[Amps] 2 X 3-500Z's and Plate Voltage Choice

[R.Measures]

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 at contesting.com 
>> [mailto:amps-bounces at 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 at 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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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org