[EICO] 730 Modulator Question

[Paul Kraemer]

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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