Gary Schafer wrote:
> 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. :>)
>
IIRC the P-P should be twice the DC voltage at full load, but unloaded
it can become quite a bit more.
73
Roger (K8RI)
> 73
> Gary K4FMX
>
>
>> -----Original Message-----
>> From: amps-bounces@contesting.com [mailto:amps-bounces@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@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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>>
>
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