[Amps] Henry 2KD-5 120 Hz Hum

[Leigh S. Jones, KR6X]

OK, Rich, my experience is generally with the floor mounted Henry 2K-2/2K-3 
series.  In fact, I have an Elect Corp of America P/N ECA 502C choke sitting 
on the floor at my right.  Your statement would suggest that the hamguy2 
problem lies elsewhere.  Any suggestions?

----- Original Message ----- 
From: "R L Measures" <r at somis.org>
To: "Leigh S. Jones, KR6X" <kr6x at kr6x.com>
Cc: <amps at contesting.com>
Sent: Monday, August 07, 2006 5:58 AM
Subject: Re: [Amps] Henry 2KD-5 120 Hz Hum


> 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 at fuse.net>
>> To: <amps at 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
>>> ----------------------
>>>
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>
> R L MEASURES, AG6K. 805-386-3734
> r at somis.org
>
>