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Author Topic: amp blowing the fuse  (Read 1839 times)
KP4RE
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Posts: 41




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« on: January 16, 2012, 07:26:29 PM »

I have an old amp,Frontier electronics Super 3000LA, the other day it blew the fuse, all capacitorsa and diode are ok.
the tubes are 4 6lf6 and are working ok, i put them in my other amp and are working fine, but the amp still blowing the fuse,any hepl?
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K8AXW
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Posts: 4002




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« Reply #1 on: January 16, 2012, 08:42:15 PM »

Divide and conquer!  Remove the tubes and power it up.  If it still blows fuses there's a 90% chance it is in the power supply.  Again, divide and conquer.  Pull the HV leads from the filter section and power it up again.  If it blows fuses, then chances are it's the power transformer.  If it's OK this way then it's in the filter section. 

If the filter caps are old, then you will probably need to replace them.  They might check OK with an ohmmeter but with HV they crap out. 

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KP4RE
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« Reply #2 on: January 16, 2012, 10:12:43 PM »

the tubes were remove but still blow the fuse, i will remove the leads from hv and let you know.
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K8AXW
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Posts: 4002




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« Reply #3 on: January 17, 2012, 08:19:06 AM »

Be very careful!  I hope you have taken the time to REALLY look over the power supply/filter cap/diode assembly looking for arc traces, bulging caps, etc.

Always use a very strong light and magnifying lens if possible.
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