[HAM] [Fwd: Blo en Blowjobs on fuses]

[Charles Buckingham]

I received this post via private e-mail.  I'm just passing it along as 
per the request of the writer: benjaminmassy at hotmail.com

Regards,

Charles


Reading your comments on Hammond fuses , slow blow fuse is usually 
filled with a retarding stuff , mostly fine sand and they do what it 
says : they retard a litle bit  the blowing if there is an overflow of 
current in cases like filling up capacitors from semiconductor diodes ( 
with low inner resistance diodes ,so provoking high surge currents for 
small moments .. milliseconds !

Under these circumstances would a 'fast 'or just 'normal' fuse possibly 
blow .. further are both fuses the same ,, they will blow if a continues 
over current situation will remain and this will happen faster if the 
current is proportiannally bigger; for instance : a fuse of 1 amp will 
blow after a long time being exposed to an average of 1.1 or 1.2 amps , 
but will blow instantly if 5 amps is going throug it  ; the 'slow' 
blower might tolerate some milliseconds the 5 amps but will also blow if 
this current wants to stay on for longer time then some milliseconds ( 
usually the short time to fill up capacitors to their average working 
voltage

these fenomen happens mostly when people are changing or bridging high 
tension (worn out )tube or valve diodes like the GZ34 for semiconductors 
like the 1n4007 series ... AND FORGET TO PUT A SERIES RESISTOR IN THE 
CIRCUIT TO STOP THE OVERCURRENT WHEN SWITCHING THE UNITS ON ! 

You can also substitute the SLOWBLO fuse by a certain resistor of 
certain wattage and resistance value that also will burn out if there is 
a shortcicuit or in  an 'over'current condition example: 1 Watts 
resistor from 1 ohm will take continuous 1 amp without problems and it 
could withstand 2 amps for certain time but then, you will start to 
smell something is wrong ;  if a short is present in the circuit  it 
would instantly blow out and give you the typicul burnt resistor smell 
.. this is for blind people interesting , they can't see the blown fuse 
but they can smell the burntout resistor  :-))

now don't lough, a blind musician would notice something's going wrong 
with his B3 , smelling burning resistors instead of pure Hammond oil

Greetz from a Hammond Freak that can repair them but don't know shit 
about playing them .

I can not enter  the Hammond forum for whatever reason I don't know , 
but maybe you could send in this  topic as some help for other ' would 
be technicians '

 :-))  Best regards from Belgium , Benjamin

 



 




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