On Aug 10, 2005, at 7:08 AM, Phil Clements wrote:
> What is needed is the anode current required for these big claims of
> QRO on
> the 500Z. This will give us an idea of how many tubes you are going
> through,
> and how often!
Good point, Phil. The linear-region peak emission for a 3-400Z or
3-500Z is around 1250 mA. However, operating above this level is
likely to cause more rotten splatter than ruined cathodes.
>
> (((73)))
> Phil, K5PC
>
>
>> -----Original Message-----
>> From: amps-bounces@contesting.com
>> [mailto:amps-bounces@contesting.com] On
>> Behalf Of Joe Isabella
>> Sent: Tuesday, August 09, 2005 10:46 AM
>> To: Amps
>> Subject: Re: [Amps] 2 X 3-500Z's and Plate Voltage Choice
>>
>> Steve,
>> That's what my Henry runs (4kV SSB/3kV CW, no load). Under load, it
>> drops
>> to something like 2800 & 3700.
>>
>> And I've seen over 2k with just over 100W input. I now have a rig
>> that
>> will drive it with 150W, but I have yet to try it. I can send you
>> some
>> pics of the amp's HV meter & RF Applications VFD power meter, if you
>> like.
>> I have no doubts that the tube is good for 1kW each (ask Ameritron
>> about
>> their AL-80B).
>>
>> Joe, N3JI
>>
>> sccook1@cox.net wrote:
>> Morning all,
>>
>> Was thinking about upgrading my Henry 2K-4 to a 4A configuration with
>> the
>> CW/SSB switch. Was also thinking about puting in a transformer with
>> two
>> secondary voltages. I have seen amps running a pair of 3-500Zs with
>> all
>> kind of plate voltage schemes -- some running CW plate voltage as low
>> as
>> 2100 V no-load and as high as 4KV for SSB no-load.
>>
>> What would be a suitable voltage to shoot for for CW and SSB?
>> 3000/4000?
>> Less / More?
>>
>> Your thoughts?
>>
>> Steve (WG7K)
>>
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>
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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