The step start gizmo is a chicken brooder heater, still available in
rural supply stores.
On Tue, Sep 5, 2023 at 3:54 PM Steven Katz <stevek@jmr.com> wrote:
>
> Yeah, I wouldn’t do that. The Henry pedestal amps were well built and built
> to last, although the HV choke resonating cap is a failure point…usually
> after 20-30 years, not a year.
>
> I never had any problems with any of them, but never owned one for 30 years.
>
> The 4K Ultra was IMO the best amateur amp ever made by anybody but didn’t
> cover 160 meters, so that was its primary drawback. I had one for about ten
> years, zero problems and it was hard to keep it down to “legal limit.” 😊
>
> From: gudguyham@aol.com <gudguyham@aol.com>
> Sent: Tuesday, September 5, 2023 4:53 PM
> To: Steven Katz <stevek@jmr.com>; Rob Atkinson <ranchorobbo@gmail.com>;
> amps@contesting.com
> Subject: Re: [Amps] Subject: Henry hum on transmitted signal
>
> Steve, I won’t mention any names, but somebody bought quite a few Henry amps
> and stripped out the ENTIRE power supply guts, plate transformer , choke, HV
> cap, and the tuning caps even the wire would step start gizmo. Sold off all
> that stuff and put in a cap input supply using PD transformer like Ilona the
> big Ameritrons.
>
> Sent from the all new AOL app for
> iOS<https://apps.apple.com/us/app/aol-news-email-weather-video/id646100661>
>
>
> On Tuesday, September 5, 2023, 5:26 PM, Steven Katz
> <stevek@jmr.com<mailto:stevek@jmr.com>> wrote:
> Lou, I've seen that, too.
>
> I've also seen the resonating cap short out (choke is still fine) and B+ soar
> to 6kV and they just keep operating.
>
> Something will eventually fail, but those big oil-filled caps can often
> handle 6kV for quite a while, and so can the tubes in many cases.
>
> -----Original Message-----
> From: Amps <amps-bounces@contesting.com<mailto:amps-bounces@contesting.com>>
> On Behalf Of gudguyham--- via Amps
> Sent: Tuesday, September 5, 2023 4:24 PM
> To: Rob Atkinson <ranchorobbo@gmail.com<mailto:ranchorobbo@gmail.com>>;
> amps@contesting.com<mailto:amps@contesting.com>
> Subject: Re: [Amps] Subject: Henry hum on transmitted signal
>
> Rob, it seems as though is not “if” but “ when” the choke craps out in those
> Henry amps. I’ve seen where many chokes shorted to the core and guys mounted
> the choke on insulated material instead of getting a new one. Lou
>
>
> Sent from the all new AOL app for iOS
>
>
> On Tuesday, September 5, 2023, 7:14 AM, Rob Atkinson
> <ranchorobbo@gmail.com<mailto:ranchorobbo@gmail.com>> wrote:
>
> I think the resonant choke design is clever by a half. It's just too finicky
> and failure prone for my liking. Also, I've seen a choke Henry used in one
> of their amps, I forget which one but it was supposedly rated for 700 ma. I
> have a 700 ma filter choke out of a 1 KW broadcast rig intended to run
> continuously and it's at least twice as big and heavy as the dinky thing
> Henry used. I've seen I don't know how many RF power amplifiers designed for
> volatile loads like SSB and CW and they did fine with nothing but around 40
> mfd capacitance for a filter. I would only use a choke input for power
> supplies serving transmission modes that put the supply under continuous
> load, such as AM and RTTY. I would rebuild that power supply for whatever
> xmission mode is intended and ditch that resonant choke scheme.
>
> 73
>
> Rob
> K5UJ
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