[Amps] Plate Choke Resonances

[Gary Schafer]

Maybe Bill could explain to us how there is going to be more voltage
appearing across the plate choke than there is across the tank circuit which
is in parallel with the choke. :>)

73
Gary  K4FMX

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
> On Behalf Of Bill, W6WRT
> Sent: Sunday, January 31, 2010 8:12 PM
> To: Amps reflector
> Subject: Re: [Amps] Plate Choke Resonances
> 
> ORIGINAL MESSAGE:
> 
> On Sun, 31 Jan 2010 09:33:56 -0700, Larry Benko <xxw0qe at comcast.net>
> wrote:
> 
> >This forum should be about increasing knowledge rather than telling
> >people how they just never experienced some magical event that is too
> >complicated to simulate.
> 
> REPLY:
> 
> Well if the Tesla effect is too complicated for you to simulate, how
> about doing it in real life?
> 
> 1. Tune up your amp at full power into an antenna or dummy load.
> Measure the peak RF at the tube anode or input to the tank circuit.
> The peak RF should be approximately equal to the value of the DC anode
> voltage.
> 
> 2. Unplug the antenna and keep the drive the same. Measure the peak RF
> again. Hopefully it won't destroy your meter or burn up something in
> your amp.
> 
> You have just observed the Tesla effect - a peak voltage that is far
> higher than the DC input would normally produce. It is caused when a
> parallel resonant tank circuit which is lightly loaded accumulates
> very large amounts of energy due to the so-called "flywheel effect".
> This condition is common during the tune-up of an amplifier, before
> you reach the final fully loaded condition. This is when the RF choke,
> if parallel resonant, is most likely to smoke.
> 
> 4. I am sorry your software can not simulate this. Perhaps there is an
> upgrade available?  :-)
> 
> 73, Bill W6WRT
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