[Hallicrafters] New resistor sizes

[Troglodite at aol.com]

We got the same answer when we questioned the metal film 1/4 watt resistors  
we ordered, and they looked the same as the 1/8 watt parts. However, I can 
tell  you that we tested them extensively and have had no problems. The heat  
dissipated is the same, so the smaller physical size gets a tiny bit hotter, but  
is no problem placed directly against the circuit board. We have since 
changed  the spacing on many of our boards since the new 1/4 watt parts are more 
compact.  We've used thousands with no problems. We still make a lot of hand 
stuffed  through hole boards.
 
Doug Moore
 
(Chief Engineer - Lowrey Organ Co.)
 
 
In a message dated 1/7/2009 10:37:17 A.M. Central Standard Time,  
daileyservices at qwest.net writes:

Recently, I ordered some replacement resistors from Mouser, and noticed  that 
the 1w devices were the size of what HAD been 1/4w, and 2w sizes were the  
same size of what HAD BEEN the 1/2w.  In correspondence with the Vischay  rep, 
this is what came out of their TechSupp folks.


Carbon  Composition Resistors (which are going obsolete) did not have a 
ceramic core and  were not as efficient at dissipating heat into the leads. By 
using metal film on  a ceramic core more power can be applied to a smaller part. 
By the same token  the large resistive area of the carbon composition resistor 
allowed for improved  pulse voltage handling characteristics than the ceramic 
core technology.
 
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