With a low value choke it will parallel resonate by using some of the plate
tuning capacitance.
73
Gary K4FMX
> -----Original Message-----
> From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Rob
> Atkinson
> Sent: Monday, April 16, 2018 8:06 AM
> To: amps@contesting.com
> Subject: Re: [Amps] Alpha 77D anode choke swap?
>
> >50 uh will also work just fine on 80-10m. A buddy uses a 50 uh choke
> on his
> >hb YC-156, which is a 80-10m amp.
>
>
> I have doubts about 50 microhenries being adequate for 80 m. Well, it
> might be okay if you used a tremendous amount of bypass capacitance
> but I'd prefer more inductance, less capacitance. A couple
> questions: How much bypass capacitance does your buddy use, and how
> much RF voltage is he willing to subject his power supply to? I'm
> assuming his filter is a bank of electrolytic caps.
>
>
> The best way to not have to sweat the h.v. power supply plate choke is
> to use a balanced output network with the choke in series with the
> center of the output network coil where the RF v. is already low.
>
>
> 73
>
> Rob
> K5UJ
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