> When the unit is powered up the primary fuses blow once the HV switch is
> enabled. The filament power appears to be ok. I have removed the tubes and
>
> ruled out any kind of tube short. It appears that if the amp is stone
> cold,
> there is a slight delay before the buzz and blown fuse event takes place
> when
> the HV switch is thrown. Once it is warm, it trips right away. I did some
> simple troubleshooting, and there appears to be no short of any kind on
> the
> HV line (with the Ip meter disconnected, otherwise it gets in the way of
> checking to ground). The only thing I could not confirm was the two solid
> state rectifiers. When measuring from the base to the anode, I get an open
>
> reading in both directions. Is there a way to test these that I am not
> aware
> of?
::You'd need a "Megger" (which generates substantial voltage to
measure resistance) to check these...they use a lot of junctions in series
and have too high a Vf (forward voltage drop) to be measured with a
conventional VOM that only delivers a few volts to the device being
measured. However, the fact that they read "open" and not "shorted" would
seem to indicate these are not what are blowing the fuses!
-WB2WIK/6
> What kind of reading should I expect when checking them? Could they be
> the culprit?
>
> Also, while the choke appears good, could it be failing once under load
> (powered up)?
>
>
> TIA,
>
> Eric
> KK2ED
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