[Heathkit] AT-1 Problems

john johnmb at nc.rr.com
Wed Feb 22 17:55:45 EST 2006


What's the plate voltage doing while you're watching the plate current drop?
John


At 05:22 PM 2/22/2006, BFetters at aol.com wrote:
>AT-1 has very low output on 80/40, maybe 5 watts into a dummy load.  No
>output on 10/20.  Cannot dip on higher bands.
>
>Checked tubes.  Deoxited all contacts.  Recapped all caps in the oscillator
>and final circuits.  Resistors seem to be reasonably close to stated
>resistance.  Did not replace caps on the four band coils.
>
>Get decent grid drive on lower bands, not much on higher bands.  When key is
>held down on 80/40, plate current gradually creeps to 100 ma, and output goes
>to zero.
>
>Any thoughts/inputs?  Anyone have a chart listing normal voltages/resistances
>in the unit?
>
>Thanks.
>
>Buck W0RST
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