[amsat-bb] Re: Devices in Icom preamps AG-25 AG-35

George Henry ka3hsw at att.net
Wed Mar 17 20:54:41 PDT 2010

For the AG-35, it's a 2SK121Y.  Not sure about the AG-25.

As others have mentioned, because of the proximity of the relay, one of the 
easiest ways to replace it is to cut the leads on the old device, then bend 
& trim the leads on the new device to "straddle" the old leads & solder 
away.  Way easier than removing the relay...

George, KA3HSW

----- Original Message ----- 
From: "Mark L. Hammond" <marklhammond at gmail.com>
To: <amsat-bb at amsat.org>
Sent: Wednesday, March 17, 2010 5:29 PM
Subject: [amsat-bb] Devices in Icom preamps AG-25 AG-35

> Hello all,
> We either had two bad preamps to begin with, or they became casualties 
> during transport to K4T, but regardless--the Icom preamps we took appear 
> to have bad GAsFET devices in them.
> Can anybody tell me what is the device in each unit (AG-25 and AG-35)? 
> And are they something a skilled ham can reasonably replace?
> Specific suggestions for a parts source will be appreciated, too.
> 73,
> Mark L. Hammond  [N8MH]

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