Try a cooling fan on the powersupply. Worked for me..
Thanks,
Dudley
----- Original Message -----
From: "GW4BLE" <GW4BLE@btinternet.com>
To: <amps@contesting.com>
Sent: Sunday, September 07, 2003 8:57 AM
Subject: [Amps] Drake L7 & L4 Query....
> Hello,
>
> Could someone confirm please if the L-7 PSU is an *exact* replacement for
> the L-4 PSU?
>
> I am particularly interested if the transformer is the same ?
>
> When running an L7 amp (with L-7 PSU) in the "SSB" position there's a
> *very* loud BUZZZZ from the transformer after about 20 minutes or so.
>
> Using an L-4 PSU it's fine.
>
>
> Thanks
>
>
> Steve
>
>
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