Gary,
Mine does a fairly comfortable 1 kW out (with 100 W drive), with the stock
Drake HV PSU (about 2.4 kV on load including the drop across the 50 Ohm
'glitch' resistor I added). Pity the designer(s) didn't put another 1000
Volt on the anode, but it seems there was no need in view of the power
limits at the time.
I imagine results might be influenced a little according to whether you have
done the mod. to properly ground the valve grids, or not. I haven't yet,
but soon will and will take a few 'before' and 'after' readings.
My amp. has RF Parts valves in.
Regards.
Mark.
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Gary Schafer
Sent: 23 July 2007 17:21
To: amps@contesting.com
Subject: [Amps] Drake amplifier
I have a drake L7 amp.
How much power out do you typically get from a drake L4 or L7 amp? I have 95
watts drive and get just short of 1100 watts on 40 meters.
The amp's wattmeter and a bird wattmeter with a brand new slug agree almost
exactly.
This seems a little low or is that about all that can be expected from the
3-500Z's. They run at 2450 volts on the plates and 230 ma grid current.
Thanks
Gary K4FMX
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