Sb-301

[Bob And Bettina Groh]

Don't know about the quick and easy but one thing you will have to watch 
is the type of fuse you use if on the HV secondary. The normal 3AG glass 
fuses are only rated for a (?) 125 VAC. There are ceramic cased versions 
which I think were intended for higher voltage service. To set  the fuse 
rating, you would want to:
1.    Find out the maximum RMS current that you will be pulling
2.    Look on the Internet or some othe source for some manufacturer's 
data sheets and, most particularily, the current/time curves.  Then you 
find a fuse which will 'hold' the current you want for infinite time 
with some safety fudge (say 50%) but not too much!

The light bulb - hummm.  Don't know about that.  Same problem with 
voltage rating.

73
Bob, WA2CKY

Chris Campbell wrote:

> Bob And Bettina Groh wrote:
>
>> Chris,
>>
>>   Hopefully the 'smoke' is from an overheated (and failed) 
>> electrolytic and not a nuked power transformer (which failed because 
>> of a bad electrolytic). If the former, you should be able to replace 
>> the cap(s) [more later] - if the latter, you are probably left with a 
>> parts rig as power transformers are hard to find.
>>
>>
> This is a question from a different Chris.  I recall reading somewhere 
> about fusing the HV secondary of  power transformers on tube 
> equipment, to protect against filter capacitor failure.  There must be 
> some quick'n'easy way to calculate the size of the fuse for various 
> applications, but for some reason I'm drawing a mental blank right now.
>
> I also recall seeing somebody suggest placing a standard small lamp on 
> the CT of the secondary, to serve as a fuse.
> Does anybody have suggestions for either one?
>
> Chris Campbell
>
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