursday, April 19, 2018 11:56 AM
To: EICO
Subject: [EICO] 730 Modulator Question

All the tube filaments are connected together with twisted wire.  The last
tube in the line has 640 ohm resistors from the two connections to ground.
WHY?  Curious minds want to know.



Thanks and 73,



Gary H. Harmon, Jr. - K5JWK - HAM Radio and ATARI Archaeologist

6003 Archwood

San Antonio, TX 78239-1504

(210) 657-1549 <home>

(210) 884-6926 <cell and text>

(210) 657-1549 <FAX with prior notification>

gharmon at idworld.net



"Retirement = Every day is a Saturday except Sunday"

http://www.grissomroadcoc.org



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From wn2ami at gmail.com  Sun Apr 22 16:33:29 2018
From: wn2ami at gmail.com (Rj Mattson)
Date: Sun, 22 Apr 2018 16:33:29 -0400
Subject: [EICO] EICO 953B Cap tester manual.
Message-ID: <CAJsCO2gOAdV6O-9+4GFb=RMmgGFiDtL68THM3OxBrfe5T819Dw@mail.gmail.com>

Need an EICO  953B manual in PDF.please.
sendto wn2ami at gmail dot com ok.
Checked bama and googled - NG.
Be well,
bob...w2ami x wn2ami 1962