You guys have had the answer everytime so far. I bought a 2nd hand Ameritron
811H amp. It has worked very well exept .. at first start up serveral weeks
ago.. after it had been stored when i first turned it on it arec at the vents
9right side) switched it off.. long story short after a few turn ons and off it
work great.. I get good ooutpit and great reports. Well over the past few weeks
once in a while (only when I turn it on) I woud get an arc same place. after it
has been on and after serveral times on and off during the day it would be fine
great output and no arc even when switched back on .. seemed like only would do
it after it had been off all night and then only sometimes.. I have remoed and
check for any signs of arc etc never found anythign..
Well until today.. I switched it on.. and again a little arc that was visable
at the vents.. and quickly this time a loud pop.
Well obviously not a good thing. I remove the cover again and this time found
that one of the 53 ohm 2 watt resistors had actuall blew apart. onone end. I
shoudl mention that this time I had very little power out after the arc/bang..
In reviewing the circuit I can ot tell what these four resistors are but I
assume it has to do with some type of bleeder circuit to grd as all four have
one log to grd the other to a small wire maybe 18 ga. (light wires.. one is
yellow one is blue and the other two are red..
the yellow one is the one that blew the resistor...
The diagram they provide in the book and the parts list has to be incomplete as
the 53 ohn resitors are nto even liosted. there are two physically near the
rear of the tube cage (just to the rear to the torrid) the other two are near
the front edge of the same are... the yellow wired resistor that blew is one of
the two at the rear side of the tube cage..
Any ideas? Are these bleeder circuits ? part of the neutralization circuit? ..
Any ideas what might of caused this .. this amp sat for about 3 yrs in a closet
not used.. before I got it..
any ideas woud be of help. Could a tube of caused it? what else shoudl I check
thanks
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