[Amps] Alpha 77D anode choke swap?

Gary Schafer garyschafer at largeriver.net
Wed Apr 18 22:38:31 EDT 2018

With a low value choke it will parallel resonate by using some of the plate
tuning capacitance. 

Gary  K4FMX

> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Rob
> Atkinson
> Sent: Monday, April 16, 2018 8:06 AM
> To: amps at 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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