Start by making sure the bias is switching from cutoff. It doesn't sound like
it is.
If the switch is a relay you may hear it close. If it closes and you have no
idling current then perhaps you have lost the bias supply. Most likely this is
a switching issue since you are using zero bias tubes. With no running bias the
tubes will just show higher idle current and be drivable.
If you have EBC, then the switching doesn't require a relay. Not as easy to see
how the bias is switching without the cover off.
Check the QSK board schematic and see how the bias is switched and how it is
produced.
Mike
W2AJI
Sent from my iPhone
> On Oct 23, 2014, at 4:05 PM, Carter <k8vt@ameritech.net> wrote:
>
>> On 10/23/2014 1:54 PM, Richards wrote:
>> I have modest DIY sills and test equipment but I am game to try any
> > diagnostic test within my skill level. Any ideas?
>
> You've already mentioned this in another post, but it bears repeating:
>
> DANGER! HIGH VOLTAGE!! Do NOT use your VOM to attempt to measure the high
> voltage. Unless you have a special high voltage probe, it will vaporize.
>
> You could call Garry Green at the Mother Ship and run the symptoms by him. At
> one time I seem to recall him saying something about a QSK board failure
> under certain fault conditions.
>
> I'm not familiar with the K2 watt meter or how it "breaks the key line". You
> may want to disable/totally disconnect that feature and go directly into a
> dummy load.
>
> 73,
> Carter K8VT
>
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