Make sure the primary of the plate transformer is correctly wired for
the line voltage. For example, if the transformer is wired for 220 and
the line voltage is 250 (not uncommon), a nominal 3200V DC across the
caps could exceed 3600. The AL82 uses 8 450V capacitors in series for a
total of 3600V.
This gives you no safety factor. If the bleeder resistors and/or
capacitor values aren't evenly matched, some voltage ratings will be
exceeded.
On 24 Dec 2014 19:51, Bob Gibson via Amps wrote:
I'm having a problem with a friends al-1200 amp.. He is 80 years old
I'm 71 and we can not figure this out.. I have replaced the stock P/S
board twice.. after a short time it blows out.. I have replaced it
now with a WD7S HV board and again it blows the caps.. I have
replaced the step-start board with a W7RY board.. still samething.. I
headed back up to try to work on this thing again this weekend.. any
ideas would sure help out..Bob W5RG Almost 60 years in Ham Radio
--
73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/
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