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Re: [Amps] Drake amplifier

To: <>
Subject: Re: [Amps] Drake amplifier
From: "Mark Hill" <>
Date: Mon, 23 Jul 2007 22:26:33 +0100
List-post: <>

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.



-----Original Message-----
From: [] On
Behalf Of Gary Schafer
Sent: 23 July 2007 17:21
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

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.

Gary  K4FMX

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