[Amps] Glitch resistor + fuse?

[Jim W7RY]

I've never had a wire wound glitch resistor "fail" during normal operation.

10 watt or 25 watt, HV or 120/240 VAC.

73
Jim W7RY


-----Original Message----- 
From: John Lyles 
Sent: Thursday, November 16, 2017 12:40 AM 
To: amps at contesting.com 
Subject: [Amps] Glitch resistor + fuse? 

Maybe someone already covered this, but I stay away from using wirewound 
resistors for series energy limiters in tube power amplifiers. For one 
thing, when you are dumping 50 amps or more for a few uS, the magnetic 
field can cause the winding to fail. 10 ohm Kanthal Globar bulk carbon 
resistors are great for high peak power, in this application. You can 
find leaded ones, clip in ones, and other shapes. They are rated for 
very large voltage across them, momentarily, and have a high temperature 
rating. However, you have to pick the right one (AS or SP type) for the 
average DC current's power dissipation.

John
K5PRO
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