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[AMPS] Swan has Big Bang !!! ??????

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Subject: [AMPS] Swan has Big Bang !!! ??????
From: (2)
Date: Sat, 7 Jul 2001 03:24:29 -0700
>Well after 30+ years my Swan MK 6 finally died, WITH A BIG BANG !!
>I thought I would run my repair plan by the group to make sure I don't 
>miss anything. If you want to look at the schematic it's here.
>The amplifier had been turned on for about an hour and used to make 1
>qso about 45 minutes before it blew. KL7N0 a weak double hop E's
>signal from Al in Fairbanks.
>After first inspection the following damage can be seen visually.
>In the power supply 4 of the equalizing resistors are charred and part
>of each is burnt away. These are all in the same leg of the voltage
>doubler.  Nothing found bad in the RF deck. The 4 amp fuse in the 
>negative lead is not blown, one of the Primary fuses blown.
>Plan of attack to repair the failure.
>1. Check each of the capacitors in the HV supply. 
> ... ... . . .
If any of the pressure vents have white deposits, all the electrolytic 
caps. should be replaced.  I would also replace the equalizer resistors 
with 100k-ohm 3w MOF type.  

cheers, Art.

-  R. L. Measures, 805.386.3734,AG6K,  

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