[TenTec] Centurion is on the Fritz

[Mike Schatzberg]

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 at 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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