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[AMPS] SB-1000 mods?

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Subject: [AMPS] SB-1000 mods?
From: (2)
Date: Mon, 10 Sep 2001 11:33:27 -0700
>> In any case, the glitch resistor is one of those components that needs
>> to be located in a cooling air stream.
>> Any idea how to get hold of these resistors in small quantities  at
>> reasonable prices? Now it's Monday, is somebody gonna call 
>I'd suggest people check manufacturers. I'm sure many have stock 
>components that will do.
>For example, Ameritron has a variety of globar resistors and also a 
>400 joule 13 watt dissipation 1500 volt 10 ohm resistor as a 
>standard component. ... ... 

//  At one time, no Ameritron/MFJ amplifier used a glitch resistor.  
Which models currently do, Me. Rauch?
>The resistance actually needs to be selected by the ruggedness of 
>other components, not just by voltage. For example, a 4CX5000 
>can take a big current whack compared to frail small tube like a 

//  Amen to that.

>With the 4CX5000, your biggest worry is other 
>components like RF chokes and screen regulation systems.
A fast-acting 250v fuse in the power transformer's primary in the scrren 
supply seemingly took care of this matter in the "plywood-box".   The 
negative screen-current problem was addressed by bleeding 25mA of screen 
current with a 50w resistor.    

>I don't think X ohms per volt is a good rule, although I suppose it is 
>better than nothing.
//  Practical experience is often better than esoteric calculations.  

cheers, Tom

-  R. L. Measures, 805.386.3734, AG6K,  

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