>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.
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
FAQ on WWW: http://www.contesting.com/FAQ/amps
Administrative requests: amps-REQUEST@contesting.com