The Henry 2KD-5 does not use a resonant-choke filter, it has a C filter.
On Aug 6, 2006, at 5:09 PM, Leigh S. Jones, KR6X wrote:
> Henry amplifiers use resonated chokes to achieve their normal high
> attenuation of HV power supply hum rejection. If the resonating
> capacitor
> has broken down, or if there has been a short across the turns of the
> inductor, the hum level would increase with a few attendant
> symptoms. The
> symptoms might include an increase in the unloaded plate voltage
> and reduced
> stability of the HV.
>
> ----- Original Message -----
> From: "hamguy2" <hamguy2@fuse.net>
> To: <amps@contesting.com>
> Sent: Sunday, August 06, 2006 11:56 AM
> Subject: [Amps] Henry 2KD-5 120 Hz Hum
>
>
>> I have a Henry 2KD-5 that I am using on AM running 300 watts.
>> There is a low level but noticeable 120 Hz hum on the unmodulated
>> carrier in CW mode. The hum is super imposed on the AM signal
>> amplitude. Local stations can hear the hum. I have tried two
>> exciters and they are not the source. I have recapped the filter
>> capacitors to 250 mF without change in symptoms.
>>
>> Is there something else to check or do I just live with the hum?
>>
>> ----------------------
>> Ron Schuster N9RC
>> ----------------------
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|