[Amps] tube impedance, figuring tank circuit values

[Will Matney]

Gary,

Well, some books say "applied voltage". Matter of fact, I myself asked this same question on here a good while back. The answer I got from a regular on here was "peak everything". Look back in the archives and you'll find it most likely. It's kind of hard to guarantee what the voltage under load is going to be as I've seen it run from 11% to 15% regulation. The old rule of thumb of a 10% drop don't necessarily hold water because that has to do with how stout the transformer is. I myself always though it would have to be the voltage under load when I asked the same question. If you'll notice in the webpage I gave the link for he used 3000 Vdc which was the open circuit voltage in his design I'm pretty sure. So now, I'm back to square one myself unless it gets decided on here.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 3/31/06 at 11:21 AM Gary Patterson wrote:

>ok.... one guy says use the "open circuit voltage" the other guy say use
>the 
>loaded "operating voltage" ..................who is correct
>
>
>>From: "Phil Clements" <philc at texascellnet.com>
>>To: "'Partain, Chuck'" <Chuck_Partain at maxtor.com>,<amps at contesting.com>
>>Subject: Re: [Amps] tube impedance, figuring tank circuit values
>>Date: Thu, 30 Mar 2006 16:20:27 -0600
>>
>>
>> >
>> > So, when I power up my amp, I see 3910vdc on my plate. The way I have
>it
>> > configured, I put 330vdc on the screen grid
>> > and -130volts on the control grid., when I bring the control grid to 
>>-69v,
>> > the tube pulls current. The voltage on the plate is
>> > dropping to ~3600 to 3700. Is this the value I would use to figure the
>> > impedance of the tube for tank calculations?
>>
>>
>>No, the voltage and current of the amp when it is running at what you plan
>>to operate it at are the values that you plug into the formula. Say that 
>>the
>>voltage drops to 3500 volts at an operating anode current of 1 amp; your
>>tank should be configured for that, not the resting anode I.
>>
>>(((73)))
>>Phil, K5PC
>>
>>
>>
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