[Amps] Suggestions - I broke my amp

[Roger (K8RI)]

On 10/30/2010 11:34 PM, Larry wrote:
> I am looking for suggestions regarding my Clipperton-L. The basic problem is that there is
> no output. No apparent plate current.
>
Check the coax between the tank and the TR relay.  Back "in the days" I 
think that was the most often encountered problem.

Do you still have bias?

Those are the two that come to mind.

73

Roger (K8RI)
> I did several things:
>
> 1. I replaced the power supply board which seems to be working as the meter shows about
> 2500V (I don't have an HV probe to confirm independently that there is 2500V).
> 2. I had to fix the parasitic suppressors so I put in an AL572 RFC and suppressor board and
> increased the bypass cap to 0.001.
> 3. I changed the plate blocking cap to 2000pf (from 500pf) and changed a couple of doorknobs
> for 160. The no output has been checked only on 20 and 15 so far.
> 4. I changed the filament RFC to an RF Parts RFCFIL30.
>
> Some other facts:
>
> 1. The filaments are lit.
> 2. The meter shows what I recall as roughly the correct plate voltage.
> 3. Using an ohmmeter there is continuity from the PS HV pad to the plate connectors.
> 4. There is no plate current that I can see. Although, I once saw the plate current go to about
> 350mA and still no output.
> 5. Several years ago I added a tuned input board and there is continuity from the LVDC pad to
> input board and the bandswitch (unchanged in current mod but changed with the input board)
> still works correctly.
> 6. There is continuity from the plate to plate blocking capacitor and continuity from the "other"
> side of the plate blocking capacitor to the plate tuning capacitor.
> 7. I rechecked the connections and still think everything is correct.
> 8. No arcs, blown fuses, etc.
>
> I have obviously overlooked something. Suggestions?
>
> 73, Larry  W6NWS
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