[Amps] 3-500z

Wed Oct 26 21:01:11 EDT 2005

Hello Amp Fans:

Here are the Eimac Specs for the old 500 watt dissipation version, the newer graphite plates have 600 watts dissipation.  The older tubes were lower mu than the newer tubes.  There is data here for up to 3,500 Volts, some amps run higher plate current:

RADIO FREQUENCY LINEAR AMPLIFIER

CATHODE DRIVEN

(Frequencies to 110 MHz)
Class AB2 

MAXIMUM RATINGS: DC PLATE VOLTAGE 4 000 VOLTS 
DC PLATECURRENT 0.4 AMPERE 
PLATE DISSIPATION 500 WATTS 
GRID DISSIPATION 20 WATTS 

Zener diode positive bias used at plate potentials of 3 kV and above 

Approximate value 

Currents listed correspond to SSB, or "Two-tone" average current at peak of signal envelope 

Single-tone current for 3500 Vdc operation may reach this value during short periods of circuit adjustment only 

Intermodulation distortion products are referenced against one tone of a two tone signal 

TYPICAL OPERATION
Class AB2, Peak Envelope or Modulation Crest Conditions

 PlateVoltage 1500 2000 2500 3000 3500 Vdc 
Cathode Voltage1 0 0 0 +10 +15 Vdc 
Zero Signal Plate Current2 65 95 130 62 53 mAdc 
Single-Tone Plate Current, CW3 4 400 400 400 400 400 mAdc 
Two-Tone PIate Current 260 270 280 268 262 mAdc 
Single-Tone Grid Current2 130 130 120 108 108 mAdc 
Two-Tone Grid Current2 80 80 70 60 58 mAdc 
Single-Tone Power Input 600 800 1000 1200 1400 W 
Useful Output Power CW or PEP 330 500 600 740 890 W 
Resonant Load Impedance 1600 2750 3450 4200 5000   
Intermodulation Distortion Products5             
3rd Order -46 -38 -33 -40 -40 db 
5th Order - - - -46 -45 db 
Driving Impedance 94 102 100 115 115   
Maximum Signal Driving Power2 49 49 46 46 46 W 

73 and Happy Dxing,

Mike
WB2AJI

-----Original Message-----
From: Joe Isabella <n3ji at yahoo.com>
Sent: Oct 26, 2005 7:05 PM
To: Amps <amps at contesting.com>
Subject: Re: [Amps] 3-500z

I'll capture all available data and let you know.

Joe

jsb at digistar.com wrote:
On Wed, 26 Oct 2005, Joe Isabella wrote:

> Absolutely. My Henry 3K-A is spec'ed at 2000W PEP Output right in the
> manual. It has ~4000V unloaded (3750 or so loaded) on the plates.
> With the fresh RF Parts ZGs, I got every bit of that with 100W drive.
> The amp is specified up to 150W drive, which my new rig will do, but I
> haven't tested it yet. I will this weekend and let you know (into a
> dummy load, of course).

curious... what's the grid current at that amount of output power? Those
tubes must have some kind of grids!

--
73 Jason N1SU
http://n1su.us/

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