[Amps] Drake L-4B PSU burned resistor

[Steve Thompson]

R. Measures wrote:
> 

>> Vishay do a 'bolt down' 50W resistor which lists:
>> Dielectric strength 3500V rms
>> Limiting ekement voltage 1285V rms
>> Maximum overload voltage 2500V rms
> 
> 
> Sounds adequate to me for typical Ham amps.   However, my experience 
> with bolt down resistors is that they act not unlike a double ended 
> cannon during failure.
Yes, I've had that happen with the ones built into an extruded aluminium 
casing. The Vishay ones I was looking at are flat, with a moulded 
covering. I imagine that the resistive element is a film on ceramic, 
which is then bonded to a metal carrier. If there's any shrapnel, it's 
likely to be smaller pieces, and lower velocity.

Steve