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@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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