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Re: [Amps] Drake L-7

To: "Max Cotton" <>, <>
Subject: Re: [Amps] Drake L-7
From: "Jim W7RY" <>
Date: Tue, 13 Feb 2018 07:50:44 -0600
List-post: <>
Don’t use ALC and remove the resistors. Also need to change the cutoff bias arrangement. Or add my QSK system. Search EBay for my call.

Jim W7RY

-----Original Message----- From: Max Cotton
Sent: Friday, February 09, 2018 2:01 PM
Subject: [Amps] Drake L-7

I have a Drake L7 with a Dahl higher voltage transformer inside the psu, now the 50k resistors get pretty hot and need to be swapped out, I calculate they should be approx 75k each giving 30W dissipation and the AGC resistor under the psu to 6k8 10w, however the AGC voltage will vary around 78 to 108V depending on CW or SSB settings, the manual states 120V but even with the original transformer they don't attain 120V. Anyone done this before to an L7 or L4? There is approximately a 10% increase in HT voltage.

73 Max M0GHQ
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