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Old February 17th 04, 09:17 PM
Mike Knudsen
 
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Yet another question (sorry), about the HQ-160's slot filter circuit.
Given the schematic, should there be B+ up on the slot filter assembly on the
front panel, on the cable's center conductor? I have plenty of it there.

The schematic, no matter how cross-eyed I look at it, shows that every path B+
could take to the slot assembly is blocked by a cap. But I measure nearly 200V
on the cetner-tapped inductor under the chassis, the slot depth pot, and the
cable feed to the assembly.

I wonder if I have a shorted cap inside T3. However, both top and bottom slugs
of T3 are tunable. Maybe one of the .01 disk caps under the chassis is
shorted?

FWIW, the two caps on the assembly are keeping the B+ off the coil itself.
Also, shorting out the cable to ground thru a separate cap does not affect
anything.

Tnx, Mike K. AA1UK


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