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@yahoo.com>
Sent: Oct 26, 2005 7:05 PM
To: Amps <amps@contesting.com>
Subject: Re: [Amps] 3-500z
I'll capture all available data and let you know.
Joe
jsb@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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