|[AMRadio] 2 Meg Multiplier Oddity|
w5jo at brightok.net
Mon Feb 14 12:50:44 EST 2005
This type of construction of resistors and even capacitors is common in the
old radios of the 20s and 30s.
----- Original Message -----
From: "Merz Donald S" <merz.ds at mellon.com>
To: "'Amradio (E-mail)" <amradio at mailman.qth.net>; "'Glowbugs (E-mail)"
<glowbugs at piobaire.mines.uidaho.edu>
Sent: Monday, February 14, 2005 11:27 AM
Subject: [AMRadio] 2 Meg Multiplier Oddity
> Yesterday, I was replacing a 2 megohm meter multiplier that seemed to have
> failed. It was a single large-bodied resistor stamped "2M 3.5W". I get it
> unsoldered and it falls apart in my hands--a cardboard tube with two
> 2-watt, 1 megohm resistors soldered together in the middle. From the
> outside, you could not tell that this was 2 resistors in series. It was
> the connection between them that had failed.
> Very strange.
> In replacing this, I was trying to use some resistors from my stock of old
> ex-mil surplus types. These are usually painted brown and stamped with
> some specific value--like 681K--on them. Some of these have a construction
> that has metal end caps attached to the hard body of the resistor (not
> sure what the body is made of). In many cases, I discovered that when
> these metal end caps were just gently tugged , they came right off.
> Clearly, this is another component design that was not engineered to last
> 50 years.
> 73, Don Merz, N3RHT
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